If you are looking to check T-1/PRI circuits, go to LD 60 and enter STAT at the prompt, this will print out everything programmed showing what is active and what is not. This will not show analog lines into your system. If you need to see analog status, you need to know what cards are supporting the lines, then you can go to LD 20 and stat them. The format depends on what type of PBX you are using.
These are just quick snapshots of what is going on with minimal detail, but may be what you are looking for.