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SIPREC Protocol (draft-ietf-siprec-protocol-06)

SIPREC Protocol (draft-ietf-siprec-protocol-06). August 3, 2012 IETF 84. Authors: L. Portman, H. Lum, A. Johnston, A. Hutton, C. Eckel. Changes since last meeting. Draft-ietf-siprec-protocol-04 Merged draft-eckel-siprec-rtp-rec-03 to Section 8 - RTP Handling Draft-ietf-siprec-protocol-05

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SIPREC Protocol (draft-ietf-siprec-protocol-06)

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  1. SIPRECProtocol(draft-ietf-siprec-protocol-06) August 3, 2012 IETF 84 Authors: L. Portman, H. Lum, A. Johnston, A. Hutton, C. Eckel

  2. Changes since last meeting • Draft-ietf-siprec-protocol-04 • Merged draft-eckel-siprec-rtp-rec-03 to Section 8 - RTP Handling • Draft-ietf-siprec-protocol-05 • Editorial changes • Draft-ietf-siprec-protocol-06 • Changes in RTP section

  3. Changes since last meeting (1) • Many editorial changes • Improved introduction and overview of operations

  4. Changes since last meeting (2) • Strengthen statements on metadata usage • The SRC MUST deliver metadata to the SRS in a recording session • Metadata SHOULD be provided by the SRC in the initial INVITE request

  5. Changes since last meeting (3) • Clarifications on recording preference • The recording preference attribute is a declaration by the recording-aware UA of its recording preference. • The SRC is not obligated to honor a recording preference provided by a UA, as it is merely an indication of a preference, not a direct command or request to start or stop recording.

  6. Changes since last meeting (4) • Recording-aware UA MUST (previously SHOULD) indicate recording awareness and include option tag “record-aware” the initial INVITE request or response

  7. Todo (1) • Re-allocate text in section 11 with re-organized headings • SIP Handling • Procedures at SRC, SRS, record-aware UA • SDP Handling • Procedures at SRC, SRS, record-aware UA • RTP/RTCP Handling • Metadata

  8. Todo (2) • Can we interpret +sip.src feature tag in a CS that the user agent will act as the role of an SRC?

  9. Todo (3) • Tighten up security section • Require SRC and SRS to mutually authenticate each other in the same administrative domain? • Should we specify SRTP keying mechanism(s)? If so, which ones?

  10. Changes to RTP Recommendations • draft-ietf-siprec-protocol-04 • Incorporated draft-eckel-siprec-rtp-rec-03 into section 7 • draft-ietf-siprec-protocol-05 • Editorial changes • draft-ietf-siprec-protocol-06 • Expand recommendations for UA • Separate RTP roles of SRC within CS vs. RS • RTP session usage by SRC IETF 84 SIPREC WG Meeting, Aug. 2, 2012

  11. SRC Using Multiple m-lines SRS • CS CNAME -> RS CNAME • CS SSRCs -> RS SSRCs SSRC Aa SSRC Av SSRC Ba SSRC Bv UA-A (CNAME-A) SRC (CNAME-A, CNAME-B) UA-B (CNAME-B) SSRC Ba SSRC Aa SSRC Bv SSRC Av • If SRS does not support, it rejects one or more m-lines, and SRC might choose another option.

  12. SRC Using SSRC Multiplexing SRS • CS CNAME -> RS CNAME • CS SSRCs -> RS SSRCs SSRC SAa SSRC SBa SSRC Sav SSRC SBv UA-A (CNAME-A) SRC (CNAME-S) UA-B (CNAME-B) SSRC Ba SSRC Aa SSRC Bv SSRC Av • If SRS does not support, SRC finds out through RTCP receiver reports and might choose another option • SRC may need to rewrite SSRCs to avoid collisions • SRS relies on metadata as CNAME is not preserved

  13. SRC Using Mixing SRS • CS CNAME -> RS CNAME • CS SSRCs -> RS CSRCs SSRC Sa, CSRC Aa,Ba SSRC Sv, CSRC Av,Bv UA-A (CNAME-A) SRC (CNAME-S, CNAME-A, CNAME-B) UA-B (CNAME-B) SSRC Ba SSRC Aa SSRC Bv SSRC Av • If SRS does not support CSRC, it relies on metadata

  14. TODO • RTP Session Usage • Should any specific RTP session usage be recommended or prohibited? • SSRC Multiplexing is the most problematic • What happens if UA is sending mixed stream already to SRC? • SRTP/Keying Mechanism • Recommend EKT as suggested by Richard and presented by Dan in RTCWEB at IETF 83? • Correlation between metadata and RTP? • CNAME/SDES/SSRC/CSRC may/may not be used by UAs

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