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If in the middle of a SIP call between A and B, after the
initial INV/OK/ACK,
A sends an INV w/o SDP to B, how is B supposed to react to it
?
For example:
A (audio,g711Ulaw, port=77777) <---- Ongoing SIP call
----> B(audio, g711Ulaw, port=20000)
Now A sends an INV no sdp to B. B replies with the same
session parameters as before.
However in the ACK back, A changes the port of the SDP
session. Is that allowed ?
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