Re: [rtcweb] JSEP: Relaxing SDP O/A rules?

Christer Holmberg <> Thu, 04 October 2012 09:56 UTC

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From: Christer Holmberg <>
To: Martin Thomson <>
Date: Thu, 4 Oct 2012 11:56:22 +0200
Thread-Topic: [rtcweb] JSEP: Relaxing SDP O/A rules?
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Subject: Re: [rtcweb] JSEP: Relaxing SDP O/A rules?
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>>         "As in [RFC3264], an offerer can send an offer, and update it 
>> as long as it has not been answered."
>> That is not true. In order to update an offer (before it has been 
>> answered), one needs to cancel the previous offer.
> This might be OK if it were to include the fact that any outstanding offer is implicitly cancelled.

Sure. My issue was about the RFC 3264 claim. It's one of the "relaxes" we would have to specify ourselves.

> Note that it is not clear how the current API could be used to cancel an offer.  Various suggestions include passing a null offer or by setting the local (or remote?) description to a previous offer.

I assume that setting the description to a previous offer, from an API perspective, is the same as updating the offer with something new.