Subject: [MMUSIC] Draft new version: draft-ietf-mmusic-sctp-sdp-17

From: Christer Holmberg <[email-masked]>
Date: Tue, 30 Aug 2016 12:36:34 +0000

Hi,

The new version (-17) of draft-ietf-mmusic-sctp-sdp has finally been submitted.

-The draft now takes draft-dtls-sdp and draft-4572-update into consideration.
-The procedures associated with SCTP/DTLS (DTLS over SCTP) have been removed, as nobody indicated a need to keep them.

When it comes to the management of SCTP associations, DTLS associations and TCP connections, the previous version of the draft took an approach from an SDP attribute perspective. In the new version, the draft takes an approach from an association/connection perspective, describes how each layer is managed and how/if/which SDP attribute impact the association/connection. The text also clarifies that each association/connection is managed independently of each other. For example, it is possible to re-establish an DTLS association without touching the overlaying SCTP association, etc.

NOTE: The draft now says that, since each SCTP endpoint is always ‘active’, and both establish the SCTP association, the SDP ‘setup’ attribute is not used for SCTP. IF someone thinks there is a use-case where a separation of active and passive SCTP endpoint is needed, please bring it to the list. There are no changes to how the SDP setup attribute impact the DTLS roles  (client/server) and the TCP roles (active/passive).

The draft was previously already in WGLC, but due to the changes in the latest version we should probably wait a bit before we continue the WGLC. I encourage everyone to take a look – especially the browser/JSEP folks.

I’d like to give a special Thank You to Roman Shpount, for the input and feedback he has given off-line.

Regards,

Christer