Fortinsky Michael wrote:
I am trying to understand how call waiting is done in SIP.
Assume the following scenario:
A and B are already involved in a call. C calls B, and B has call waiting. B's phone supports call waiting and notifies B of the incoming call from C.
My question is the following: Will C get any indication that the call to B is a call waiting call?
Or, in other words, is there any standard way in SIP to indicate in the backwards direction (from B to C) that the call is a call waiting call?
I thing you could expect C to receive a 18x response. Most likely a 180, but conceivably B's phone might return a 182. Of course there also could be early media from B to C, but that would be strictly optional.
What the *user* of C gets a function of what B did and how it chooses to render that. There are no responses from B that C can interpret as unambiguously indicating call waiting.
I think what *I* would expect is simply that C would hear ringback.
Paul
If there is no "standard" way, is there a "de facto standard" convention that is used?
Thanks.
Mike
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