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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Roman Shpount <rshpount@turbobridge.com>
CC: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>, Alan Ford <alan.ford@gmail.com>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
Thread-Topic: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
Thread-Index: AQHS/tQqacZkSf+3+0+Qd13paCNRh6Jak8qAgBkj0wA=
Date: Thu, 3 Aug 2017 21:32:08 +0000
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References: <33AC90F8-1963-4F79-ACB2-0DB2873D5E34@cisco.com> <CAD5OKxswNRuYFt_XQZ=caDB5WQDXS27KbH3M-AxhKL9Pq0WwPA@mail.gmail.com>
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Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
CC: "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Roman Shpount <rshpount@turbobridge.com>, Alan Ford <alan.ford@gmail.com>, "Gonzalo Camarillo" <gonzalo.camarillo@ericsson.com>, "alan@pexip.com" <alan@pexip.com>
Thread-Topic: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis - Christer's review
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Date: Thu, 3 Aug 2017 21:56:41 +0000
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Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis - Christer's review
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Alan Ford <alan.ford@gmail.com>
CC: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Roman Shpount <rshpount@turbobridge.com>, "Gonzalo Camarillo" <Gonzalo.Camarillo@ericsson.com>, Christer Holmberg <christer.holmberg@ericsson.com>
Thread-Topic: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
Thread-Index: AQHS/tQqacZkSf+3+0+Qd13paCNRh6JbaakAgAYAO4CAElregA==
Date: Thu, 3 Aug 2017 22:19:12 +0000
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References: <33AC90F8-1963-4F79-ACB2-0DB2873D5E34@cisco.com> <CA9D5614-1425-4F8E-8B05-AFCEFBA65507@cisco.com> <F5575EC0-2762-46E6-A875-300895B7A268@gmail.com>
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Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
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Thread-Topic: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis - Christer's review
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Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis - Christer's review
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From: Alan Ford <alan.ford@gmail.com>
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Cc: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Roman Shpount <rshpount@turbobridge.com>, Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>, Christer Holmberg <christer.holmberg@ericsson.com>
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To: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
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Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
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Hi Charles, all,

Further comments inline=E2=80=A6

> On 3 Aug 2017, at 23:19, Charles Eckel (eckelcu) <eckelcu@cisco.com> =
wrote:
>=20
> Please see inline [cue]
> =20
> From: Alan Ford <alan.ford@gmail.com <mailto:alan.ford@gmail.com>>
> Date: Sunday, July 23, 2017 at 1:01 AM
> To: Charles Eckel <eckelcu@cisco.com <mailto:eckelcu@cisco.com>>
> Cc: "bfcpbis@ietf.org <mailto:bfcpbis@ietf.org>" <bfcpbis@ietf.org =
<mailto:bfcpbis@ietf.org>>, Tom Kristensen <tomkrist@cisco.com =
<mailto:tomkrist@cisco.com>>, Roman Shpount <rshpount@turbobridge.com =
<mailto:rshpount@turbobridge.com>>, Gonzalo Camarillo =
<Gonzalo.Camarillo@ericsson.com =
<mailto:Gonzalo.Camarillo@ericsson.com>>, Christer Holmberg =
<christer.holmberg@ericsson.com <mailto:christer.holmberg@ericsson.com>>
> Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
> =20
> Hi Charles, all,=20
> =20
> S3
> =20
> - TCP transport indent is hard to parse. Suggest changing sentence to =
"Depending on the value of the 'setup' attribute (discussed in Section =
8.1), the port field contains either the port to which the remote =
endpoint will direct BFCP messages, or in the case where the endpoint =
will initiate the connection towards the remote endpoint, should be set =
to a value of 9."
> =20
> [cue] works for me
> =20
> =20
> S4.1
> =20
> - "The offerer includes this attribute to state all the roles it would =
be willing to perform=E2=80=9D: add =E2=80=9Conce negotiation is =
complete=E2=80=9D, for clarity.
> =20
> [cue] good idea
> =20
> - Here, plus S11.1 and S11.2, floorctrl is optional with inferred =
state of c-only for an offerer if it is not specified. I would advocate =
taking this opportunity to get rid of ambiguity and making the presence =
of floorctrl a MUST. Everyone does it already, but it=E2=80=99s one of =
the most problematic fields for interop as it is.
> =20
> - Also, given in an answer only one role is present, but in an offer =
multiple can be present, can this be clearer in the ABNF? Is it possible =
to specify two ABNFs, one for the offer and one for the answer (the =
answer being without the *)? If that=E2=80=99s not possible, then could =
we at least emphasise this point near the start of the section (again =
coming at this from too many interop issues in this area).
> =20
> [cue] Christer seemed to agree with you. I have been a proponent of =
not breaking backward compatibility with RFC 4583 unnecessarily. Anyone =
from the original RFC 4583 days able to shed some light on this?

I agree with Christer here - it=E2=80=99s not a break in backward =
compatibility to mandate it from a offerer's point of view in the new =
spec, since this is all which is changing. An old answerer can cope. The =
only issue is a new-spec-compliant answerer with an old receiver. To be =
fully belt-and-braces here, the receiver should be able to cope without =
one and infer it, but the sender MUST always send it.

