[asterisk-users] FFA SendFax rejects T.38 reINVITE (488 Not acceptable here)

[VoIP Question]

Hello again,

If I set a peer to use G.711 only, they try to process a sent fax in G.711,
but Asterisk doesn't like it:

WARNING[4903]: res_fax.c:1709 sendfax_t38_init: Audio FAX not allowed on
channel 'SIP/Main-0000000a' and T.38 negotiation failed; aborting.

What can I do to enable it?

Thanks,

Michael
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