The strangest problem ever seen with RxFax

Asterisk Asterisk Support
1

Hello

I think RxFax si buggy. Look at the following three tests:

  1. A fax machine calls my voip trunk (through the pstn network).
    After answer I forward the call to the fax hardware and all is ok.

  2. A fax machine calls my voip trunk (through the pstn network).
    After answer I forward the call to the fax software (I use #299) and it fails. Sound signals are sent to the caller at faster speed then expected and with intermittent tones rather then with a continue tone (!!!)

  3. A fax machine calls my zap (pstn) trunk.
    After answer I forward the call to the fax software (I use #299) and all is ok. (So I can exclude that the problem at 2) is the Voip compression)

My fax software configuration is:

[from-internal-custom]
…
exten => 299,1,Goto(ext-fax,s,1)

Summary of my tests:

fax call --> voip trunk --> fax hw --> OK
fax call --> voip trunk --> fax sw --> Fails
fax call --> zap (pstn) trunk --> fax sw --> OK

2

faxing over IP is still buggy. some people have it working prerfectly, for others it’s a real no-no. YMMV.