BTW just to flag up my second point there was unrelated to the first, =
which you answered=E2=80=A6 I=E2=80=99m not sure how best to present =
this information but I think it=E2=80=99s important it=E2=80=99s clearer =
near the ABNF definition that multiple roles are possible in an offer.


> S6
> =20
> - =E2=80=9C=E2=80=A6identified by an SDP label attribute=E2=80=9D. For =
consistency, please put =E2=80=98label=E2=80=99 in single quotes.
> =20
> [cue] good idea
> =20
> - Why is mstrm: optional in the ABNF, and optional in the paragraph =
beginning =E2=80=9CThe floorid attribute=E2=80=A6=E2=80=9D, yet is =
mandatory in the =E2=80=9CEndpoints that use the offer/answer=E2=80=A6=E2=80=
=9D section? If there is a genuine reason for it to be optional please =
specify this, however I think it would be easier just to make it =
mandatory.
> =20
> [cue] The floorid is defined such that one can specify a floorid yet =
not associate it with any media stream, thus the mstrm is optional. This =
is how it was defined in RFC 4583. I am not sure if anyone makes use of =
this, but that is how it was defined.

It would be useful to understand what the use case is for this, but =
whether or not it=E2=80=99s required the text is still inconsistent. "It =
defines a floor identifier and, possibly, associates it with one or more =
media streams.=E2=80=9D makes it sound optional, whereas "A floor =
control server acting as an offerer or as an answerer MUST include these =
attributes in its session descriptions.=E2=80=9D says =E2=80=9Cthese =
attributes=E2=80=9D which I took to mean both label and floorid, and =
once you=E2=80=99re including label the inference is that mstrm: should =
be added.

I think it would be beneficial to clarify one way or the other. Either =
mstrm: is a MUST, or clarify why and how it could be used optionally.



> =20
> S11
> =20
> Is is required to have a BUNDLE table like this now? (I presume given =
draft-ietf-mmusic-sdp-mux-attributes-16 is in MISSREF it=E2=80=99s too =
late to make the updates there). As Christer mentioned, It think this =
would be better in S7. OR, a separate subsection under S11 for =E2=80=9CBU=
NDLE Considerations=E2=80=9D that makes it clearer that this is an =
update to draft-ietf-mmusic-sdp-mux-attributes-16.
> =20
> [cue] agreed
> =20
> I assume we don=E2=80=99t want to go down the rabbit hole of defining =
BUNDLE for BFCP at this stage? :-)  Since if we did, it probably =
wouldn=E2=80=99t be too hard - you can demux on confid + userid.
> =20
> [cue] We decided previously to leave BUNDLE out of scope. I am happy =
to keep it that way.
> =20
> =20
> S14.2
> =20
> The =E2=80=9CAllowed attribute values=E2=80=9D here is inconsistent =
compared to others by being ABNF rather than just =E2=80=9CA token=E2=80=9D=
 or =E2=80=9CTokens=E2=80=9D. It=E2=80=99s also wrong - it implies only =
one value, not multiple as is the case. Suggest either fixing the ABNF =
or saying =E2=80=9Cone or more of=E2=80=A6=E2=80=9D or similar.
> =20
> [cue] This is how it was defined in RFC 4583. As I understand it, =
=E2=80=9C1*=E2=80=9D means it requires at least one, so can have =
multiple.
>=20

Quite right, brain fart :)

