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boundary="_004_BN0PR02MB7984E8FB218D3305CA902DC78CE89BN0PR02MB7984namp_" MIME-Version: 1.0 X-OriginatorOrg: qti.qualcomm.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BN0PR02MB7984.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 230fc3e8-882e-438f-3f5c-08d95071d425 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Jul 2021 20:13:26.8232 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 98e9ba89-e1a1-4e38-9007-8bdabc25de1d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: YmQ2Z9F6WPxoxUFd5p747LXEdKO+0P5n4FLyyG+E6D45UH/8dFP2FQcqGtS3EDHjw9UKF1o/7lrB1oOeVHhCrZZmrYBpX1EFUerAjGNHvAg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR02MB5331 Archived-At: X-Mailman-Approved-At: Sun, 01 Aug 2021 08:44:04 -0700 Subject: [sipcore] RFC draft update X-BeenThere: sipcore@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SIP Core Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Jul 2021 20:13:36 -0000 --_004_BN0PR02MB7984E8FB218D3305CA902DC78CE89BN0PR02MB7984namp_ Content-Type: multipart/alternative; boundary="_000_BN0PR02MB7984E8FB218D3305CA902DC78CE89BN0PR02MB7984namp_" --_000_BN0PR02MB7984E8FB218D3305CA902DC78CE89BN0PR02MB7984namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello SIPCORE team, We are updating RFC Draft "draft-khatri-sipcore-call-transfer-fail-response= " with version 01. The purpose of the draft update 1. Deprecated "iut-focus.497" 2. Updated Warning Error code numbering. Regards, Shrawan Khatri and Team From: Shrawan Khatri Sent: Thursday, March 11, 2021 10:11 AM To: sipcore-chairs@ietf.org; sipcore@ietf.org Cc: Lena Chaponniere ; Waqar Zia ; Vikram Singh (IMS) ; Marcelo Pazos ; Simon Hsu ; Yong Xie Subject: Motivation for submission of RFC Hello SIPCORE Chair and SIPCORE team, Please find the motivation behind this RFC draft. Regards, Shrawan Khatri and team The purpose of the draft Signaling plane and Media plane of an IMS calls can be transferred between = devices using IMS Signaling. There are various reasons why an on-going call= cannot be transferred between the devices. Some of these reasons are polic= y driven, for instance: the call to be transferred is in the circuit switch= ed (CS) domain and the operator's policy does not allow transfer of a CS ca= ll, the call is an emergency call and the operator's policy does not allow = transfer of an emergency call, the call is a mobile-terminated call and the= operator's policy does not allow transfer of a mobile-terminated call, or = the call is a video call and the operator's policy does not allow transfer = of a video call. The user agent (UA) initiating the call transfer procedure= will be notified of any failure through a SIP response code. However the e= xisting SIP response codes are not suitable to adequately convey the inform= ation regarding why the call transfer request is not accepted by the networ= k. This is because handling of these existing response codes has already be= en implemented by various devices, with an associated device behavior defin= ed for a specific purpose not related to call transfer. For instance, upon = receiving some of these response codes, such as 403 (Forbidden), the device= may initiate IMS re-registration procedure, which is not needed in case of= Call Pull/Call Push failure and will result in unnecessary SIP signaling. A method is defined in this draft such that a call transfer failure SIP res= ponse code is defined along with an optional warning code in a Warning head= er field to convey the exact reason why the call could not be transferred, = so that the UA can determine the subsequent steps (e.g. call termination) a= nd optionally provide an indication of the reason for the failure to the us= er. Intended target audience The following is the intended audience of this RFC: * IMS Core Network Planners that support IMS call transfer acro= ss multiple devices. * IMS System Designer and Developers of IMS Core Network and Us= er Agent that support call transfer using IMS Signaling. Benefit * In the absence of this new mechanism, o The IMS Core network has to rely on existing SIP response cod= es, for which a specific device behavior has already been defined. For inst= ance, upon receiving some of these response codes, such as 403 (Forbidden),= the device may initiate IMS re-registration procedure, which is not needed= in case of call transfer failure and will result in unnecessary SIP signal= ing. o The existing SIP response codes do not accurately convey the = reason for the call transfer failure. * With the new mechanism o A specific behavior can be defined for the new SIP response c= ode. o Unnecessary SIP signaling may be avoided. o A User Agent may develop intelligent algorithms for subsequen= t call transfer procedure based on the warning code received in the Warning= header field along with the new SIP response code. Name: draft-khatri-sipcore-call-transfer-fail-response Revision: 00 Title: A SIP Response Code (497) for Call Transfer Fai= lure Document date: 2021-03-11 Group: Individual Submission Pages: 10 URL: https://www.ietf.org/archive/id/draft-khatri-sipcore-call-t= ransfer-fail-response-00.txt Status: https://datatracker.ietf.org/doc/draft-khatri-sipcore-call-= transfer-fail-response/ Htmlized: https://datatracker.ietf.org/doc/html/draft-khatri-sipcore-= call-transfer-fail-response Htmlized: https://tools.ietf.org/html/draft-khatri-sipcore-call-trans= fer-fail-response-00 --_000_BN0PR02MB7984E8FB218D3305CA902DC78CE89BN0PR02MB7984namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hello SIPCORE team,

