<html>
<head>
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 12pt;
font-family:Calibri
}
--></style></head>
<body class='hmmessage'><div dir='ltr'>I have a situation, where, in some case the ingress pstn call leg is trying to use g.729 (when there is nothing in the gateway that would indicate it's preference).<br><br>Call path when G729 is negotiated:<br><br>PSTN -> h.323(PRI)
dial-peer match -> SIP trunk to Unified Proxy Server - > SIP
Customer Voice Portal -> SIP To vXML Server -> Send SIP invite to
call manager and the SDP contains G729<br><br>Call path when G711 is negotiated:<br><br>PSTN - >h .323(PRI) dial-peer match -> CCM -> ring phone<br><br>- The gateway and IP phone are in the same region and the region is related to itself with G711.<br>- The region of the DP of the SIP trunk is related to the region of the gateway and the region of the phone with G711<br>- The voice class codec on the router only has g711 set as the 1st preference<br>- The matched dial-peer (h.323) for the SIP trunk to CUSP is specifying the voice class codec correctly<br>- The IP phone is a 7962/42<br><br>My question is how and why is the far end negotiating G729? This site does have limited CIR (10 Mbps) and the CVP/vXML servers are in a different geographic location than the gateway/IP phone.<br><br>My thought is that since the IP phone can negotiate G.729, it could be a bandwidth thing where it is just choosing to use the lower bandwidth codec BUT the invite to CCM is coming from CVP. The SDP in the invite shows G729.<br><br>Content-Type: application/sdp<br>App-Info: <<i>vXMLVoiceServerIPAddress</i>:8000:8443><br>v=0<br>o=CiscoSystemsSIP-GW-UserAgent 7410 5486 IN IP4 <i>GatewayIpAddress</i><br>s=SIP Call<br>c=IN IP4 <i>GatewayIpAddress</i><br>t=0 0<br>m=audio 19808 RTP/AVP 0 18 100 101<br>c=IN IP4 <i>GatewayIpAddress</i><br>a=rtpmap:0 PCMU/8000<br>a=rtpmap:18 G729/8000<br>a=fmtp:18 annexb=yes<br>a=rtpmap:100 X-NSE/8000<br>a=fmtp:100 192-194<br>a=rtpmap:101 telephone-event/8000<br>a=fmtp:101 0-16<br><br><br> </div></body>
</html>