outbound fax over t38 gateway can't pass

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Hello!

I have problems with outbound faxes with asterisk 10.2 t38 gateway.

There is asterisk box, connected to panasonic kx-td500 over PRI link with TE122.

If we try to send fax with following path:

panasonic 500 extension fax machine panasonic500-> asterisk-> ooh323-> cisco 3845-> fax machine

fax can't pass. always reproducable.

as I see in tcpdump produced dump fax machines tries to connect on 9600 and failed, no attempt to down speed.

If I send fax in path
panasonic 500 extension fax machine -> asterisk (ReceiveFAX) it is received successefully all the time.

If I send fax from asterisk with SendFax as following:

asterisk(SendFax) -> panasonic500->asterisk-> ooh323-> cisco 3845...-> fax machine
it always passes.
Usually on 7200, sometimes on 4800.

So ooh323 works OK, fax part works OK, t38 works OK, but not with fax machine (we tested to different).

Inbound faxes in reverse direction, i.e.
fax machine...cisco3845-> ooh323 -> asterisk -> panasonic -> fax machine
always pass on 7200.


More info is here https://issues.asterisk.org/jira/browse/ASTERISK-19436

Bug report was closed because not a bug :-)

Could you help me solve this problem?

Thank you!

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