Jeff: There are long haul carrier ID's AT&T, MCI and so on. AT&T was DHEC (usually) for a T1, so I assume your DHZA is another long haul carrier. The HCGS is the LEC. You should know they couldn't use the same numbering system, you should have seen the mess we had before we were allowed to cross reference LEC ID's with ours. Of course you had different LEC ID's for each end, even if it was the same LEC.
PS to further confuse the issue the term LATA is used for calling area's but is not the same area as area codes..now figure that one out.
