Re: [MMUSIC] Empty candidate lists in ice-sip-sdp offers and answers
Flemming Andreasen <fandreas@cisco.com> Mon, 13 May 2019 03:40 UTC
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To: Roman Shpount <rshpount@turbobridge.com>, Christer Holmberg <christer.holmberg@ericsson.com>
Cc: mmusic WG <mmusic@ietf.org>
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From: Flemming Andreasen <fandreas@cisco.com>
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Date: Sun, 12 May 2019 20:34:32 -0400
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Subject: Re: [MMUSIC] Empty candidate lists in ice-sip-sdp offers and answers
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On 4/29/19 5:27 PM, Roman Shpount wrote: > On Sat, Apr 27, 2019 at 2:02 PM Christer Holmberg > <christer.holmberg@ericsson.com > <mailto:christer.holmberg@ericsson.com>> wrote: > > ... > > >NOTE: Since it is possible that no candidates were provided in > the offer, or that all candidates in the offer > >where skipped due to unsupported address type or FQDN name > resolution failure, ICE nomination process > >can start with no remote candidates. This, however, does not > indicate an immediate ICE nomination failure. > >See <<draft-holmberg-ice-pac>> for more details. > > > >In the Receiving the Initial Answer section I have added the > following: > > > >NOTE: Since it is possible that no candidates were provided in > the answer, or that all candidates in the answer > >where skipped due to unsupported address type or FQDN name > resolution failure, ICE nomination process can > >start with no remote candidates. This, however, does not > indicate an immediate ICE nomination failure. > >See <<draft-holmberg-ice-pac>> for more details. > > I think the text is confusing, because it starts talking about the > ICE nomination process. There are other things that happen before, > including the creation of candidate pairs. > > So, I think the text should say that the agent will not be able to > create candidate pairs, and it will not be able to start sending > connectivity checks. Instead it will wait for the peer agent to > start sending connectivity checks, that the agent will then > process as peer reflexive candidates. > > I will try to come up with some text that uses the same terminology as > RFC 8445. Do you have the suggested text ? > > >I wanted to get the group's opinion regarding: > > > >1. Allowing offers and answers with no candidates > > I am ok with the principle. There seem to be use-cases for it, so... > Agreed. > > >2. Adding a reference to draft-holmberg-ice-pac regarding how > such session descriptions or session descriptions where all > candidates were rejected are handled. > > The reference in the text above is misleading, because to me it > sounds like PAC describes how to process offers/answers without > candidates. PAC is only about a timer. > > > Maybe this draft should cover the situation when session description > processing did not generate any candidates. The fact that ICE has some > minimal run timer is not enough. We still need something that > explicitly states that it is acceptable to run ICE nomination process > without candidates since, as far as I know, nothing in RFC 8445 > specifies if this is allowed or not. I am not in favor of adding a normative dependency to ice-pac at this late stage. Why do we need that ? Thanks -- Flemming (with chair hat on) > > Regards, > ___________________________________________ > Roman Shpount | CTO | Cell: +1(202) 262-8672 > 4905 Del Ray Ave, Suite 300 | Bethesda, MD 20814 > TurboBridge > > > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic
- [MMUSIC] Empty candidate lists in ice-sip-sdp off… Roman Shpount
- Re: [MMUSIC] Empty candidate lists in ice-sip-sdp… Christer Holmberg
- Re: [MMUSIC] Empty candidate lists in ice-sip-sdp… Roman Shpount
- Re: [MMUSIC] Empty candidate lists in ice-sip-sdp… Flemming Andreasen
- Re: [MMUSIC] Empty candidate lists in ice-sip-sdp… Suhas Nandakumar