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<p class="MsoNormal"><span style="color:#1F497D">I did some more troubleshooting eliminating G722 just in case there was an issue with transcoding / MTP which has resulted in a slightly different SDP but resume still doesn’t work. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Full sip dialog: <a href="https://drive.google.com/open?id=0B6XOeEMvID0vZVdOV2NzM3NJZGM">
https://drive.google.com/open?id=0B6XOeEMvID0vZVdOV2NzM3NJZGM</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Initial call setup appears to be correct. CUCM sends an early offer to Asterisk with SDP, Asterisk responds with a 200 OK with SDP and a=sendrecv.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">When I place the call on HOLD the CUCM sends a delayed offer INVITE to Asterisk:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="color:#1F497D">Asterisk responds with a 200 OK containing the SDP with a=sendrecv<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="color:#1F497D">CUCM ACKS with an SDP containing a=sendonly<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">When I resume the call the CUCM sends a delayed offer INVITE to Asterisk:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span style="color:red">Asterisk responds with a 200 OK containing the SDP with a=recvonly<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:red"> CUCM ACKS with an SDP containing a=sendonly<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I may be missing or interpreting something incorrectly but that does not right for a RESUME scenario.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Per RFC32645 the CUCM is responding in one of the two ways permitted:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<pre><span style="font-family:"Calibri","sans-serif";color:#1F497D">“</span><span style="color:black">If a stream is offered as sendonly, the corresponding stream MUST be<o:p></o:p></span></pre>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> marked as recvonly or inactive in the answer. If a media stream is<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> listed as recvonly in the offer, the answer MUST be marked as<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> sendonly or inactive in the answer.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">“<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Is this a bug or am I wrong in my interpretation of the dialog?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:black">Robert McGilvray<br>
</span></b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#1F497D">o: 914 293 3584</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Robert McGilvray
<br>
<b>Sent:</b> Thursday, March 17, 2016 12:55 PM<br>
<b>To:</b> 'asterisk-users@lists.digium.com'<br>
<b>Subject:</b> Hold/Resume no audio - Asterisk 13.7.2 / PJSIP 2.4.5 / CUCM 8.6.2<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We currently have a production Asterisk box running 1.8.20.1 which uses MeetMe and chan_sip for conferences. I have been testing the new versions of Asterisk with PJSIP and ConfBridge but have run into an issue which is preventing us from
moving forward. Everything works fine until a call is placed on hold, after resuming the call the user cannot hear audio from the bridge. The same thing works perfectly with 1.8.20.1.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The scenario is: Cisco 8845 SIP (G722) -> CUCM 8.6.2 (also tested 10.5, same issue) - > SIP trunk to Asterisk 13.7.2 PJSIP with delayed offer -> ConfBridge.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tcpdump reveals Asterisk is sending the RTP to the endpoint so I suspect we’re dealing with a bug / interop issue with the culprit possibly being a=inactive lines in the SDP.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve included a link (on drive) to two separate SIP traces, one using ngrep and the other is the output of pjsip logging and the relevant sections of my pjsip.conf<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="https://drive.google.com/folderview?id=0B6XOeEMvID0vX2FxTXNkZWlodWM&usp=sharing">https://drive.google.com/folderview?id=0B6XOeEMvID0vX2FxTXNkZWlodWM&usp=sharing</a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anyone offer some insight?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">BobM<o:p></o:p></p>
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