A call hold is achieved via an offer/answer exchange. There is nothing
that says an offer/answer must make only a certain kind of change - many
kinds of changes may be made at the same time. So the change in
directionality that is typically associated with going on/off hold may
be done alone, or may be combined with changing the address/port.
Paul
Vick, Steven wrote:
> Hi,
>
> When a call hold is initiated with sendonly, can the port change when
> the media stream resumes with sendrcv? I believe the original port
> number assigned will not change due to using it as a base for sending
> RTCP reports, but I am unsure.
>
> Hopefully, this makes sense. I was looking at rfc3264 and there does not
> seem to be a clear indication of this.
>
> Thanks,
>
> Steve
>
>
>
>
>
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