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

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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  1. SCTP in SDPdraft-loreto-mmusic-sctp-sdp-07 Salvatore Loreto Prague, Czech Republic Friday, April 1, 2011

  2. Overview how to express, in SDP, media transport over • SCTP • DTLS over SCTP (e.g. for communications privacy)

  3. 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

  4. 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

  5. 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 resilience.

  6. 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…

  7. 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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