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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>RightFax sending fax across SIP Trunk to CallManager that had Device > Trunks to 2811 that have Early Offer <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Faxes fail. Seeing CallManager Software MTP being invoked.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>“RigthFax doesn't support any type of DTMF, whereas the SIP Trunk supports<o:p></o:p></p><p class=MsoNormal>RFC2833, the CUCM understands this as a mismatch and allocates the MTP:<o:p></o:p></p><p class=MsoNormal>MTP_DHSCCMSUB4. Below the initial INVITE coming from Rightfax where you can<o:p></o:p></p><p class=MsoNormal>see inside the SDP there is no DTMF attribute”<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Anyone aware of this and if RightFax has a fix to for RightFax to include DTMF attributes in their SIP SDPs so MTP doesn’t get invoked?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>