Carrier not detected signal

On one of our installations, we have installed two A800P cards with 6 fxo modules. After few days, people calling from outside start receiveing CARRIER NOT DETECTED signal. We reboot server and then everything works fine for few days then again.
In logs there is nothing suspicious.
Also, when I am connected with asterisk -r, theres nothing when I call that number. Just receive signal carrier not detected in earphone
Any help or sugestion?Thanks!

i] Last edited by stojko at 2009-9-17 19:00 [/i

Hello!
Please try to set the following parameters:

loadzone = Your Country
defaultzone = Your Country
Country = Your Country

If it still does not work, please give us more information. Thanks!

Ok. I will do that and let you know about progress.