> 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 ?
Provide SDP (typically last sent SDP)
and expect SDP in ACK.
> 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 ?
Yes.
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