SIP Info Framework draft-ietf-sip-info-events-03 Eric Burger - - PowerPoint PPT Presentation

SIP Info Framework

draft-ietf-sip-info-events-03 Eric Burger Hadriel Kaplan Christer Holmberg

March 2009 1 IETF 74 - San Francisco, CA, USA

Changes on List

• Fix up all occurrences of “dialog mumble”

with “dialog parameters”

• Table 1 has archaic references to 2543
• Clarify language for overlapping INFOs

and the “nil” package

• Now for Open Issues

March 2009 2 IETF 74 - San Francisco, CA, USA

Get a 489, can all still be fine?

• Option 1: Tear down dialog

Something is hopelessly broken, give up

• Option 2: ignore it

– We say INFO does not change dialog state, and a 489 tearing down dialog changes state – But, handling 489 differently for INFO makes INFO “special” – But what if I said “package X is OK” in an INVITE, but there is glare between you sending an INFO from package X and my dropping X in my ACK?

March 2009 3 IETF 74 - San Francisco, CA, USA

Response Messages

• All agree on INVITE, UPDATE, ACK,

101-299, 300-699

• Probably sensible to exclude 100 from

Recv-Info processing calculation. Thoughts?

• What about PRACK/PRACK 2xx?
• What about REFER/REFER 2xx?
• Missing Recv-Info, empty Recv-Info,

Recv-Info: nil

March 2009 4 IETF 74 - San Francisco, CA, USA