2011/3/31 Olle E. Johansson <[email protected]>:
> If you are sending only ringback, I would recommend sending 180 with SDP
> instead of 183. If you're sending 183, I can't move my state machine to
> ringing state, which would help a lot of 3rd party apps. If you send ringback
> in 183 - they won't notice the ringing and would see the call going from
> calling state directly to answer, which is confusing. Sending ringback with
> 183 and not sending 180 is a problem for many apps.
>
> Use 183 only if you have an operator message to play. Otherwise, add SDP to
> the 180 Ringing.
Hi Olle. So you propose that ringback (just pure ringback with no
voice announcement) should be always sent in a 180 response (with or
without SDP, as usually SIP phones generate 180 with no SDP, of
course).
And just use 183 (always with SDP for sure) when the media contains an
announcement ("the number you are calling is not available" and so).
Am I right?
--
Iñaki Baz Castillo
<[email protected]>
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