Line busy indication

[lgaetz (Lorne Gaetz)]

I assume you want to monitor DAHDI lines when busy, if so perhaps this will help:

How to determine the PSTN line status? is this SLA?

Hi, our assistant have cisco spa514g phone. with a module for BLF buttons we use freepbx with 4 PSTN lines. Basically, All i want to do is to get this lines status if they are busy or free. how to do that? I want to have 4 buttons 1 for each line, is such thing possible?