Alcatel Unleashed

I am trying to configure an audiocodes MP204R with an OXE 12.0 to connect an analog Fax.
Fax transmission is failing. Has anyone tried to configure these audiocodes MP204x ?

I was able to make phone calls behind the audiocodes though.

User is created as SIP device.
SIP device is registered successfully.
T38 enabled on the audiocodes.
AAPP shows no information on audiocodes 20x, only MP11x are supported for fax.

SIP trace shows no T38 INVITE in SIP messages

SIP 200 is not acknowledged on 10.8.100.100.
ANd check which "Fax Transport Mode" is set in MP204.

On the MP204, T38 is set for Fax transport

OK.
So check why "SIP 200 OK" is not acknowledged by 10.8.100.100.

Thanks