
From nobody Thu Jun 19 10:52:32 2014
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Subject: [straw] Protocol Action: 'Loop Detection Mechanisms for Session Initiation Protocol (SIP) Back-to- Back User Agents (B2BUAs)' to Proposed Standard (draft-ietf-straw-b2bua-loop-detection-04.txt)
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The IESG has approved the following document:
- 'Loop Detection Mechanisms for Session Initiation Protocol (SIP) Back-
   to- Back User Agents (B2BUAs)'
  (draft-ietf-straw-b2bua-loop-detection-04.txt) as Proposed Standard

This document is the product of the Sip Traversal Required for
Applications to Work Working Group.

The IESG contact persons are Richard Barnes and Alissa Cooper.

A URL of this Internet Draft is:
http://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-loop-detection/




Technical Summary:

Relevant content can frequently be found in the abstract and/or introduction of the document. If not, this may be an indication that there are deficiencies in the abstract or introduction.

SIP provides a means of preventing infinite request forwarding loop in [RFC3261], and a means of mitigating parallel forking amplification floods in [RFC5393].  Neither document normatively defines specific behavior for B2BUAs, however.

Unbounded SIP request loops have actually occurred in SIP deployments, numerous times. The cause of loops is usually misconfiguration, but the reason they have been unbounded/unending is they crossed B2BUAs that reset the Max-Forwards value in the SIP requests they generated on their UAC side.  Although such behavior is technically legal per [RFC3261] because a B2BUA is a UAC, the resulting unbounded loops have caused service outages and make troubleshooting difficult.

Furthermore, [RFC5393] also provides a mechanism to mitigate the impact of parallel forking amplification issues, through the use of a "Max-Breadth" header field.  If a B2BUA does not pass on this header field, parallel forking amplification is not mitigated with the [RFC5393] mechanism.

This document defines normative requirements for Max-Forwards and Max-Breadth header field behaviors of B2BUAs, in order to mitigate the effect of loops and parallel forking amplification.

Working Group Summary:

Was there anything in WG process that is worth noting? For example, was there controversy about particular points or were there decisions where the consensus was particularly rough?

The WG path of this document was reasonably short and efficient. Several technical comments were made during reviews and all were resolved with consensus.

There is consensus in the STRAW WG to publish this document.

Document Quality:

Are there existing implementations of the protocol? Have a significant number of vendors indicated their plan to implement the specification? Are there any reviewers that merit special mention as having done a thorough review, e.g., one that resulted in important changes or a conclusion that the document had no substantive issues? If there was a MIB Doctor, Media Type or other expert review, what was its course (briefly)? In the case of a Media Type review, on what date was the request posted?

The guidelines and procedures in the document is based on input  and experience from the implementer community.

Personnel:

Who is the Document Shepherd?


Christer Holmberg (christer.holmberg@ericsson.com -- STRAW WG co-chair).

Who is the Responsible Area Director?

Richard Barnes.

RFC Editor Note

OLD: 
   If the received request did not contain a Max-Forwards header field,
   one MUST be created in any request generated in the UAC side, which
   SHOULD be 70, as described for Proxies in section 16.6 part 3 of
   [RFC3261].
NEW: 
   If the received request did not contain a Max-Forwards header field,
   one MUST be created in any request generated in the UAC side, as 
   described for Proxies in section 16.6 part 3 of [RFC3261].  As in that
   specification, the value of the new Max-Forwards header SHOULD be 
   70.


From nobody Fri Jun 20 01:35:44 2014
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Subject: [straw] I-D Action: draft-ietf-straw-b2bua-rtcp-01.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Sip Traversal Required for Applications to Work Working Group of the IETF.

