RTP always uses a random even numbered port, then RTCP will use the next port, which will always be odd numbered. Symmetric RTP only needs two ports, while asymmetric RTP uses four.<br><br><a href="http://www.armware.dk/RFC/rfc/rfc4961.html">http://www.armware.dk/RFC/rfc/rfc4961.html</a><br>
<br><br><br><div class="gmail_quote">On Fri, Jan 14, 2011 at 12:44 PM, Bruce B <span dir="ltr"><<a href="mailto:bruceb444@gmail.com">bruceb444@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I mean part of RTP RFC?<div><div></div><div class="h5"><br><br><div class="gmail_quote">On Fri, Jan 14, 2011 at 2:41 PM, Bruce B <span dir="ltr"><<a href="mailto:bruceb444@gmail.com" target="_blank">bruceb444@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi Everyone,<div><br></div><div>I am just tweaking a pfSense router and learning lots about NAT etc....I noticed that each call uses four UDP port for RTP. Here is an example of port for a call I made:</div><div><br></div>
<div><div>10200</div><div>10201</div><div>10504</div><div>10505</div></div><div><br></div><div>Seems like they are random in pair. I have a restriction of 10000-11000 in my rtp.conf so that makes sense. But why use 4 ports per call? is that part of SIP RFC?</div>
<div><br></div><div>Thanks</div>
</blockquote></div><br>
</div></div><br>--<br>
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