This documentation isn't in the standard set of books:
In a nutshell, you create a CLID table that specifies "Send DN with NPA+NXX". Then you assign that CLID to all the DNs that are DID.
Here is a CLID table from the link I sent:
[tt]
REQ: CHG
TYPE: NET
TYPE NET_DATA
CUST 0
OPT
AC2
FNP
CLID YES < CLID Gate Opener
SIZE
INTL
ENTRY 0 < CLID Table to be modified/created
HNTN 972 < All Calls - NPA (Area Code)
ESA_HLCL 362 < Emergency Calls - NXX (Local Exchange)
ESA_INHN YES/NO < Emergency Calls - Include NPA on CLID
ESA_APDN YES/NO < Emergency Calls - Include DN on CLID
HLCL 362 < Normal Calls - NXX (Local Exchange)
DIDN YES/NO < Normal Calls - Include DN on CLID
HLOC 442 < UDP Calls - Home Location Code
LSC 2 < CDP Call - Local Steering Code (if used)
[/tt]
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