RT31P2 and Asterisk?

I have a Linksys RT31P2-NA connected to the internet directly.

I am trying to configure the linksys to connect to my asterisk server at the office (Static IP) connected also directly to the internet.

But i always get a error.

Any advise what to check for?

Your question is like asking a mechanic “my car makes a funny noise what’s wrong with it?” There are a million things that could be wrong, anywhere from a broken engine to a squeaky seat spring. We need useful info to give you a useful answer.

what error do you get? is the error on CLI? what do you get from sip show peers? paste sip.conf segments? what does device status say?