Asterisk-1.6.0.3 OS-2.6.24.2.dn.p4 kernel-CentOS release 4.6 (Final) libpri-1.6 compatable zaptel-1.6 compatible I have been using the accounts for faxin for faxing. For some of the numbers when i send fax it went through successfully. For some numbers the following error is occuring in asterisk CLI app_fax.c:173 phase_e_handler: Error transmitting fax. result=13: Unexpected message received. app_fax.c:621 transmit: Transmission failed app_fax.c:173 phase_e_handler: Error transmitting fax. result=49: The call dropped prematurely. app_fax.c:618 transmit: Transmission error What might be the problem??? how to debug this issues with the fax in asterisk CLI?? any help is appreciated.. Thanks in advance Srinivas Antarvedi