We are updating RFC Draft “draft-khatri-sipcor= e-call-transfer-fail-response” with version 01.

The purpose of the draft update

  1. Deprecated “iut-focus.497”
  2. Updated Warning Error code numbering.

Regards,

Shrawan Khatri and Team

 

 

Fr= om: Shrawan Khatri
Sent: Thursday, March 11, 2021 10:11 AM
To: sipcore-chairs@ietf.org; sipcore@ietf.org
Cc: Lena Chaponniere <lguellec@qti.qualcomm.com>; Waqar Zia &l= t;wzia@qti.qualcomm.com>; Vikram Singh (IMS) <viksingh@qti.qualcomm.c= om>; Marcelo Pazos <mpazos@qti.qualcomm.com>; Simon Hsu <simonh= @qti.qualcomm.com>; Yong Xie <yongxie@qti.qualcomm.com>
Subject: Motivation for submission of RFC

 

Hello SIPCORE Chair and SIPCORE team,

Please find the motivation behind this RFC draft.

 

Regards,

Shrawan Khatri and team

 

The purpose of the draft

Signaling plane and Media= plane of an IMS calls can be transferred between devices using IMS Signali= ng. There are various reasons why an on-going call cannot be transferred be= tween the devices. Some of these reasons are policy driven, for instance: the call to be transferred is in the circ= uit switched (CS) domain and the operator's policy does not allow transfer = of a CS call, the call is an emergency call and the operator's policy does = not allow transfer of an emergency call, the call is a mobile-terminated call and the operator's policy does = not allow transfer of a mobile-terminated call, or the call is a video call= and the operator's policy does not allow transfer of a video call. The use= r agent (UA) initiating the call transfer procedure will be notified of any failure through a SIP response = code. However the existing SIP response codes are not suitable to adequatel= y convey the information regarding why the call transfer request is not acc= epted by the network. This is because handling of these existing response codes has already been implemented by = various devices, with an associated device behavior defined for a specific = purpose not related to call transfer. For instance, upon receiving some of = these response codes, such as 403 (Forbidden), the device may initiate IMS re-registration procedure, which = is not needed in case of Call Pull/Call Push failure and will result in unn= ecessary SIP signaling.

 

A method is defined in th= is draft such that a call transfer failure SIP response code is defined alo= ng with an optional warning code in a Warning header field to convey the ex= act reason why the call could not be transferred, so that the UA can determine the subsequent steps (e.g. call = termination) and optionally provide an indication of the reason for the fai= lure to the user.

