Hi,
I just begin work on sip so I am not sure lots of staff. here is one: I got double ringback, it seem one from 180, another from 183, but why this two response occure togather? is it because the proxy fork INVITE to a PSTN phone as well as IP phone? if so, should the proxy forward all the 180/183 back? if so, what a mass at the UA's end, it start a single phone to want to talk to someone, but turn out maybe it could get a meeting there!
Confusing...
Thanks.
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