I try to pass through fax with t38 from asterisk 126.96.36.199 build on Debian. In sip.conf i have t38pt_udptl = yes and nat=yes.
The scenario is :
Sip-Provider --> (SIP)Asterisk1 --> (SIP)Asterisk2
When an INVITE(g729,g711,t38) is send from the Voip Provider to asterisk 1, then asterisk1 is forwarding the INVITE(t38) to asterisk2.
The question is WHY asterisk1 is sending an INVITE only with t38. Asterisk1 is not answering the call so he does not know if is a fax or a voice call.
Anyone any idea ?
thanks in advance