[asterisk-bugs] [JIRA] Created: (ASTERISK-20247) dialing through chan_local breaks t38 fax

[Rusty Newton (JIRA)]

dialing through chan_local breaks t38 fax
-----------------------------------------

                 Key: ASTERISK-20247
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20247
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_local
    Affects Versions: 1.8.15.0
            Reporter: Walter Doekes


Marked as regression, because this still works in 1.6.2.x.

Consider the following dialplan:
{noformat}
[default]
exten => s,1,Dial(Local/fax at default)

exten => fax,1,NoOp()
;     same => n,Answer()
;     same => n,Playback(silence/1)
     same => n,ReceiveFAX(/tmp/abc.tiff)
     same => n,Hangup()
{noformat}
with the following sip.conf:
{noformat}
[general]
t38pt_udptl=yes
{noformat}

If you attempt to send a fax to extension 's', you get this:
{noformat}
[Aug 14 17:21:34] ERROR[28450]: res_fax.c:1071 set_fax_t38_caps: channel 'Local/fax at default-962f;2' is in an unsupported T.38 negotiation state, cannot continue.
{noformat}

If you send a fax to 'fax' directly, things work as expected.

A patch that fixes the behaviour is attached, and reviewboard item will be created.


(If we enable the Playback, we get a warning: "file.c: Unexpected control subclass '24'"
but that doesn't alter the rest of the behaviour.)


Kind regards,
Walter Doekes
OSSO B.V.

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