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<div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>This does appear to be a Paetec SIP provider firewall issue that is fixed by setting “Full Duplex Stream” in CCMAdmin > Service Parameters > Advanced Parameters.<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'>Paetec is delivering SIP service inside the MPLS cloud for multiple sites (each site has it’s own CUBE 2951 15.1.3T1, no ip cef) running on centralized CallManager 7.1(5).<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 toggled Full Duplex Stream to False and the far end doesn’t get MoH. Set it to True and it works. Default is False.<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'>Via CallManager packet capture we saw MoH to gateway, at gateway via Embedded Packet Capture we see exported .pcap file showing stream to Paetec IP and heard it playout via Wireshark. Already tried disabling ip cef earlier, but the Full Duplex Stream fixed it. So I’m guessing it’s something with Paetec’s firewall. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></div>
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