i have a setup below:
Mitel PBX<----->SIP Trunk<----->(LAN)Adtran908e(WAN)<----->SIP Trunk<---->Third Party SIP Service Provider.
i am sending Fax over T38 from our PBX to Third party through Adtran as shown above. But it is not working. Fax over G711 is working fine.
So can you please let me know for Sending FAX Do i need to do some extra Configuration on Adtran? Many Thanks.
This guide will show you how to configure it:
If not working then prob the provider doesn’t support it.
DO the following debugs, then do a t38 fax and post as results as text file attachment. Make sure your ssh/telnet client has large buffer to catch all the debug so that it is not cut off.
Debug sip stack mes
Debug voice verbose
Debug sip cldu