Resolved! RightFax T38 with stcapp controlled FAX
I have a RightFax connected to a CUCM v6 through a SIP trunk. VGs are configured for T38 with fallback cisco protocol. Some faxes are connected directed on FXS on VG, and controlled by CUCM via STCAPP service protocol.OK: from RightFax --> Fax Rx/Tx ...