I tried sending faxes through Zoiper (Zoiper to Zoiper) last week
and the program crashed. After an update it stopped crashing but
still could not send a FAX. I then tried Kapanga (the free version has a limited 30 days FAX sending capability) and it worked. This might be of little use to you since I used Freeswitch with t38 pass-trhough, but my point is : first find a client that supports t38 FAX capabilites that work and then try asterisk. Our company had success sending FAX using t38 through asterisk along time ago so I guess you will get there sooner or later.

Olivier wrote:
Hi,

1. Has anyone got any success when send a TIFF file form one zoiper softphone to another ? I tried using Zoiper 2.18 free edition in windows but I'm seeing 415 Unsupported media replies.

2. Here (http://www.voipinfo.org/wiki/view/Asterisk+T.38), you can read :
"Also, try using:

 t38_udptl=yes
 t38pt_rtp=no
 t38pt_tcp=no

... in the general section of the sip.conf and under the VoIP provider account as well as the fax account. "

But above, you can read
"[general]
t38pt_udptl = yes "

Has this parameter name changed between 1.4 to 1.6 from t38_udptl to t38pt_udptl ? A asterisk remains silent when I add an unknown parameter "foo=bar", it would perfect if someone could point the right name (t38_udptl or t38pt_udptl).

Regards

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