Hello, I have a question regarding incoming fax to local file (on the Asterisk server). While the fax is received properly (I have the tiff file generated as expected) I get the warning ‘FAX CNG detected but no fax extension’ on the consol.
If the fax is received ok then what ‘fax extension’ does it expect and what should I do there?
Sender -> Public PSTN -> provider -> SIP trunk (configured with G711a) -> Asterisk (13.6.0)
My extension.conf on relevant section is this (obviously this is not production code):
exten => s,1,Answer()
same => n,Verbose(0, Attempt to Receive FAX)
same => n,Set(FAXOPT(gateway)=no)
same => n,ReceiveFax(/var/workspace/testfax.tiff,d)
same => n,Hangup()
and Server*CLI> module show like fax Module Description Use Count Status Support Level res_fax.so Generic FAX Applications 1 Running core res_fax_spandsp.so Spandsp G.711 and T.38 FAX Technologies 0 Running extended
2 modules loaded
Thank you for your assistance,
Kind Regards, Harel Cohen