[asterisk-bugs] [JIRA] (ASTERISK-27962) pjsip / udptl fax passthrough fallback sometimes not working

[Michael Maier (JIRA)]

Michael Maier created ASTERISK-27962:
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             Summary: pjsip / udptl fax passthrough fallback sometimes not working
                 Key: ASTERISK-27962
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27962
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: pjproject/pjsip
    Affects Versions: 13.22.0
         Environment: CentOS 6 / 64 Bit
            Reporter: Michael Maier


A lot of the following log entries can be found in the log:

NOTICE[20870][C-00000024] udptl.c: UDPTL (PJSIP/telekomPJSIP-226-00000050): Transmission error to 217.0.5.183:0: Invalid argument

during receiving a fax. The receiving of the fax fails.

This situation happens, if the following takes place (see attached screenshot):

- inbound fax
- t.38 udptl is activated on the incoming trunk
- the fax device sends a t.38 reinivte
- but the peer doesn't answer with 488 not accepted
- instead the peer sends an INVITE "g711" (see screenshot)
- fax reception is broken from that point.




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