1. 1 SIPREC Protocol IETF #80 Authors: L. Portman, H. Lum, A. Johnston, A. Hutton

2. Status Currently -03 draft Main topics – Partial Metadata support – Metadata Snapshot support – Multiplexing media – Recording awareness – Recording indications – Recording preferences Open Items 2

3. Partial Metadata Support 3

4. Metadata Snapshot Support INVITE without SDP from SRS to SRC Using UPDATE to request Metadata Snapshot – Possible collision – Does not require additional mechanism (INFO) 4

5. Multiplexing media streams Multiplexing medias for each side on the same RTP stream with different SSRC Benefits – Reducing port numbers – Faster NAT traversal negotiation Require from metadata to map between participant->stream->SSRC – Via CNAME attribute in SDP 5

6. Recording Awareness Session level SDP-attribute – a=recording-aware – If not agreed, in-band media tone will be generated 6

7. Recording Indications “record” session or media level attribute – "a=record: “ indication – indication = "on" / "off" / "paused" 7

8. Recording Preferences “recordpref” session or media level attribute – "a=recordpref:" pref – pref = "record" / "norecord" / "pause" / "resume" 8

9. Open Items Asynchronous vs. Synchronous Error handling – Synchronous SDP Processing – Asynchronous XML processing Session Timer usage Metadata Support Discovery 9

10. 10 Discussion