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Re: [MMUSIC] Draft new version: draft-holmberg-mmusic-sdp-dtls-01

Roman Shpount <roman@telurix.com> Sun, 21 June 2015 03:45 UTC

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Date: Sat, 20 Jun 2015 23:45:02 -0400
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From: Roman Shpount <roman@telurix.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Subject: Re: [MMUSIC] Draft new version: draft-holmberg-mmusic-sdp-dtls-01
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On Sat, Jun 20, 2015 at 6:05 PM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

> > - if the answer has connection:new and the offer didn't have new
> >   transport parameters, then the answer must have new ones.
>
> Yes.
>

One thing to keep in mind here, that unless ICE restart was initiated by
the offering side (i.e. it had a different ufrag/pwd even if ti specified
connection:exisiting), answering side cannot allocate a new transport.
Answering side is simply not allowed to respond with a new ufrag/pwd unless
new ufrag/pwd was used in the offer. In cases where offer has the same
ufrag/pwd, answering side must use connection:existing and issue a new
offer to setup new transport and new DTLS association.

_____________
Roman Shpount

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