Re: [MMUSIC] Single SCTP usage per SDP session?

[Paul Kyzivat <[e-mail]>]

On 11/26/14 2:00 PM, Christer Holmberg wrote:

> <Raju>
>> Per my understanding, draft-ietf-tsvwg-sctp-dtls-encaps just talks about SCTP over DTLS and allowing multiple SCTP associations, which is perfectly fine.
>> Then it is possible to come up with SCTP-SDP semantics to use that capability.
>> One m= line allowing one SCTP over DTLS limit is fine. Using BUNDLE you can replicate same 4-tuple in multiple m= lines. Then there is only one DTLS association
>> established and multiple SCTP associations over that is possible (one per m= line).
>> If BUNDLE is not used then I believe same 4-tuple on multiple m= lines are NOT possible. This is because, per my understanding, unlike TCP/native-SCTP used under non-
>> ICE environments, in ICE-environments the TCP/UDP port specified is used both as client and server port for DTLS.
>
> Even with BUNDLE, you would have to use the same m= line port value from the beginning, which is not allowed. So, you basically would have to add the additional SCTPoDTLS m= lines once the usage of BUNDLE has been negotiated.

bundle-only would allow you to set this up.

	Thanks,
	Paul