Regards,
Alan



--Apple-Mail=_E1F14111-9E10-4D3A-8A28-DB568DB35391
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Charles, all,<div class=3D""><br class=3D""></div><div =
class=3D"">Further comments inline=E2=80=A6</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
3 Aug 2017, at 23:19, Charles Eckel (eckelcu) &lt;<a =
href=3D"mailto:eckelcu@cisco.com" class=3D"">eckelcu@cisco.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);"><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Please see inline [cue]<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><b class=3D""><span style=3D"font-family: =
Calibri, sans-serif;" class=3D"">From:<span =
class=3D"Apple-converted-space">&nbsp;</span></span></b><span =
style=3D"font-family: Calibri, sans-serif;" class=3D"">Alan Ford &lt;<a =
href=3D"mailto:alan.ford@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">alan.ford@gmail.com</a>&gt;<br =
class=3D""><b class=3D"">Date:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>Sunday, July 23, 2017 =
at 1:01 AM<br class=3D""><b class=3D"">To:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>Charles Eckel &lt;<a =
href=3D"mailto:eckelcu@cisco.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">eckelcu@cisco.com</a>&gt;<br =
class=3D""><b class=3D"">Cc:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>"<a =
href=3D"mailto:bfcpbis@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">bfcpbis@ietf.org</a>" &lt;<a =
href=3D"mailto:bfcpbis@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">bfcpbis@ietf.org</a>&gt;, Tom =
Kristensen &lt;<a href=3D"mailto:tomkrist@cisco.com" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">tomkrist@cisco.com</a>&gt;, Roman Shpount &lt;<a =
href=3D"mailto:rshpount@turbobridge.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">rshpount@turbobridge.com</a>&gt;, =
Gonzalo Camarillo &lt;<a href=3D"mailto:Gonzalo.Camarillo@ericsson.com" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">Gonzalo.Camarillo@ericsson.com</a>&gt;, Christer Holmberg =
&lt;<a href=3D"mailto:christer.holmberg@ericsson.com" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">christer.holmberg@ericsson.com</a>&gt;<br class=3D""><b =
class=3D"">Subject:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>Re: [bfcpbis] WGLC for =
draft-ietf-bfcpbis-rfc4583bis<o:p class=3D""></o:p></span></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Hi Charles, all,<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">S3<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">- TCP transport indent is hard to parse. Suggest =
changing sentence to "Depending on the value of the 'setup' attribute =
(discussed in Section 8.1), the port field contains either the port to =
which the remote endpoint will direct BFCP messages, or in the case =
where the endpoint will initiate the connection towards the remote =
endpoint, should be set to a value of 9."<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">[cue] works for me<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">S4.1<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">- "The offerer includes this attribute to state all =
the roles it would be willing to perform=E2=80=9D: add =E2=80=9Conce =
negotiation is complete=E2=80=9D, for clarity.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">[cue] =
good idea<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">- Here, plus S11.1 and S11.2, floorctrl is optional =
with inferred state of c-only for an offerer if it is not specified. I =
would advocate taking this opportunity to get rid of ambiguity and =
making the presence of floorctrl a MUST. Everyone does it already, but =
it=E2=80=99s one of the most problematic fields for interop as it =
is.<o:p class=3D""></o:p></div></div><div class=3D""><div style=3D"margin:=
 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">- Also, given in an =
answer only one role is present, but in an offer multiple can be =
present, can this be clearer in the ABNF? Is it possible to specify two =
ABNFs, one for the offer and one for the answer (the answer being =
without the *)? If that=E2=80=99s not possible, then could we at least =
emphasise this point near the start of the section (again coming at this =
from too many interop issues in this area).<o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">[cue] =
Christer seemed to agree with you. I have been a proponent of not =
breaking backward compatibility with RFC 4583 unnecessarily. Anyone from =
the original RFC 4583 days able to shed some light on =
this?</div></div></div></div></blockquote><div><br class=3D""></div><div>I=
 agree with Christer here - it=E2=80=99s not a break in backward =
compatibility to mandate it from a offerer's point of view in the new =
spec, since this is all which is changing. An old answerer can cope. The =
only issue is a new-spec-compliant answerer with an old receiver. To be =
fully belt-and-braces here, the receiver should be able to cope without =
one and infer it, but the sender MUST always send it.</div><div><br =
class=3D""></div><div>BTW just to flag up my second point there was =
unrelated to the first, which you answered=E2=80=A6 I=E2=80=99m not sure =
how best to present this information but I think it=E2=80=99s important =
it=E2=80=99s clearer near the ABNF definition that multiple roles are =
possible in an offer.</div><div><br class=3D""></div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);"><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">S6<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">- =E2=80=9C=E2=80=A6identified by an SDP label =
attribute=E2=80=9D. For consistency, please put =E2=80=98label=E2=80=99 =
in single quotes.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">[cue] good idea<o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">- Why is mstrm: optional in the ABNF, and optional in =
the paragraph beginning =E2=80=9CThe floorid attribute=E2=80=A6=E2=80=9D, =
yet is mandatory in the =E2=80=9CEndpoints that use the =
offer/answer=E2=80=A6=E2=80=9D section? If there is a genuine reason for =
it to be optional please specify this, however I think it would be =
easier just to make it mandatory.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">[cue] The floorid is defined such that =
one can specify a floorid yet not associate it with any media stream, =
thus the mstrm is optional. This is how it was defined in RFC 4583. I am =
not sure if anyone makes use of this, but that is how it was =
defined.</div></div></div></blockquote><div><br class=3D""></div>It =
would be useful to understand what the use case is for this, but whether =
or not it=E2=80=99s required the text is still inconsistent. "It defines =
a floor identifier and, possibly, associates it with one or more media =
streams.=E2=80=9D makes it sound optional, whereas "A floor control =
server acting as an offerer or as an answerer MUST include these =
attributes in its session descriptions.=E2=80=9D says =E2=80=9Cthese =
attributes=E2=80=9D which I took to mean both label and floorid, and =
once you=E2=80=99re including label the inference is that mstrm: should =
be added.</div><div><br class=3D""></div><div>I think it would be =
beneficial to clarify one way or the other. Either mstrm: is a MUST, or =
clarify <i class=3D"">why and how</i>&nbsp;it could be used =
optionally.</div><div><div><br class=3D""></div><div><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);"><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">S11<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">Is is required to have a BUNDLE table like this now? =
(I presume given&nbsp;draft-ietf-mmusic-sdp-mux-attributes-16 is in =
MISSREF it=E2=80=99s too late to make the updates there). As Christer =
mentioned, It think this would be better in S7.<span =
class=3D"Apple-converted-space">&nbsp;</span><i class=3D"">OR</i>, a =
separate subsection under S11 for =E2=80=9CBUNDLE Considerations=E2=80=9D =
that makes it clearer that this is an update =
to&nbsp;draft-ietf-mmusic-sdp-mux-attributes-16.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">[cue] =
agreed<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I assume we don=E2=80=99t want to go down the rabbit =
hole of defining BUNDLE for BFCP at this stage? :-) &nbsp;Since if we =
did, it probably wouldn=E2=80=99t be too hard - you can demux on confid =
+ userid.<o:p class=3D""></o:p></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">[cue] We decided previously to leave BUNDLE out of scope. I =
am happy to keep it that way.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">S14.2<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">The =E2=80=9CAllowed attribute values=E2=80=
=9D here is inconsistent compared to others by being ABNF rather than =
just =E2=80=9CA token=E2=80=9D or =E2=80=9CTokens=E2=80=9D. It=E2=80=99s =
also wrong - it implies only one value, not multiple as is the case. =
Suggest either fixing the ABNF or saying =E2=80=9Cone or more of=E2=80=A6=E2=
=80=9D or similar.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">[cue] This is how it was defined in RFC =
4583. As I understand it, =E2=80=9C1*=E2=80=9D means it requires at =
least one, so can have multiple.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><br =
class=3D""></div></div></div></blockquote><br class=3D""></div><div>Quite =
right, brain fart :)</div><div><br =
class=3D""></div><div>Regards,</div><div>Alan</div><div><br =
class=3D""></div><br class=3D""></div></body></html>=

