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Based on this (regarding the MTP), and the previous SDP audio header; it’s very clear something is changing the DTMF method (which is why MTP is “fixing” it). Non negotiable DTMF can absolutely cause a call to fail, especially faxing (because the other side
effectively won’t “hear” the handshake).
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<div>In your “bad call” SDP, there was no DTMF method listed, whereas your “good call” SDP listed 101 (rtp-nte). In both cases, the codec remained the same (PCMU/8000)<br>
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<div>I would get a SIP message log from every joint in the call leg and look for where DTMF is changing and verify every piece in the call leg (and associated node’s/HA’s of said pieces) all support and agree to the same DTMF method (also verify you’re supporting
at least one OOB DTMF method).</div>
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On Mar 23, 2018, at 12:36, Jonatan Quezada <<a href="mailto:jonatan.quezada@chemeketa.edu">jonatan.quezada@chemeketa.edu</a>> wrote:<br>
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<div dir="ltr">is anyone using the century Link configuration guide for the SIP IQ private on a 4431, . I finally have calls 100 percent of the time but I had to do MTP on the trunk for the CUCM
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<div>my call flow is very simple</div>
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<div>centLiunk---IQ private---- Cube---------CUCM,uccx,Unity, </div>
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<div>trying like mad for fax pass through, </div>
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<div>I have tried multiple combinationsof these:</div>
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<div>voice class codec 1 ---this one is pretty static, I havent changed it</div>
<div> codec preference 1 g711ulaw</div>
<div> codec preference 2 g729r8</div>
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<div>sip profile</div>
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<div>request ANY sdp-header Audio-Attribute modify "a=X-cisco-media:umoh" "" </div>
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<div>voice service voip</div>
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<div> no supplementary-service sip moved-temporarily</div>
<div> redirect ip2ip</div>
<div> fax protocol pass-through g711ulaw</div>
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<div>sip</div>
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<div> midcall-signaling passthru media-change</div>
<div> early-offer forced</div>
<div> privacy-policy passthru</div>
<div> pass-thru subscribe-notify-events all</div>
<div> pass-thru content unsupp</div>
<div> pass-thru content sdp</div>
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<div>I thinking about picking apart my config all together and going strictly off of config example. I had our vendor engineer do ours and its been nothing but head aches. a couple of the huge differences are the DPG references and huge header modification,
What do you guys suggest?</div>
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<div dir="ltr"><font face="arial, helvetica, sans-serif" size="4"><br>
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<div dir="ltr"><font face="arial, helvetica, sans-serif" size="4">Johnny Q</font></div>
<div dir="ltr"><span style="font-family:arial,helvetica,sans-serif;font-size:small">Voice Technology Analyst - TelNet</span><font face="arial, helvetica, sans-serif" size="4"><br>
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<div><font face="arial, helvetica, sans-serif" size="4">Chemeketa Community College</font></div>
<div><span style="font-size:12.8px"><a href="mailto:Johnny.Q@chemeketa.edu" target="_blank">Johnny.Q@chemeketa.edu</a></span></div>
<div><font size="1"><span style="font-family:arial,helvetica,sans-serif">Building 22 Room 131</span><br>
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<div><font face="arial, helvetica, sans-serif" size="1">Work 5033995294</font></div>
<div><font face="arial, helvetica, sans-serif" size="1">Mobile 9712182110</font></div>
<div><span style="font-family:arial,helvetica,sans-serif;font-size:x-small">SIP 5035406686</span><br>
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