This applied some to the recent post of circuit IDs

I have to say I know nothing of the way this works and it confuses the heck out of me.

I am trying to sort out what is what at a new company I work for. There is no documentation and we are about to do a final switchover from AT&T to MCI.

The switchover has been voice and data, I have been tasked with verifying all circuits with letting my superiors know what AT&T circuits remain.

The documentation says there are LD PRIs.

Does LD PRI mean that it is Long Distance?
Does this have anything to do with the DMARC?

I have DHEC circuit ID's, I am told by the MCI person there should be 4 local circuits left.

But AT&T is telling me they only have Long Distance circuits, she could not identify and of the 69HCGS circuits on the DMARCs.

How the heck do all of these circuits tie into the phone system, how do I trace this and know what is what?

I know it is a tall order for you guys, but I have no where else to turn,

Can someone help with some info?