[asterisk-users] FaxIn problems

[srinivas Antarvedi]

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