T38 Faxing and T38pt_udptl= values and devices #2

[lorn10]

Well, - we have now 2019 and I am happy to note here that my FoIP (faxing over IP) is working meanwhile stable and reliable.

It looks that my provider Sipcall.ch has resolved their T.38 issues. Furthermore I was able to find out the correct T.38 faxing parameters. And finally I have also discovered a strange “Free Fax For Asterisk” installation bug. Also this problem needed his time to be solved…

So after five years, this story has come finally to an end!

More detailed information can be found at the following thread:

t38 Fax detection

Well, really sorry to warm up this old, old, thread. Here follows my conclusion how I have fixed that, and several other T.38 related issues, - maybe this will help also others with similar problems. Regarding the T.38 fax detection, - the best solution is simply to not use it. If you have a phone number dedicated to faxing-only then disable fax detection on the inbound route and send the call directly to the “Fax Recipient”. For me this had worked perfectly. By the way, it is also str…