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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
CC: "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Roman Shpount <rshpount@turbobridge.com>, Alan Ford <alan.ford@gmail.com>, "Gonzalo Camarillo" <gonzalo.camarillo@ericsson.com>, "alan@pexip.com" <alan@pexip.com>
Thread-Topic: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis - Christer's review
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Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis - Christer's review
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Alan Ford <alan.ford@gmail.com>
CC: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Roman Shpount <rshpount@turbobridge.com>, "Gonzalo Camarillo" <Gonzalo.Camarillo@ericsson.com>, Christer Holmberg <christer.holmberg@ericsson.com>
Thread-Topic: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
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Date: Mon, 7 Aug 2017 18:56:51 +0000
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From: Alan Ford <alan.ford@gmail.com>
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Date: Tue, 8 Aug 2017 09:52:44 +0100
Cc: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Roman Shpount <rshpount@turbobridge.com>, Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>, Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
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Hi Charles, all,

Inline=E2=80=A6

> On 7 Aug 2017, at 19:56, Charles Eckel (eckelcu) <eckelcu@cisco.com> =
wrote:
>=20
> =20
> From: Alan Ford <alan.ford@gmail.com <mailto:alan.ford@gmail.com>>
> Date: Monday, August 7, 2017 at 1:37 AM
> To: Charles Eckel <eckelcu@cisco.com <mailto:eckelcu@cisco.com>>
> Cc: "bfcpbis@ietf.org <mailto:bfcpbis@ietf.org>" <bfcpbis@ietf.org =
<mailto:bfcpbis@ietf.org>>, Tom Kristensen <tomkrist@cisco.com =
<mailto:tomkrist@cisco.com>>, Roman Shpount <rshpount@turbobridge.com =
<mailto:rshpount@turbobridge.com>>, Gonzalo Camarillo =
<Gonzalo.Camarillo@ericsson.com =
<mailto:Gonzalo.Camarillo@ericsson.com>>, Christer Holmberg =
<christer.holmberg@ericsson.com <mailto:christer.holmberg@ericsson.com>>
> Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
> =20
> Hi Charles, all,=20
> =20
> Further comments inline=E2=80=A6
> =20
>> On 3 Aug 2017, at 23:19, Charles Eckel (eckelcu) <eckelcu@cisco.com =
<mailto:eckelcu@cisco.com>> wrote:
>> =20
>> Please see inline [cue]
>> =20
>> From: Alan Ford <alan.ford@gmail.com <mailto:alan.ford@gmail.com>>
>> Date: Sunday, July 23, 2017 at 1:01 AM
>> To: Charles Eckel <eckelcu@cisco.com <mailto:eckelcu@cisco.com>>
>> Cc: "bfcpbis@ietf.org <mailto:bfcpbis@ietf.org>" <bfcpbis@ietf.org =
<mailto:bfcpbis@ietf.org>>, Tom Kristensen <tomkrist@cisco.com =
<mailto:tomkrist@cisco.com>>, Roman Shpount <rshpount@turbobridge.com =
<mailto:rshpount@turbobridge.com>>, Gonzalo Camarillo =
<Gonzalo.Camarillo@ericsson.com =
<mailto:Gonzalo.Camarillo@ericsson.com>>, Christer Holmberg =
<christer.holmberg@ericsson.com <mailto:christer.holmberg@ericsson.com>>
>> Subject: Re: [bfcpbis] WGLC for draft-ietf-bfcpbis-rfc4583bis
>> =20
>> Hi Charles, all,=20
>> =20
>> S3
>> =20
>> - TCP transport indent is hard to parse. Suggest changing sentence to =
"Depending on the value of the 'setup' attribute (discussed in Section =
8.1), the port field contains either the port to which the remote =
endpoint will direct BFCP messages, or in the case where the endpoint =
will initiate the connection towards the remote endpoint, should be set =
to a value of 9."
>> =20
>> [cue] works for me
>> =20
>> =20
>> S4.1
>> =20
>> - "The offerer includes this attribute to state all the roles it =
would be willing to perform=E2=80=9D: add =E2=80=9Conce negotiation is =
complete=E2=80=9D, for clarity.
>> =20
>> [cue] good idea
>> =20
>> - Here, plus S11.1 and S11.2, floorctrl is optional with inferred =
state of c-only for an offerer if it is not specified. I would advocate =
taking this opportunity to get rid of ambiguity and making the presence =
of floorctrl a MUST. Everyone does it already, but it=E2=80=99s one of =
the most problematic fields for interop as it is.
>> =20
>> - Also, given in an answer only one role is present, but in an offer =
multiple can be present, can this be clearer in the ABNF? Is it possible =
to specify two ABNFs, one for the offer and one for the answer (the =
answer being without the *)? If that=E2=80=99s not possible, then could =
we at least emphasise this point near the start of the section (again =
