DynamicRTP-Type-98
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.
I have my codecs set up in FS as global_codec_prefs=G7221 <at> 32000h,G7221 <at> 16000h,G722,PCMU,PCMA,GSM
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?
Here's what the Media Description portion looks like when calling extension to extension:
Media Description, name and address (m): audio 10140 RTP/AVP 0 98 99 9 8 3 101 13
Media Type: audio
Media Port: 10140
Media Protocol: RTP/AVP
Media Format: ITU-T G.711 PCMU
Media Format: DynamicRTP-Type-98
Media Format: DynamicRTP-Type-99
Media Format: ITU-T G.722
Media Format: ITU-T G.711 PCMA
Media Format: GSM 06.10
Media Format: DynamicRTP-Type-101
Media Format: Comfort noise
Here's what the Media Description portion looks like when mod_callcenter initiates the call:
Media Description, name and address (m): audio 12606 RTP/AVP 98 99 9 0 8 3 101 13
Media Type: audio
Media Port: 12606
Media Protocol: RTP/AVP
Media Format: DynamicRTP-Type-98
Media Format: DynamicRTP-Type-99
Media Format: ITU-T G.722
Media Format: ITU-T G.711 PCMU
Media Format: ITU-T G.711 PCMA
Media Format: GSM 06.10
Media Format: DynamicRTP-Type-101
Media Format: Comfort noise
Thanks!
-Troy
<div>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">global_codec_prefs=G7221 <at> 32000h,G7221 <at> 16000h,G722,PCMU,PCMA,GSM</span>
</div>
<div><span class="Apple-style-span"><br></span></div>
<div><span class="Apple-style-span">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></div>
<div><span class="Apple-style-span"><br></span></div>
<div><span class="Apple-style-span"><br></span></div>
<div><span class="Apple-style-span"><br></span></div>
<div><span class="Apple-style-span">Here's what the Media Description portion looks like when calling extension to extension:</span></div>
<div><span class="Apple-style-span"><br></span></div>
<div><span class="Apple-style-span"><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></div>
<div><span class="Apple-style-span"><br></span></div>
<div><span class="Apple-style-span">Thanks!</span></div>
<div><span class="Apple-style-span"><br></span></div>
<div><span class="Apple-style-span">-Troy</span></div>
<div><span class="Apple-style-span"><br></span></div>
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