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micalg=SHA1; protocol="application/x-pkcs7-signature"; boundary="----=_NextPart_000_0031_01DA456E.C44646B0" MIME-Version: 1.0 X-OriginatorOrg: ericsson.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: HE1PR07MB4441.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 57edeb4f-72d9-41f9-abe9-08dc13752342 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Jan 2024 13:48:20.3289 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: B2lwKb2ZZ9Vsl28gA7xON83YwHfgO+uCxGWFUh/oe7onyObpVRSx8dLdL096bm11rDP38Usnx10kB/EseZEOVhzEQH/VgcmTuJrOkGq6eU0= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR07MB7490 Archived-At: Subject: Re: [Wish] 2nd WG Last Call for draft-ietf-wish-whip X-BeenThere: wish@ietf.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: WebRTC Ingest Signaling over HTTPS List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Jan 2024 13:48:27 -0000 ------=_NextPart_000_0031_01DA456E.C44646B0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, >> The following issue has been discussed between myself and Sergio in: >> >> https://github.com/wish-wg/webrtc-http-ingest-protocol/issues/163 >>=20 >> However, I bring it to the list because I think it would be useful = to get=20 >> wider community input and guidance. >>=20 >> WHIP uses the SDP trickle-ice-sdpfrag content type for ICE restarts. >> However, RFC 8838 only defines usage of trickle-ice-sdpfrag = for trickle ICE. >> With SIP, an ICE restart triggers a new SDP renegotiation. >> =20 >> Now, AFAIK the justification of WHIP using PATCH with trickle-ice- >> sdpfrag also for ICE restart (instead of POST with a new SDP = offer), is the >> statement in Section 3, saying that SDP renegotiations are = not supported. >> >> =E2=80=9CIt is important to note that SDP renegotiations are not = supported in WHIP,=20 >> meaning that no modifications to the "m=3D" sections can be = made after the >> initial SDP offer/answer exchange via HTTP POST is completed = and only >> ICE related information can be updated via HTTP PATCH = requests as defined in >> Section 4.1.=E2=80=9D >>=20 >> =20 >> Q1: SDP renegotiation is more than the =E2=80=9Cm=3D=E2=80=9D = sections. There is also >> the session-level information, e.g., the = =E2=80=9Cc=3D=E2=80=9D section, the =E2=80=9Co=3D=E2=80=9D section etc. = So, >> I think the text needs to talk about what INFORMATION = can/cannot be >> updated. >=20 > Nothing can be changed except what we explicitly allowed in the 4.1. = ICE > support section. Section 4.1 only talks about ICE support in general. > I don't think we should make a list of what can and can't be > changed here, especially given that some of that info has the spec in > different RFCs which we may conflict with. Section 3 explicitly forbids modifying "m=3D" sections, but does not = e.g., talk about session-level information etc. Could we simply say? "Once the initial SDP offer/answer exchange via HTTP POST has been = completed, only the ICE credentials and candidates can be updated and renegotiated via HTTP PATCH, as defined in Section = 4.1." >> Q2: Related to Q1, the text says that ICE related information can be >> updated. But, if the =E2=80=9Cm=3D=E2=80=9D section cannot be = updated, does that also mean >> that the IP port in the host candidate cannot be updated, as that it = typically >> the port value also used in the =E2=80=9Cm=3D=E2=80=9D section? = Again, I think it is better to >> explicitly describe what information can be updated. > =20 > I disagree, it would be easy to contradict what is specified on = another rfcs. > We could even be more precise and change the " and only ICE related > information can be updated" by " and only certain ICE related = information > can be updated" See my reply to Q1. >> Q3: Related to Q1 and Q2, it needs to be clear what information the >> WHIP session can return in the PATCH response in case of an ICE = restart. Can >> the WHIP session change the port number of its host candidate? Etc. > =20 > As we are adding ICE restart in this draft, I agree that we should be = more > precise about the construction of the PATCH response. Do you have any > suggestions? I will try to create a PR for that. Since the WHIP client can only change certain ICE information, I guess = the same could apply to the WHIP session? 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