coming at this from too many interop issues in this area).
>> =20
>> [cue] Christer seemed to agree with you. I have been a proponent of =
not breaking backward compatibility with RFC 4583 unnecessarily. Anyone =
from the original RFC 4583 days able to shed some light on this?
> =20
> I agree with Christer here - it=E2=80=99s not a break in backward =
compatibility to mandate it from a offerer's point of view in the new =
spec, since this is all which is changing. An old answerer can cope. The =
only issue is a new-spec-compliant answerer with an old receiver. To be =
fully belt-and-braces here, the receiver should be able to cope without =
one and infer it, but the sender MUST always send it.
> =20
> [cue] Yes, you and Christer are correct about the backward =
compatibility part. I had it wrong.
> =20
> BTW just to flag up my second point there was unrelated to the first, =
which you answered=E2=80=A6 I=E2=80=99m not sure how best to present =
this information but I think it=E2=80=99s important it=E2=80=99s clearer =
near the ABNF definition that multiple roles are possible in an offer.
> =20
> [cue] Section includes this example:
> =20
>    The following is an example of a 'floorctrl' attribute in an offer.
>    When this attribute appears in an answer, it only carries one role:
> =20
>              a=3Dfloorctrl:c-only s-only c-s
> =20
> Do you think it would help if we added another role to one of the =
offers in the examples in section 12?
> e.g.=20
>    The following is an example of an offer sent by a conference server
>    to a client.
> =20
>    m=3Dapplication 50000 TCP/TLS/BFCP *
>    a=3Dsetup:passive
>    a=3Dconnection:new
>    a=3Dfingerprint:sha-256 \
>         19:E2:1C:3B:4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73:04: \
>         BB:05:2F:70:9F:04:A9:0E:05:E9:26:33:E8:70:88:A2
>    a=3Dfloorctrl:c-only s-only
> =20

Yes, I think that would be beneficial. I would also propose adding the =
following sentence directly after the ABNF in S4.1: =E2=80=9CThe offer =
will include one or more roles in its offer; the answerer MUST include =
only one role=E2=80=9D. (The section then goes on to describe why=E2=80=A6=
 But this is probably the top issue in BFCP interop I want to see it =
totally clear). It may also be worth adding a final sentence that =E2=80=9C=
If the answerer does not support any corresponding role, it MUST =
zero-port the m-line=E2=80=9D.

>> S6
>> =20
>> - =E2=80=9C=E2=80=A6identified by an SDP label attribute=E2=80=9D. =
For consistency, please put =E2=80=98label=E2=80=99 in single quotes.
>> =20
>> [cue] good idea
>> =20
>> - Why is mstrm: optional in the ABNF, and optional in the paragraph =
beginning =E2=80=9CThe floorid attribute=E2=80=A6=E2=80=9D, yet is =
mandatory in the =E2=80=9CEndpoints that use the offer/answer=E2=80=A6=E2=80=
=9D section? If there is a genuine reason for it to be optional please =
specify this, however I think it would be easier just to make it =
mandatory.
>> =20
>> [cue] The floorid is defined such that one can specify a floorid yet =
not associate it with any media stream, thus the mstrm is optional. This =
is how it was defined in RFC 4583. I am not sure if anyone makes use of =
this, but that is how it was defined.
> =20
> It would be useful to understand what the use case is for this, but =
whether or not it=E2=80=99s required the text is still inconsistent. "It =
defines a floor identifier and, possibly, associates it with one or more =
media streams.=E2=80=9D makes it sound optional, whereas "A floor =
control server acting as an offerer or as an answerer MUST include these =
attributes in its session descriptions.=E2=80=9D says =E2=80=9Cthese =
attributes=E2=80=9D which I took to mean both label and floorid, and =
once you=E2=80=99re including label the inference is that mstrm: should =
be added.
> =20
> I think it would be beneficial to clarify one way or the other. Either =
mstrm: is a MUST, or clarify why and how it could be used optionally.
> =20
> [cue] I see now. If =E2=80=9Clabel=E2=80=9D is required it seems you =
need at least one =E2=80=9Cmstrm=E2=80=9D, right?
> So how about if we change as follows:
> =20
> OLD : floor-id-attribute =3D "a=3Dfloorid:" token [" mstrm:" token =
*(SP token)]
> NEW: floor-id-attribute =3D "a=3Dfloorid:" token " mstrm:" token [*(SP =
token)]
> OLD: It defines a floor identifier and, possibly, associates it with =
one or more media streams.
> NEW: It defines a floor identifier and associates it with one or more =
media streams.
> =20
> Although I likely botched the ABNF.

