3 rings, stop, other 3 rings etc

after my new installation i have a little problem:
When i receive 1 call, my phone make 3 rings, after stop and after begin for other rings.

What i can configure for not have this stop after 3 rings?
Thank you

Caller*ID, Fax detection, incorrect provisioning of a PSTN line . . .

You need to describe your system and setup very precisely.

i solved it
in queues the default agent timeout was 15 seconds.

Now i changed it in unlimited and i have not this problem
Thank you

Yep, that would explain it too.