Audio Fax Not Allowed On Channel And T.38 Negotiation Failed

FFA SendFax rejects T.38 reINVITE (488 Not acceptable here)

https://gmane.comp.telephony.pbx.asterisk.user.narkive.com/DmkaLnJe/ffa-sendfax-rejects-t-38-reinvite-488-not-acceptable-here

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? What you can do is read the documentation. The built-in help for the

T.38によるFax送受信失敗「refused to negotiate T.38 …

https://groups.google.com/g/asterisk-ug/c/ByHhfpomeh4

Problem with receive fax, FAXSTATUS=FAILED LICENSE ...

https://community.freepbx.org/t/problem-with-receive-fax-faxstatus-failed-license-exceeded/8171

[Apr 13 15:29:42] WARNING[6852] res_fax.c: channel ‘SIP/1-pstn-00000007’ refused to negotiate T.38 [Apr 13 15:29:42] WARNING[6852] res_fax.c: Audio FAX not allowed on channel ‘SIP/1-pstn-00000007’ and T.38 negotiation failed; aborting.

Problem with PJSIP and FAX - Asterisk SIP - Asterisk Community

https://community.asterisk.org/t/problem-with-pjsip-and-fax/73143

WARNING[3160][C-00000001]: res_fax.c:4670 acf_faxopt_write: channel 'PJSIP/ENDPOINT-00000001' set FAXOPT(filename) to '/tmp/fax.tif' is unhandled! WARNING[3160][C-00000001]: res_fax.c:2508 sendfax_t38_init: Audio FAX not allowed on channel 'PJSIP/ENDPOINT-00000001' and T.38 negotiation failed; aborting.

ReceiveFAX problem - Asterisk Support - Asterisk Community

https://community.asterisk.org/t/receivefax-problem/33505

[Dec 9 11:11:49] WARNING[14301]: res_fax.c:1368 receivefax_t38_init: channel ‘SIP/xxxxxxxxxx-00000002’ refused to negotiate T.38 [Dec 9 11:11:49] WARNING[14301]: res_fax.c:1389 receivefax_t38_init: Audio FAX not allowed on channel ‘SIP/194.6.238.81-00000002’ and T.38 negotiation failed; aborting.

Asterisk PBX — T.38 fax between ATA's and Asterisk and ...

https://www.spinics.net/lists/asterisk/msg130811.html

To provide a reliable fax solution for users connected to a Asterisk 1.6.2.6 server i have tested a few T.38 capable ATA's: - Patton M-ATA - Grandstream HandyTone 486

SIP - Asterisk: The Definitive Guide (3rd edition)

http://www.asteriskdocs.org/en/2nd_Edition/asterisk-book-html-chunk/asterisk-APP-A-SECT-2.html

Asterisk cannot currently originate or terminate T.38 fax calls; it can only passthrough UDPTL from one device to another. tos_sip , tos_audio , and tos_video Asterisk can set the TOS bits in the IP header to help improve performance on routers …

Fax Receive not working - General Help - FreePBX Community ...

https://community.freepbx.org/t/fax-receive-not-working/35687

sumitk 2016-06-29 13:38:09 UTC #1. Hello, I am trying to configure fax receive on our FeerPBX system. Current setup is as below -. One test extension has fax option enabled with email address. Inbound Route for FAX DID configured to send fax on ext number. Detect Faxes is set to No. ( Tried with set it Yes also but didn’t work)