My issue is not so much that this is permitted without mstrm:, just that =
it is inconsistent.

I am not familiar with a scenario where it would be valid without mstrm: =
=E2=80=A6 If there is one I have no problem with this being permitted, =
but then I would suggest changing =E2=80=9CA floor control server acting =
as an offerer or as an answerer MUST include these attributes in its =
session descriptions.=E2=80=9D to be =E2=80=9CA floor control server =
acting as an offerer or as an answerer MUST include the `floorid` =
attribute, and the `label` attribute if using the `mstrm` parameter, in =
its session descriptions.=E2=80=9D.

If there must always be a mstrm: , then your proposal would be the =
appropriate fix.

One or the other - at the moment I think the text is a little confusing.

Regards,
Alan



--Apple-Mail=_CA191390-236E-4D29-8B84-5326FD36F544
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Charles, all,<div class=3D""><br class=3D""></div><div =
class=3D"">Inline=E2=80=A6</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
7 Aug 2017, at 19:56, Charles Eckel (eckelcu) &lt;<a =
href=3D"mailto:eckelcu@cisco.com" class=3D"">eckelcu@cisco.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);"><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"border-style: =
solid none none; border-top-color: rgb(181, 196, 223); border-top-width: =
1pt; padding: 3pt 0in 0in;" class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><b class=3D""><span style=3D"font-family: Calibri, =
sans-serif;" class=3D"">From:<span =
class=3D"Apple-converted-space">&nbsp;</span></span></b><span =
style=3D"font-family: Calibri, sans-serif;" class=3D"">Alan Ford &lt;<a =
href=3D"mailto:alan.ford@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">alan.ford@gmail.com</a>&gt;<br =
class=3D""><b class=3D"">Date:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>Monday, August 7, 2017 =
at 1:37 AM<br class=3D""><b class=3D"">To:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>Charles Eckel &lt;<a =
href=3D"mailto:eckelcu@cisco.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">eckelcu@cisco.com</a>&gt;<br =
class=3D""><b class=3D"">Cc:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>"<a =
href=3D"mailto:bfcpbis@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">bfcpbis@ietf.org</a>" &lt;<a =
href=3D"mailto:bfcpbis@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">bfcpbis@ietf.org</a>&gt;, Tom =
Kristensen &lt;<a href=3D"mailto:tomkrist@cisco.com" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">tomkrist@cisco.com</a>&gt;, Roman Shpount &lt;<a =
href=3D"mailto:rshpount@turbobridge.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">rshpount@turbobridge.com</a>&gt;, =
Gonzalo Camarillo &lt;<a href=3D"mailto:Gonzalo.Camarillo@ericsson.com" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">Gonzalo.Camarillo@ericsson.com</a>&gt;, Christer Holmberg =
&lt;<a href=3D"mailto:christer.holmberg@ericsson.com" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">christer.holmberg@ericsson.com</a>&gt;<br class=3D""><b =
class=3D"">Subject:<span =
class=3D"Apple-converted-space">&nbsp;</span></b>Re: [bfcpbis] WGLC for =
draft-ietf-bfcpbis-rfc4583bis<o:p class=3D""></o:p></span></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Hi Charles, all,<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Further comments inline=E2=80=A6<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D"" =
type=3D"cite"><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">On 3 =
Aug 2017, at 23:19, Charles Eckel (eckelcu) &lt;<a =
href=3D"mailto:eckelcu@cisco.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">eckelcu@cisco.com</a>&gt; =
wrote:<o:p class=3D""></o:p></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; background-color: white;" =
class=3D"">Please see inline [cue]<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; background-color: white;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; background-color: white;" =
class=3D""><b class=3D""><span style=3D"font-family: Calibri, =
sans-serif;" class=3D"">From:<span =
class=3D"apple-converted-space">&nbsp;</span></span></b><span =
style=3D"font-family: Calibri, sans-serif;" class=3D"">Alan Ford &lt;<a =
href=3D"mailto:alan.ford@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">alan.ford@gmail.com</span></a>&gt;<br class=3D""><b =
class=3D"">Date:<span =
class=3D"apple-converted-space">&nbsp;</span></b>Sunday, July 23, 2017 =
at 1:01 AM<br class=3D""><b class=3D"">To:<span =
class=3D"apple-converted-space">&nbsp;</span></b>Charles Eckel &lt;<a =
href=3D"mailto:eckelcu@cisco.com" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">eckelcu@cisco.com</span></a>&gt;<br class=3D""><b =
class=3D"">Cc:<span class=3D"apple-converted-space">&nbsp;</span></b>"<a =
href=3D"mailto:bfcpbis@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">bfcpbis@ietf.org</span></a>" &lt;<a =
href=3D"mailto:bfcpbis@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">bfcpbis@ietf.org</span></a>&gt;, Tom Kristensen &lt;<a =
href=3D"mailto:tomkrist@cisco.com" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">tomkrist@cisco.com</span></a>&gt;, Roman Shpount &lt;<a =
href=3D"mailto:rshpount@turbobridge.com" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">rshpount@turbobridge.com</span></a>&gt;, Gonzalo Camarillo =
&lt;<a href=3D"mailto:Gonzalo.Camarillo@ericsson.com" style=3D"color: =
purple; text-decoration: underline;" class=3D""><span style=3D"color: =
purple;" class=3D"">Gonzalo.Camarillo@ericsson.com</span></a>&gt;, =
