t.38 Re-INVITE rejected by server

Some fax calls to a particular number are failing from multiple 3.101 servers. The server rejects the t.38 Re-INVITE that was sent from my carrier to the server which is then responding with a “488 Not acceptable here”. I’ve tried enabling t.38 passthrough on the server and with the carrier to no avail. Thoughts?

What’s the output of:

asterisk -x"pjsip show endpoint <trunk endpoint>" | grep t38

How do I find the trunk endpoint? And does the vrtual fax device use SIP by default or PJSIP?

asterisk -x"pjsip show endpoints"

[root@xxxx ~]# asterisk -x"pjsip show endpoint 86xxpjsip" | grep t38
t38_udptl : false
t38_udptl_ec : none
t38_udptl_ipv6 : false
t38_udptl_maxdatagram : 0
t38_udptl_nat : false

Where did you enable it?

Go to the Trunk and enable the T38 settings.

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