[asterisk-users] Incoming Fax Issue with Asterisk 11.7 and Digium Fax

[Clemens Leu]

Larry Moore <lmoore <at> omninet.net.au> writes:

> 
> sip.conf
> 
> [general]
> faxdetect=t38
> 
> [sipcall.ch]
> directmedia=no
> 
> In extensions.conf change Wait(2) to Wait(5), if your VSP sends you a 
> T.38 re-invite this will trigger the switch to the Fax extension.
> 
> If this proves successful you can work on removing the Wait() from your 
> dialplan as Asterisk will remain in the audio path and should 
> successfully switch to the fax extension if extension 200 or 201 answer 
> a call that happens to be a fax.
> 
> Larry.
> 


Hi to all

Sorry to bump this old thread. Well, I found a while ago finally the reason
why T.38 doesn't work in conjunction with Swiss VoIP provider sipcall.

Despite T.38 is stated as "supported", that provider does NOT support T.38.
Their T.38 gateway has some fundamental negotiation problems, - it "exceeds
the T4 timer of the T.30 protocol". Therefore, T.38 faxing does not work.
http://wiki.innovaphone.com/index.php?title=Howto:Sipcall_business_-_SIP_Provider_Compatibility_Test

Sipcall has confirmed me that they work now on a solution. Will see...

Kind regards,

Clemens