Hylafax No Carrier Detected

I can receive fax, but when I try to send one it goes on queue and after some times in the queue displays No carrier Detected. This is the log. Please, help me, I browsed, browsed the net without any aid!
Thanks to all
7688]: SESSION BEGIN 000000051 0xxxxxxxxx
dic 29 12:51:28.04: [ 7688]: HylaFAX ™ Version 6.0.6
dic 29 12:51:28.04: [ 7688]: SEND FAX: JOB 31 DEST 0xxxxxxxxxx COMMID 000000051 $
dic 29 12:51:28.04: [ 7688]: <-- [14:AT+FCLASS=1.0\r]
dic 29 12:51:28.04: [ 7688]: --> [2:OK]
dic 29 12:51:28.04: [ 7688]: DIAL 0xxxxxxxx
dic 29 12:51:28.04: [ 7688]: <-- [18:AT,X0DT0xxxxxxx\r]
dic 29 12:51:28.04: [ 7688]: --> [2:OK]
dic 29 12:51:28.05: [ 7688]: SEND FAILED: JOB 31 DEST 0xxxxxxxx ERR [2] No carrier detected
dic 29 12:51:29.05: [ 7688]: <-- [5:ATH0\r]
dic 29 12:51:29.05: [ 7688]: --> [2:OK]
dic 29 12:51:29.05: [ 7688]: SESSION END