Christer Holmberg &lt;<a href=3D"mailto:christer.holmberg@ericsson.com" =
style=3D"color: purple; text-decoration: underline;" class=3D""><span =
style=3D"color: purple;" =
class=3D"">christer.holmberg@ericsson.com</span></a>&gt;<br class=3D""><b =
class=3D"">Subject:<span =
class=3D"apple-converted-space">&nbsp;</span></b>Re: [bfcpbis] WGLC for =
draft-ietf-bfcpbis-rfc4583bis</span><o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; background-color: white;" class=3D"">Hi Charles, all,<span =
class=3D"apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">S3<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">- TCP transport =
indent is hard to parse. Suggest changing sentence to "Depending on the =
value of the 'setup' attribute (discussed in Section 8.1), the port =
field contains either the port to which the remote endpoint will direct =
BFCP messages, or in the case where the endpoint will initiate the =
connection towards the remote endpoint, should be set to a value of =
9."<o:p class=3D""></o:p></div></div><div class=3D""><div style=3D"margin:=
 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">[cue] works for me<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">S4.1<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">- "The offerer =
includes this attribute to state all the roles it would be willing to =
perform=E2=80=9D: add =E2=80=9Conce negotiation is complete=E2=80=9D, =
for clarity.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">[cue] good idea<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">- Here, plus =
S11.1 and S11.2, floorctrl is optional with inferred state of c-only for =
an offerer if it is not specified. I would advocate taking this =
opportunity to get rid of ambiguity and making the presence of floorctrl =
a MUST. Everyone does it already, but it=E2=80=99s one of the most =
problematic fields for interop as it is.<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">- Also, given in =
an answer only one role is present, but in an offer multiple can be =
present, can this be clearer in the ABNF? Is it possible to specify two =
ABNFs, one for the offer and one for the answer (the answer being =
without the *)? If that=E2=80=99s not possible, then could we at least =
emphasise this point near the start of the section (again coming at this =
from too many interop issues in this area).<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">[cue] Christer seemed to agree with =
you. I have been a proponent of not breaking backward compatibility with =
RFC 4583 unnecessarily. Anyone from the original RFC 4583 days able to =
shed some light on this?<o:p =
class=3D""></o:p></div></div></div></div></blockquote><div class=3D""><div=
 style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I agree with Christer here - it=E2=80=99s not a break =
in backward compatibility to mandate it from a offerer's point of view =
in the new spec, since this is all which is changing. An old answerer =
can cope. The only issue is a new-spec-compliant answerer with an old =
receiver. To be fully belt-and-braces here, the receiver should be able =
to cope without one and infer it, but the sender MUST always send =
it.<o:p class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">[cue] =
Yes, you and Christer are correct about the backward compatibility part. =
I had it wrong.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">BTW just to flag up my second point there was =
unrelated to the first, which you answered=E2=80=A6 I=E2=80=99m not sure =
how best to present this information but I think it=E2=80=99s important =
it=E2=80=99s clearer near the ABNF definition that multiple roles are =
possible in an offer.<o:p class=3D""></o:p></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin:=
 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">[cue] Section includes this example:<o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp; The following is an example of a 'floorctrl' =
attribute in an offer.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 10pt; =
font-family: 'Courier New', serif;" class=3D"">&nbsp;&nbsp; When this =
attribute appears in an answer, it only carries one role:<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 10pt; font-family: 'Courier =
New', serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; a=3Dfloorctrl:c-only s-only c-s<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">Do =
you think it would help if we added another role to one of the offers in =
the examples in section 12?<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">e.g.<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;The following is an example of an offer =
sent by a conference server<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 10pt; =
font-family: 'Courier New', serif;" class=3D"">&nbsp;&nbsp; to a =
client.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 10pt; font-family: 'Courier New', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 10pt; =
font-family: 'Courier New', serif;" class=3D"">&nbsp;&nbsp; =
m=3Dapplication 50000 TCP/TLS/BFCP *<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp; a=3Dsetup:passive<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp; a=3Dconnection:new<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp; a=3Dfingerprint:sha-256 \<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
19:E2:1C:3B:4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73:04: \<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
