CHANNEL(t38passthrough) Is 0

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I’m trying to get T.38 passthrough working on Asterisk 1.8.18.1. It isn’t working. Calls go through and are answered, but the fax machines are unable to communicate. I checked the value of CHANNEL(t38passthrough) and it seems to always be 0. One side is Level 3 T.38 TN and the other side is an Adtran NetVanta with POTS ports. What would cause Asterisk to not offer t38 passthrough on a channel?

2 thoughts on - CHANNEL(t38passthrough) Is 0

  • Setting directmedia=no does not help. The calls still go through and the fax still fails after switching to T.38.

    —–Original Message—

  • Do you have reinvite allowed? That was an issue on one of my installations if I am remembering correctly. Any debug, logs, confs that would help?

    Thanks, Steve Totaro