[asterisk-bugs] [JIRA] (ASTERISK-27424) PJSIP T.38 Re-Invites fail between 2 extensions running Fax Voip FSP Windows Fax Service Provider

[Jared Davison (JIRA)]

Jared Davison created ASTERISK-27424:
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             Summary: PJSIP T.38 Re-Invites fail between 2 extensions running Fax Voip FSP Windows Fax Service Provider
                 Key: ASTERISK-27424
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27424
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_pjsip_session, Resources/res_pjsip_t38
    Affects Versions: 15.1.0
         Environment: 1 x Asterisk server
2 x Windows 10 workstations, 
  each workstation has:
     1. "Windows Fax & Scan" (WFS.exe) 
     2. Fax Voip FSP Windows Fax Service Provider  (FSP)
          (note that virtual machines are not recommended by Voip FSP faq).
          15 Day trial available here: http://www.t38faxvoip.com/fsp/
     3. Wireshark packet capture software running on both Windows computers.
    4. Configure an extension in asterisk for each FSP.

The extensions endpoints in the asterisk pjsip.conf should have the following settings added:
t38_udptl=yes
t38_udptl_ec=redundancy
fax_detect=no
t38_udptl_nat=yes

For debug logging ensure that logger.conf has has debug specified eg.:
console => debug,error,notice,verbose,warning
full => debug,error,notice,verbose,warning

$asterisk -r
freepbx*CLI> core set debug 9
Core debug was OFF and is now 9.
freepbx*CLI> pjsip set logger on
PJSIP Logging enabled

1 .Setup SIP extensions in "Fax Voip FSP Windows Fax Service Provider " software.
   Fax Voip FSP->VOIP->SIP->Registrations
2.Check box Fax Voip FSP->VOIP->SIP->T.38 Fax->T.38 Fax reception -> Switch to T.38 on CNG tone received.

Other scenarios should probably work but this one would be a good starting point.
            Reporter: Jared Davison


Sending a T.38 fax between two extensions running the "Fax Voip FSP Windows Fax Service Provider " on the same Asterisk PBX fails.

My suggestion is to reproduce the scenario of one side sending to the other. 

In Windows Fax and Scan create a fax and send it to the extension on the other computer.

Please see the notes and discussion on the asterisk community forum (see external issue ID) which lead to this case's creation.
https://community.asterisk.org/t/t-38-fax-passthrough-via-using-pjsip-extensions/72632/3



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