        Title           : Guidelines to support RTCP end-to-end in Back-to-Back User Agents (B2BUAs)
        Authors         : Lorenzo Miniero
                          Sergio Garcia Murillo
                          Victor Pascual
	Filename        : draft-ietf-straw-b2bua-rtcp-01.txt
	Pages           : 13
	Date            : 2014-06-20

Abstract:
   SIP Back-to-Back User Agents (B2BUAs) are often envisaged to also be
   on the media path, rather than just intercepting signalling.  This
   means that B2BUAs often implement an RTP/RTCP stack as well, whether
   to act as media transcoders or to just passthrough the media
   themselves, thus leading to separate media legs that the B2BUA
   correlates and bridges together.  If not disciplined, though, this
   behaviour can severely impact the communication experience,
   especially when statistics and feedback information contained in RTCP
   packets get lost because of mismatches in the reported data.

   This document defines the proper behaviour B2BUAs should follow when
   also acting on the signalling/media plane in order to preserve the
   end-to-end functionality of RTCP.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-rtcp/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-straw-b2bua-rtcp-01

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-straw-b2bua-rtcp-01


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Jun 20 17:05:12 2014
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Subject: [straw] Last Call: <draft-ietf-straw-sip-traceroute-02.txt> (A Media-based Traceroute Function for the Session Initiation Protocol (SIP)) to Proposed Standard
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The IESG has received a request from the Sip Traversal Required for
Applications to Work WG (straw) to consider the following document:
- 'A Media-based Traceroute Function for the Session Initiation Protocol
   (SIP)'
  <draft-ietf-straw-sip-traceroute-02.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2014-07-04. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   SIP already provides the ability to perform hop-by-hop traceroute
   for SIP messages using the Max-Forwards header field, in order to
   determine the reachability path of requests to a target.  A
   mechanism for media-loopback calls has also been defined separately,
   which enables test calls to be generated which result in media being
   looped back to the originator.  This document describes a means of
   performing hop-by-hop traceroute-style test calls using the media-
   loopback mechanism, in order to test the media path when SIP
   sessions go through media-relaying B2BUAs.




The file can be obtained via
http://datatracker.ietf.org/doc/draft-ietf-straw-sip-traceroute/

IESG discussion can be tracked via
http://datatracker.ietf.org/doc/draft-ietf-straw-sip-traceroute/ballot/


No IPR declarations have been submitted directly on this I-D.



From nobody Sat Jun 21 10:00:19 2014
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "straw@ietf.org" <straw@ietf.org>
Thread-Topic: New Version Notification for draft-ram-straw-b2bua-dtls-srtp-00.txt
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Subject: [straw] FW: New Version Notification for draft-ram-straw-b2bua-dtls-srtp-00.txt
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We have submitted a new draft that describes the behavior B2BUA=B9s should
follow when acting on a media plane that uses DTLS-SRTP.

http://tools.ietf.org/html/draft-ram-straw-b2bua-dtls-srtp-00


Comments and inputs are welcome

Regards,
Authors

-----Original Message-----
From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
Date: Saturday, 21 June 2014 11:01 am
To: Ram Mohan Ravindranath <rmohanr@cisco.com>, "Tirumaleswar Reddy
(tireddy)" <tireddy@cisco.com>, Victor Pascual
<victor.pascual@quobis.com>, Victor Pascual <victor.pascual@quobis.com>,
"Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Gonzalo Salgueiro
(gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar Reddy (tireddy)"
<tireddy@cisco.com>, Ram Mohan Ravindranath <rmohanr@cisco.com>
Subject: New Version Notification for
draft-ram-straw-b2bua-dtls-srtp-00.txt

>
>A new version of I-D, draft-ram-straw-b2bua-dtls-srtp-00.txt
>has been successfully submitted by Gonzalo Salgueiro and posted to the
>IETF repository.
>
>Name:		draft-ram-straw-b2bua-dtls-srtp
>Revision:	00
>Title:		DTLS-SRTP Handling in Session Initiation Protocol (SIP)
>Back-to-Back User Agents (B2BUAs)
>Document date:	2014-06-20
>Group:		Individual Submission
>Pages:		10
>URL:           =20
>http://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-dtls-srtp-00.txt
>Status:        =20
>https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-dtls-srtp/
>Htmlized:      =20
>http://tools.ietf.org/html/draft-ram-straw-b2bua-dtls-srtp-00
>
>
>Abstract:
>   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>   often function on the media plane, rather than just on the signaling
>   path.  This document describes the behavior B2BUAs should follow when
>   acting on the media plane that use Secure Real-time Transport
>   Protocol (SRTP) security context setup with Datagram Transport Layer
>   Security (DTLS) protocol.
>
>                 =20
>       =20
>
>
>Please note that it may take a couple of minutes from the time of
>submission
>until the htmlized version and diff are available at tools.ietf.org.
>
>The IETF Secretariat
>


