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
Thanks for reply.
i will let you know the result.