Sctp in sdp draft loreto mmusic sctp sdp 07
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SCTP in SDP draft-loreto-mmusic-sctp-sdp-07. Salvatore Loreto. Prague, Czech Republic Friday, April 1, 2011. Overview. how to express, in SDP, media transport over SCTP DTLS over SCTP (e.g. for communications privacy). Clarification 1. With SCTP its possible to convey multiple

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SCTP in SDP draft-loreto-mmusic-sctp-sdp-07

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SCTP in SDPdraft-loreto-mmusic-sctp-sdp-07

Salvatore Loreto

Prague, Czech Republic

Friday, April 1, 2011


how to express, in SDP, media transport over

  • SCTP

  • DTLS over SCTP (e.g. for communications privacy)

Clarification 1

With SCTP its possible to convey multiple

streams over the same connection.

So in principle one could use a single SCTP

association for several media streams.

The intent of this draft is for:

only a single media stream using the connection

Open issue 1

  • Is it necessary to know which stream identifier to use for the media stream?

    • convey the stream id in the SDP

    • Define a well-known id

      Suggestion: use stream 0 for everything

Open issue 2: Multihoming

An SCTP endpoint can be Multihomed.

The SCTP endpoints MAY choose to use/adv the main

address all the time (e.g., in the ‘c’ line) and to send a

re-INVITE every time they change that Address.

However not using non-primary paths for retransmission

means not to utilize the multi-homing feature of SCTP for


Open issue 2: Multihoming

How to express non-primary paths in SDP:

  • reuse ICE attributes changing their semantics

    • the candidate line has well-defined semantics and we should probably not overload them with new meanings

    • ICE uses the re-INVITE mechanism…

Open issue 3: NAT

TBD: How to use Interactive Connectivity Establishment (ICE) to establish SCTP streams. …in a different drat?

  • do we want to include in SDP the ability to signal SCTP- over-UDP ?

  • Do we want ICE to only use SCTP over IP candidates, or we ant ICE to use SCTP over UDP candidates as well?

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