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Thanks to Pau (the original person to pose the question on this list), it's fixed. The firewall was getting in the way. I needed to open up UDP ports 10000 to 20000 for RTP traffic.<BR>
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See the following for more info:<BR>
<A HREF="http://www.voip-info.org/tiki-index.php?page=Asterisk%20config%20rtp.conf">http://www.voip-info.org/tiki-index.php?page=Asterisk%20config%20rtp.conf</A><BR>
<A HREF="http://www.voip-info.org/wiki-Asterisk+firewall+rules">http://www.voip-info.org/wiki-Asterisk+firewall+rules</A>
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