Description
Have a weird instance here. Using the T38Modem to a particular fax number doesn't go though, but if you send the fax with an analog modem, it does.
I've called the number from my phone and it does seem like the receiving end does pick up, but it takes a bit for the actual Fax Tone to come through. Instead there are a bunch of other clicking noises going on for a bit before the fax tone.
I used the following to start up my modem t38modem -t -o /var/log/T38modem3.log --ptty +/dev/ttyx3 --route fax:.*=sip:<dn>@192.168.1.30:5060 --route t38:.*=sip:<dn>@192.168.1.30:5060 --route modem:.*=sip:<dn>@192.168.1.30:5060 --route sip:.*=fax:<dn> -S udp$*:5063 and tested it with sending a fax to my Zulty's fax line (sip) and to an analog fax line I have available and it does come though. But not to this one particular fax number (out of my control).
Any suggestions?