BB:05:2F:70:9F:04:A9:0E:05:E9:26:33:E8:70:88:A2<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: 'Courier New', serif;" =
class=3D"">&nbsp;&nbsp; a=3Dfloorctrl:c-only s-only<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div></div></div></div></div></blockquote><d=
iv><br class=3D""></div>Yes, I think that would be beneficial. I would =
also propose adding the following sentence directly after the ABNF in =
S4.1: =E2=80=9CThe offer will include one or more roles in its offer; =
the answerer MUST include only one role=E2=80=9D. (The section then goes =
on to describe why=E2=80=A6 But this is probably the top issue in BFCP =
interop I want to see it totally clear). It may also be worth adding a =
final sentence that =E2=80=9CIf the answerer does not support any =
corresponding role, it MUST zero-port the m-line=E2=80=9D.<br =
class=3D""><div><br class=3D""></div><blockquote type=3D"cite" =
class=3D""><div class=3D"WordSection1" style=3D"page: WordSection1; =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255, =
255);"><div class=3D""><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D""></o:p></div><blockquote style=3D"margin-top: =
5pt; margin-bottom: 5pt;" class=3D"" type=3D"cite"><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; background-color: white;" =
class=3D"">S6<o:p class=3D""></o:p></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; background-color: white;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">- =E2=80=9C=E2=80=A6identified by =
an SDP label attribute=E2=80=9D. For consistency, please put =E2=80=98labe=
l=E2=80=99 in single quotes.<o:p class=3D""></o:p></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">[cue] good idea<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D"">- Why is mstrm: =
optional in the ABNF, and optional in the paragraph beginning =E2=80=9CThe=
 floorid attribute=E2=80=A6=E2=80=9D, yet is mandatory in the =
=E2=80=9CEndpoints that use the offer/answer=E2=80=A6=E2=80=9D section? =
If there is a genuine reason for it to be optional please specify this, =
however I think it would be easier just to make it mandatory.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D"">[cue] The floorid is defined such =
that one can specify a floorid yet not associate it with any media =
stream, thus the mstrm is optional. This is how it was defined in RFC =
4583. I am not sure if anyone makes use of this, but that is how it was =
defined.<o:p class=3D""></o:p></div></div></div></blockquote><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">It would be useful to understand what the use case is for =
this, but whether or not it=E2=80=99s required the text is still =
inconsistent. "It defines a floor identifier and, possibly, associates =
it with one or more media streams.=E2=80=9D makes it sound optional, =
whereas "A floor control server acting as an offerer or as an answerer =
MUST include these attributes in its session descriptions.=E2=80=9D says =
=E2=80=9Cthese attributes=E2=80=9D which I took to mean both label and =
floorid, and once you=E2=80=99re including label the inference is that =
mstrm: should be added.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I think it would be beneficial to clarify one way or =
the other. Either mstrm: is a MUST, or clarify<span =
class=3D"Apple-converted-space">&nbsp;</span><i class=3D"">why and =
how</i>&nbsp;it could be used optionally.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">[cue] I see now. If =E2=80=9Clabel=E2=80=9D=
 is required it seems you need at least one =E2=80=9Cmstrm=E2=80=9D, =
right?<o:p class=3D""></o:p></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">So how about if we change as follows:<o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">OLD =
: floor-id-attribute =3D "a=3Dfloorid:" token [" mstrm:" token *(SP =
token)]<o:p class=3D""></o:p></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">NEW: floor-id-attribute =3D "a=3Dfloorid:" token " mstrm:" =
token [*(SP token)]<o:p class=3D""></o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">OLD: It defines a floor identifier and, possibly, associates =
it with one or more media streams.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">NEW: It defines a floor identifier and =
associates it with one or more media streams.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Although I likely botched the =
ABNF.</div></div></div></div></blockquote><div><br class=3D""></div>My =
issue is not so much that this is permitted without mstrm:, just that it =
is inconsistent.</div><div><br class=3D""></div><div>I am not familiar =
with a scenario where it would be valid without mstrm: =E2=80=A6 If =
there is one I have no problem with this being permitted, but then I =
would suggest changing =E2=80=9CA floor control server acting as an =
offerer or as an answerer MUST include these attributes in its session =
descriptions.=E2=80=9D to be =E2=80=9CA floor control server acting as =
an offerer or as an answerer MUST include the `floorid` attribute, and =
the `label` attribute if using the `mstrm` parameter, in its session =
descriptions.=E2=80=9D.</div><div><br class=3D""></div><div>If there =
must always be a mstrm: , then your proposal would be the appropriate =
fix.</div><div><br class=3D""></div><div>One or the other - at the =
moment I think the text is a little confusing.</div><div><br =
class=3D""></div><div>Regards,</div><div>Alan</div><div><br =
class=3D""></div><div><br class=3D""></div></div></body></html>=

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