 

Intended target audience

The following is the inte= nded audience of this RFC:

•   = ;          IMS Core Network Pl= anners that support IMS call transfer across multiple devices.

•   = ;          IMS System Designer= and Developers of IMS Core Network and User Agent that support call transf= er using IMS Signaling.

 

Benefit

•   = ;          In the absence of t= his new mechanism,

o    = ;         The IMS Core network has = to rely on existing SIP response codes, for which a specific device behavio= r has already been defined. For instance, upon receiving some of these resp= onse codes, such as 403 (Forbidden), the device may initiate IMS re-registration procedure, which = is not needed in case of call transfer failure and will result in unnecessa= ry SIP signaling.

o    = ;         The existing SIP response= codes do not accurately convey the reason for the call transfer failure.

 

•   = ;          With the new mechan= ism

o    = ;         A specific behavior can b= e defined for the new SIP response code.

o    = ;         Unnecessary SIP signaling= may be avoided.

o    = ;         A User Agent may develop = intelligent algorithms for subsequent call transfer procedure based on the = warning code received in the Warning header field along with the new SIP re= sponse code.

 

Name:       &n= bsp;          draft-khatri-sip= core-call-transfer-fail-response

Revision:      &nbs= p;       00

Title:       &= nbsp;           &nbs= p;  A SIP Response Code (497) for Call Transfer Failure

Document date:      = ;         2021-03-11

Group:       &= nbsp;          Individual Subm= ission

Pages:       &= nbsp;           10

URL:       &nb= sp;    https://www.ietf.org/archive/id/draft-khatri-sipcore-call-transfer-fail-res= ponse-00.txt

Status:       =   https://datatracker.ietf.org/doc/draft-khatri-sipcore-call-transfer-fail-re= sponse/

Htmlized:       https://datatracker.ietf.org/doc/html/draft-khatri-sipcore-call-transfer-fa= il-response

Htmlized:       https://tools.ietf.org/html/draft-khatri-sipcore-call-transfe= r-fail-response-00

 

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p6pAqAU9tz/ye5ftc44afJAeYRGPttxU80CWmMbCIeFu9PyVYX97w5ZT8KmITyN6EB6NUsA+pB84HDwF7jbogV51v0E3iZzMaAbUEfZ1/GI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR07MB4330 Archived-At: Subject: [sipcore] 4028bis re-start X-BeenThere: sipcore@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SIP Core Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Aug 2021 19:16:46 -0000 --_000_HE1PR07MB4441DFF0A67129CE3B9B36EA93F29HE1PR07MB4441eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi session-timer lovers, The work on 4028bis has been postponed for a long time. I will now try to reboot the work, and hopefully we will be able to finaliz= e the work soon. SCOPE: =3D=3D=3D=3D=3D=3D I think it is important to keep in mind that the purpose of the work is to = fix the issues associated with RFC 4028 - not to add new functionality, or = change existing functionality just because someone thinks the functionality= would be "better" that way. Of course, if people identity other errors in RFC 4028, those can also be f= ixed. A number of issues have been opened on GitHub, so we need to take a look at= those: https://github.com/cdh4u/draft-sessiontimer-race/issues BACKGROUND MATERIAL: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D IETF #101 SIPCORE session-timer presentation: https://github.com/cdh4u/draft-sessiontimer-race/blob/master/IETF101_SIPCOR= E_SESSION-RACE.pdf IETF #101 SIPCORE minutes: https://datatracker.ietf.org/meeting/101/materials/minutes-101-sipcore-00 IETF #101 SIPCORE YouTube recording: https://www.youtube.com/watch?v=3DkZdtpZe0-9E GitHub issues: https://github.com/cdh4u/draft-sessiontimer-race/issues PROBLEM: =3D=3D=3D=3D=3D=3D=3D=3D=3D The problem is explained in the background material above, and also in the = draft, but in a nutshell: When an UPDATE transaction is triggered during an ongoing (re-)INVITE trans= action, and if both transactions contain session-timer information, it can = lead to a glare situation where it is unclear who is the refresher. SOLUTION: =3D=3D=3D=3D=3D=3D=3D=3D=3D The proposed solution has been to say that, if a UAC ends up in a situation= where the session-timer property values are unclear, the UA MUST trigger a= "session-timer clean up" UPDATE transaction. This is also aligned with the UAC procedures defined in RFC 6141 (Re-INVITE= and Target-Refresh Request Handling in the Session Initiation Protocol (SI= P): https://datatracker.ietf.org/doc/html/rfc6141#section-3.4 There have also been some proposals on how to avoid the glare situation to = begin with: * Do not include session-timer information in UPDATE transactions that = are sent while there is an ongoing (re-)INVITE transaction. * Do now allow session-timer negotiation in UPDATE transactions to begi= n with - no matter whether there is an ongoing (re-)INVITE transaction or n= ot. * Once the refresher has been determined, don't change it during the se= ssion (in case of 3PCC etc it can be re-negotiated) * ... Regards, Christer --_000_HE1PR07MB4441DFF0A67129CE3B9B36EA93F29HE1PR07MB4441eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi session-timer lovers,

