Hi,
Consider the following call flow:
UAC --------------------- UAS
INVITE ----------->
100 Trying <-----------
183 Progress <-----------
PRACK ------------>
200 PRACK <------------
UPDATE ------------>
200 UPDATE <-----------
200 OK <-----------
Consider the case where the INVITE request has multiple 'm=' lines in the
above call flow.
Now, when an UDPATE request is sent with a codec in the SDP which is not
present in the initial INVITE request, how should the UAS respond in the 200
OK to the INVITE?
For example, INVITE request has 2 'm=' lines with G.711 and G.729 codecs.
And UPDATE request has a single "m=" line with only G.723 codec.
1) Is it ok to have only one "m=" line in the UDPATE request here?
2) If yes, how would the UAS fill up the "m=" lines in the 200 OK response
to the INVITE request?
Thanks,
Jagan
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