[SIPForum-discussion] IMS call: Answer just when 180 is sent out

Gopalarathnam Sambasivan s.gopalarathnam at gmail.com
Tue Aug 21 13:33:57 UTC 2007

Hello All,
Just after the moment 180 ringing is sent in a scenario with require and
supported 100rel, state to be waiting for PRACK
If terminating side answers the call (200 OK), what will happen? what is the
expected behaviour?
What about SDP negotiation with PRACK in this case?

Please tell me the sections of RFC/TS which describes this scenario.

Thanks in Advance.

Best Regards,
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