huntgroups & Calling-Station-ID

We have a problem with filtering users from a telco exchange that isn't
sending us CallerID's. We have on-line account opening, and all new
accounts have 5 hours access. Users with full CallerID's are easily
stopped from abusing the system and using extra accounts.

If the exchange isn't sending full Calling-Station-ID, but only 4 or 5
numbers we can filter the users by using hungroups:

goodone Calling-Station-ID = 12345, User-Name = gooduser
SQL-Group = dial
(this will let that user connect)

banthem Calling-Station-ID = 12345
SQL-Group = reject
(this will stop all others)

What can we do when NAS doesn't have any Calling-Station-ID to send?

Ivan

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