[asterisk-users] how many UDP ports is required for 1 call

[Bruce B]

>
> <virbhati at 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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