> > <virbh...@gmail.com> wrote: > >how many UDP ports is required for 1 call. and why . > > If you mean a voice call, it appears that each host must open three > UDP sockets: > > - One to send/receive SIP commands > - Two to receive sound (one for RTP, one for RTCP; The first port is > even, the other is odd) >
This is I think the best answer provided to you so far. The simplest and most relevant I should say. Just to add to that, first port is TCP port and the other two are UDP ports assuming you are using SIP protocol. -Bruce
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