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Re: [rtcweb] Relaxing SDP O/A (was RE: Agenda requests for Atlanta meeting)

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 18 October 2012 18:28 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "'Dale R. Worley'" <worley@ariadne.com>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] Relaxing SDP O/A (was RE: Agenda requests for Atlanta meeting)
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Date: Thu, 18 Oct 2012 18:27:59 +0000
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References: <AE1A6B5FD507DC4FB3C5166F3A05A484160ED478@tk5ex14mbxc272.redmond.corp.microsoft.com> (matthew.kaufman@skype.net) <201210181817.q9IIH3Vm4836109@shell01.TheWorld.com>
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Subject: Re: [rtcweb] Relaxing SDP O/A (was RE: Agenda requests for Atlanta meeting)
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Hi, 

>> The JSEP API enforces no such rules. If you want to change the API to 
>> bring it into compliance with *just this section* of 3264, it would 
>> need all sorts of changes...
>
>I'm not familiar with the details of JSEP, but on general architectural principles, my suspicion is that the key regarding interworking with SIP is not whether a JSEP-using application can send offers at times that the 3264 
>offer/answer model forbids it, but rather whether JSEP/WebRTC can *reject* an offer.
>
>Certainly in SIP, a new offer presented in a re-INVITE or UPDATE request can be rejected by the other UA by returning a failure response.  Any WebRTC protocol that can interwork smoothly with SIP will require this capability.
>
>Given that, if the JSEP model permits an application to send offers at times when SIP does not, the WebRTC/SIP gateway/server can immediately send rejection of such offers back to the client, without sending a SIP request containing 
>the offer.

For sure it must be possible to reject things which are not allowed by the state machnine.

The issue, however, is that the JSUP SDP O/A state machine currently does allow things which are not alligned with 3264.

Regards,

Christer

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