I am using freeswitch to receive fax from DID numbers. But i see most of fax calls being failed due to " Timer T2 expired" and "The call dropped prematurely". I tried to enable fax debug but could not understand why it is happening. 

Could someone please help in out in understanding the reasons of these failures and how to over come these failures.

Using FreeSWITCH Version 1.6.19~64bit ( 64bit)

Best Regards.