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Re: [rtcweb] Replacing a=extmap mapping in re-offer, is it legal?

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 07 August 2017 18:05 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Iñaki Baz Castillo <ibc@aliax.net>
CC: "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] Replacing a=extmap mapping in re-offer, is it legal?
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Date: Mon, 07 Aug 2017 18:04:31 +0000
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Subject: Re: [rtcweb] Replacing a=extmap mapping in re-offer, is it legal?
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Hi,

>> My assumption is that it by default is always allowed to re-negotiate SDP attribute values. And, if it's not, it should be explicitly indicated.
>
> SDP O/A is really error prune. This must end. It cannot happen that, for every renegotiation (which may be it just wants to add/remove a
> track) everything regarding ICE, DTLS, codecs. extmap, etc etc must be re-inspected.

All m- lines obviously need to be included in each re-offer (unless we progress draft-pof-pan), but one can always define that if an attribute is not included in a re-offer the previous value apply.

In this case, however, I don't think everything-must-be-re-inspected is the issue. The issue is whether it's allowed to change the attribute value mapping to begin with.

Regards,

Christer

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