<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I noticed a problem with calls originating from the mod_callcenter. The order of the codecs in the Media Description portion of the SDP is different for calls from mod_callcenter than when dialing the extension from another extension. Specifically, ITU-T G.711 PCMU is coming first on calls that work, and DynamicRTP-Type-98 is coming first on those that don't. A Polycom 450 is returning a 488 Not Acceptable Here message on the callcenter calls, and an Aastra 6731i has extremely choppy audio. If I tell the Aastra to only allow G722, all works as expected.<div><br></div><div>I have my codecs set up in FS as <span class="Apple-style-span" style="font-family: Arial, Lucida, 'Lucida Grande', Verdana, sans-serif; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><b>global_codec_prefs=G7221@32000h,G7221@16000h,G722,PCMU,PCMA,GSM</b></span></div><div><span class="Apple-style-span" style="font-family: Arial, Lucida, 'Lucida Grande', Verdana, sans-serif; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><b><br></b></span></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Can anyone explain what DynamicRTP-Type-98 is and why it would be in the SDP when I'm not specifying it in the codec list?</span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Here's what the Media Description portion looks like when calling extension to extension:</span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><div> Media Description, name and address (m): audio 10140 RTP/AVP 0 98 99 9 8 3 101 13</div><div> Media Type: audio</div><div> Media Port: 10140</div><div> Media Protocol: RTP/AVP</div><div> Media Format: ITU-T G.711 PCMU</div><div> Media Format: DynamicRTP-Type-98</div><div> Media Format: DynamicRTP-Type-99</div><div> Media Format: ITU-T G.722</div><div> Media Format: ITU-T G.711 PCMA</div><div> Media Format: GSM 06.10</div><div> Media Format: DynamicRTP-Type-101</div><div> Media Format: Comfort noise</div><div><br></div><div><br></div><div><br></div><div>Here's what the Media Description portion looks like when mod_callcenter initiates the call:</div><div><br></div><div><div> Media Description, name and address (m): audio 12606 RTP/AVP 98 99 9 0 8 3 101 13</div><div> Media Type: audio</div><div> Media Port: 12606</div><div> Media Protocol: RTP/AVP</div><div> Media Format: DynamicRTP-Type-98</div><div> Media Format: DynamicRTP-Type-99</div><div> Media Format: ITU-T G.722</div><div> Media Format: ITU-T G.711 PCMU</div><div> Media Format: ITU-T G.711 PCMA</div><div> Media Format: GSM 06.10</div><div> Media Format: DynamicRTP-Type-101</div><div> Media Format: Comfort noise</div></div><div><br></div></span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Thanks!</span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">-Troy</span></font></div><div><font class="Apple-style-span" face="Arial, Lucida, 'Lucida Grande', Verdana, sans-serif"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></font></div></body></html>