Hi,
Now when we agreed on a way on how to solve the re-INVITE fallback issue, one remaining open issue in the offer-answer draft is how to reject SDP offers sent in PRACKs.
I would like to collect ideas on how it could be done.
NOTE: At this point I DO NOT want to discuss the pros/cons of different alternatives, their impacts on existing normative text, or whether they work in the first place, but simply do some brainstorming :)
Some ideas:
- Reply 200 OK without SDP answer
- Reply with 4xx responses, indicating that the PRACK itself was ok, but the SDP offer was rejected
- Reply 200 OK with "dummy" SDP answer, then immediately send UPDATE with fallback SDP offer
- Do not use PRACK for offer/answer in the first place
- Stop using 100rel all together (Dean's proposal in the War On Forking)
Some more?
Personally I don't see a make-sure-you-send-an-offer-which-will-not-be-rejected alternative as feasible, because the UAS may want to reject the offer based on other circumstances (e.g. overload).
Regards,
Christer
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