From nobody Mon Jun 30 02:47:35 2014
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Date: Mon, 30 Jun 2014 09:47:27 +0000
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References: <20140621053151.26750.39604.idtracker@ietfa.amsl.com>, <CFCBB789.91D65%rmohanr@cisco.com>
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Archived-At: http://mailarchive.ietf.org/arch/msg/straw/tQv5QhY-9mFvLDWjE4lZNMe4E1o
Subject: Re: [straw] New Version Notification for draft-ram-straw-b2bua-dtls-srtp-00.txt
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(As co-chair)

Hi,

The draft below addresses the following STRAW delivery:

    "A document defining the requirements for B2BUAs to support DTLS-SRTP (=
RFC 5764) end-to-end submitted to the IESG as PS"

Currently there are no other drafts addressing the delivery, so our plan is=
 to perform an adoption call in the near future.=20

We therefor ask the community to take a look at the draft, to see whether t=
here is anything that needs to be addressed before such adoption call is ma=
de.

Thanks!

Regards,

Christer





________________________________________
From: straw [straw-bounces@ietf.org] on behalf of Ram Mohan R (rmohanr) [rm=
ohanr@cisco.com]
Sent: Saturday, 21 June 2014 8:00 PM
To: straw@ietf.org
Subject: [straw] FW: New Version Notification for draft-ram-straw-b2bua-dtl=
s-srtp-00.txt

We have submitted a new draft that describes the behavior B2BUA=B9s should
follow when acting on a media plane that uses DTLS-SRTP.

http://tools.ietf.org/html/draft-ram-straw-b2bua-dtls-srtp-00


Comments and inputs are welcome

Regards,
Authors

-----Original Message-----
From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
Date: Saturday, 21 June 2014 11:01 am
To: Ram Mohan Ravindranath <rmohanr@cisco.com>, "Tirumaleswar Reddy
(tireddy)" <tireddy@cisco.com>, Victor Pascual
<victor.pascual@quobis.com>, Victor Pascual <victor.pascual@quobis.com>,
"Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Gonzalo Salgueiro
(gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar Reddy (tireddy)"
<tireddy@cisco.com>, Ram Mohan Ravindranath <rmohanr@cisco.com>
Subject: New Version Notification for
draft-ram-straw-b2bua-dtls-srtp-00.txt

>
>A new version of I-D, draft-ram-straw-b2bua-dtls-srtp-00.txt
>has been successfully submitted by Gonzalo Salgueiro and posted to the
>IETF repository.
>
>Name:          draft-ram-straw-b2bua-dtls-srtp
>Revision:      00
>Title:         DTLS-SRTP Handling in Session Initiation Protocol (SIP)
>Back-to-Back User Agents (B2BUAs)
>Document date: 2014-06-20
>Group:         Individual Submission
>Pages:         10
>URL:
>http://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-dtls-srtp-00.txt
>Status:
>https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-dtls-srtp/
>Htmlized:
>http://tools.ietf.org/html/draft-ram-straw-b2bua-dtls-srtp-00
>
>
>Abstract:
>   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>   often function on the media plane, rather than just on the signaling
>   path.  This document describes the behavior B2BUAs should follow when
>   acting on the media plane that use Secure Real-time Transport
>   Protocol (SRTP) security context setup with Datagram Transport Layer
>   Security (DTLS) protocol.
>
>
>
>
>
>Please note that it may take a couple of minutes from the time of
>submission
>until the htmlized version and diff are available at tools.ietf.org.
>
>The IETF Secretariat
>