 

The work on 4028bis has been po= stponed for a long time.

 

I will now try to reboot the wo= rk, and hopefully we will be able to finalize the work soon.

 

SCOPE:

=3D=3D=3D=3D=3D=3D

 

I think it is important to keep= in mind that the purpose of the work is to fix the issues associated with = RFC 4028 - not to add new functionality, or change existing functionality j= ust because someone thinks the functionality would be “better” that way.

 

Of course, if people identity o= ther errors in RFC 4028, those can also be fixed.

 

A number of issues have been op= ened on GitHub, so we need to take a look at those: https:/= /github.com/cdh4u/draft-sessiontimer-race/issues

 

 

BACKGROUND MATERIAL:=

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

 

IETF #101 SIPCORE session-timer= presentation:

 

= https://github.com/cdh4u/draft-sessiontimer-race/blob/master/IETF101_SIPCOR= E_SESSION-RACE.pdf

 

IETF #101 SIPCORE minutes:=

 

https://datatracker.= ietf.org/meeting/101/materials/minutes-101-sipcore-00=

 

IETF #101 SIPCORE YouTube recor= ding:

 

https://www.youtube.com/watch?v=3DkZdtpZe0-9E

 

GitHub issues:

 

https://github.com/cdh4u/draft-session= timer-race/issues

 

 

PROBLEM:

=3D=3D=3D=3D=3D=3D=3D=3D=3D

 

The problem is explained in the= background material above, and also in the draft, but in a nutshell:<= /o:p>

 

 

When an UPDATE transaction is t= riggered during an ongoing (re-)INVITE transaction, and if both transaction= s contain session-timer information, it can lead to a glare situation where= it is unclear who is the refresher.

 

 

SOLUTION:

=3D=3D=3D=3D=3D=3D=3D=3D=3D

 

The proposed solution has been = to say that, if a UAC ends up in a situation where the session-timer proper= ty values are unclear, the UA MUST trigger a “session-timer clean up&= #8221; UPDATE transaction.

 

This is also aligned with the U= AC procedures defined in RFC 6141 (Re-INVITE and Target-Refresh Request Handling in the Sessi= on Initiation Protocol (SIP): https= ://datatracker.ietf.org/doc/html/rfc6141#section-3.4<= /p>

 

There have also been some propo= sals on how to avoid the glare situation to begin with:

 

  • Do not include session-timer information in UPDA= TE transactions that are sent while there is an ongoing (re-)INVITE transac= tion.
  • Do now allow session= -timer negotiation in UPDATE transactions to begin with – no matter w= hether there is an ongoing (re-)INVITE transaction or not.
  • Once the refresher has be= en determined, don’t change it during the session (in case of 3PCC et= c it can be re-negotiated)
  • …

 

 

Regards,

 

Christer

 

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