I am assuming everyone else is struggling with OPBX Fax Passthru too. Here is what I found.
T38Ingress--->OPBX---->T38Egress If a call is placed and the T38Egress sends a 200OK with SDP=T38, the OPBX does not pass that on to T38Ingress. However, if a call already in place say with G711 negotiated, then the T38Egress sends a REINVITE (SDP=T38), the OPBX does pass that acress and a T38 Passthrough call does get setup.
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