Single PSTN for inbound/outbound


I moved from Asterisk 1.4 to FreePBX 2.8.x, seems great product.

I have few questions:

-How can I configure single PSTN line for both inbound,outbound calls? I saw DAHDI configuration need to put context. I tested from-internal for outbound calls working fine, from-zaptel for inbound all calls working fine.

But how to use single line as both way calls?

-I tested Trunks in Zap (dahdi compatibility mode) and Dahdi mode. Sometimes call hang on it. Only way to restart asterisk to get disconnect it. Any suggestion to check or configure trunk?

I saw there some trunk monitoring, how, which way to use it?