Add T.38 Fax capabilities in Asterisk 13 and Freebx 12

faxunoworkFax in Voip Env….. Joy and pain….

In this post I’ll show how to configure Asterisk 13/FreePbx 12 to use T.38 Fax capabilities to receive fax using SpanDSP (FFA not work in Asterisk 13….).

IMHO when possible is better configure Asterisk Fax system to use T.38 when possible instead alaw or other codec.

To transmit fax you can see my post.
Asterisk Mail2Fax using FFA in poor man style ! (linkografia)

To install and configure SpanDSP you can read my post
Add Fax capabilities in Asterisk >=13 (linkografia) Continue reading

Fax & Voip – Part 2/3 – From Vad to Clock……

fax-machineCodec Translation
I have already mentioned before. In the path caller->called codecs can change several times, and every transformation can introduce distortion and delay.

To minimize fax issues all the legs involved must be using the same codec to avoid codec translation. It is really important the kind of codec: you must use in all the path alaw or ulaw ! Continue reading