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Rightfax with SIP inside the SDP there is no DTMF attribute faxes fail outbound

RightFax sending fax across SIP Trunk to CallManager 8.5.1 that has Device > Trunk (SIP) to 2811 (Branch Router with PRI) that have Early Offer.

Faxes fail outbound. Seeing CallManager Software MTP being invoked in ccm trace files;

“RigthFax doesn't support any type of DTMF, whereas the SIP Trunk supports

RFC2833, the CUCM understands this as a mismatch and allocates the MTP:

MTP_DHSCCMSUB4. Below the initial INVITE coming from Rightfax where you can

see inside the SDP there is no DTMF attribute”

Anyone aware of this and if RightFax has a fix for RightFax to include DTMF attributes in their SIP SDPs so MTP doesn’t get invoked?

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