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T.38 fax functionality is included in mod_spandsp. 

Loopback channel

 Loopback/ channels: T.38 pass-through can *NOT* be used with the loopback/ endpoint.

T.38 Passthru

 T.38 Passthru: As of v1.6, t38_passthru=true can *NOT* be used if fax_enable_t38 is not also true.

Use Cases

Sofia profile parameters


See Also