Route did number to extension

i have doubt about my configuration.

beacause i have to route every incomming call on fxo nr 2 (fax number) to extension 3002, i created a did number.
then in inbound route, using my did number i routed every incomming call to desired extension.
and it is working good.
but when i call on fxo nr 1, after 4 rings i hear that fax answers.

where can i check what’s going on?

which config files are important to check this?

and on incomming call default destinations is a group that doesnt contain fax extension, so it cannot be that it rings fax and after 4 rings it answers.

and if i call fxo nr 3 everything is working good.

any suggestions?