_______________________________________________
straw mailing list
straw@ietf.org
https://www.ietf.org/mailman/listinfo/straw=


From nobody Mon Jun 30 08:42:50 2014
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Date: Mon, 30 Jun 2014 11:42:46 -0400
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [straw] FW: New Version Notification for draft-ram-straw-b2bua-dtls-srtp-00.txt
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Comments on the draft:

General point:

This draft doesn't say anything about middleboxes that *remove* the 
encryption on the media stream. Especially given the recent issues about 
surveillance, I would think the right thing to do is say MUST NOT to 
this. OTOH, I assume that there are users of SBC who explicitly desire 
this behavior. At the least it should be discussed in the security 
considerations.

Section 3.2:

ISTM that Media Aware and Media Termination deserve separate treatment.

A Media Aware relay doesn't need to encrypt - it can pass the incoming 
packets through. So it could simply observe the fingerprints as they go 
by without changing them, and then use to do decryption.

Also, doesn't this depend on how much scrutiny it gives to the packets. 
IIUC, with SRTP the RTP packet headers are not encrypted, so some basic 
level of scrutiny of the RTP can be done without any decryption.

	Thanks,
	Paul

On 6/21/14 1:00 PM, Ram Mohan R (rmohanr) wrote:
> We have submitted a new draft that describes the behavior B2BUAšs should
> follow when acting on a media plane that uses DTLS-SRTP.
>
> http://tools.ietf.org/html/draft-ram-straw-b2bua-dtls-srtp-00
>
>
> Comments and inputs are welcome
>
> Regards,
> Authors
>
> -----Original Message-----
> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
> Date: Saturday, 21 June 2014 11:01 am
> To: Ram Mohan Ravindranath <rmohanr@cisco.com>, "Tirumaleswar Reddy
> (tireddy)" <tireddy@cisco.com>, Victor Pascual
> <victor.pascual@quobis.com>, Victor Pascual <victor.pascual@quobis.com>,
> "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>, "Gonzalo Salgueiro
> (gsalguei)" <gsalguei@cisco.com>, "Tirumaleswar Reddy (tireddy)"
> <tireddy@cisco.com>, Ram Mohan Ravindranath <rmohanr@cisco.com>
> Subject: New Version Notification for
> draft-ram-straw-b2bua-dtls-srtp-00.txt
>
>>
>> A new version of I-D, draft-ram-straw-b2bua-dtls-srtp-00.txt
>> has been successfully submitted by Gonzalo Salgueiro and posted to the
>> IETF repository.
>>
>> Name:		draft-ram-straw-b2bua-dtls-srtp
>> Revision:	00
>> Title:		DTLS-SRTP Handling in Session Initiation Protocol (SIP)
>> Back-to-Back User Agents (B2BUAs)
>> Document date:	2014-06-20
>> Group:		Individual Submission
>> Pages:		10
>> URL:
>> http://www.ietf.org/internet-drafts/draft-ram-straw-b2bua-dtls-srtp-00.txt
>> Status:
>> https://datatracker.ietf.org/doc/draft-ram-straw-b2bua-dtls-srtp/
>> Htmlized:
>> http://tools.ietf.org/html/draft-ram-straw-b2bua-dtls-srtp-00
>>
>>
>> Abstract:
>>    Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>>    often function on the media plane, rather than just on the signaling
>>    path.  This document describes the behavior B2BUAs should follow when
>>    acting on the media plane that use Secure Real-time Transport
>>    Protocol (SRTP) security context setup with Datagram Transport Layer
>>    Security (DTLS) protocol.
>>
>>
>>
>>
>>
>> Please note that it may take a couple of minutes from the time of
>> submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> The IETF Secretariat
>>
>
> _______________________________________________
> straw mailing list
> straw@ietf.org
> https://www.ietf.org/mailman/listinfo/straw
>

