I think Bill is correct stating that "LD" means Long Distance. The term PRI is usually associated with ISDN service.

Many times, long distance service providers do not have the local facilities to deliver a T1 circuit. In those instances, they will lease a T1 from the local telephone company.

The local telephone company will install the T1 and, sometimes, label the jack with circuit IDs of BOTH providers. So it is entirely possible that there are some jacks with 69/HCGS/...... and DHEC...... IDs written on them.

It is also possible that you have T1 service from your local provider as well. One good way to tell would be to pull the telephone bills from the past few months and see what services each provider is charging you for.

Still, some of those jacks could be from circuits that have been disconnected for some time now.

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