Outgoing Fax Uknown Problem (NO carrier)

Hi guys
I am using asterisk hylafax as my faxserver and got 2 sangoma vega 50 8fxo gateways
since I am new to asterisk need your helps badly
I can receive fax on the server
but when sending fax receive this Unknown problem message
I checked the destination number rings and connect but no transfer happens
with a deeper look into the hylafax log file I find out No carrier detect error
can any one help?!

tail /var/spool/hylafax/log/c*

==> c000000295 <==
Apr 28 17:36:56.65: [11669]: <-- [16:ATDT02142693473\r]
Apr 28 17:37:47.57: [11669]: --> [2:]
Apr 28 17:37:47.57: [11669]: SEND FAILED: JOB 51 DEST 02142693473 ERR Unknown problem
Apr 28 17:37:47.57: [11669]: <-- [5:ATH0\r]
Apr 28 17:37:47.57: [11669]: --> [10:NO CARRIER]
Apr 28 17:37:47.57: [11669]: MODEM No carrier
Apr 28 17:37:47.57: [11669]: MODEM set DTR OFF
Apr 28 17:37:47.57: [11669]: MODEM set baud rate: 0 baud (flow control unchanged)
Apr 28 17:37:47.57: [11669]: STATE CHANGE: SENDING -> MODEMWAIT (timeout 5)
Apr 28 17:37:47.57: [11669]: SESSION END

==> c000000296 <==
Apr 28 17:37:56.79: [11786]: <-- [16:ATDT09358283499\r]
Apr 28 17:38:27.79: [11786]: --> [2:]
Apr 28 17:38:27.79: [11786]: SEND FAILED: JOB 52 DEST 09358283499 ERR Unknown problem
Apr 28 17:38:27.79: [11786]: <-- [5:ATH0\r]
Apr 28 17:38:27.79: [11786]: --> [10:NO CARRIER]
Apr 28 17:38:27.79: [11786]: MODEM No carrier
Apr 28 17:38:27.79: [11786]: MODEM set DTR OFF
Apr 28 17:38:27.79: [11786]: MODEM set baud rate: 0 baud (flow control unchanged)
Apr 28 17:38:27.79: [11786]: STATE CHANGE: SENDING -> MODEMWAIT (timeout 5)
Apr 28 17:38:27.79: [11786]: SESSION END

==> c000000297 <==

==> c000000298 <==
Apr 28 17:50:11.78: [12614]: --> [2:]
Apr 28 17:50:11.78: [12614]: SEND FAILED: JOB 51 DEST 02142693473 ERR Unknown problem
Apr 28 17:50:11.78: [12614]: <-- [5:ATH0\r]
Apr 28 17:50:11.78: [12614]: --> [10:NO CARRIER]
Apr 28 17:50:11.78: [12614]: MODEM No carrier
Apr 28 17:50:11.78: [12614]: MODEM set DTR OFF
Apr 28 17:50:11.78: [12614]: MODEM set baud rate: 0 baud (flow control unchanged)
Apr 28 17:50:11.78: [12614]: STATE CHANGE: SENDING -> MODEMWAIT (timeout 5)
Apr 28 17:50:11.78: [12614]: SESSION END