I am trying to setup an asterisk server as a T38 gateway. Here is the schema:
(telco sip) <—g711–> asterisk 11.25 <----g711—> ipbx
When I use G711 between asterisk and the ipbx, it works. But I want t38 between asterisk and the ipbx. When the IPBX receives a fax in g711 and issues an (re)INVITE for T38, I get an error 488 NOT ACCEPTABLE HERE replied by asterisk 11.25.
For testing purpose, I’ve setup:
(telco sip) <—g711–> asterisk 11.25 <----t38—> asterisk 11.21
and I get the error on the asterisk 11.25:
[Jan 3 22:43:20] ERROR[C-00000003]: res_fax.c:1072 fax_session_new: Could not locate a FAX technology module with capabilities (V21)
[Jan 3 22:43:20] ERROR[C-00000003]: res_fax.c:2569 fax_gateway_new: Can’t create V21 session on chan SIP/telcotrunk-00000006 for T.38 gateway session
[Jan 3 22:43:20] ERROR[C-00000003]: res_fax.c:4108 acf_faxopt_write: Error attaching T.38 gateway to channel SIP/telcotrunk-00000006.
Why is that ?
Thanks for the help