Altigen ACM 6.7 Administrator's Manual page 194

Configuration Example - Solving 10-digit Dialing
4. Define a route called "10-digit Dialing" and add all T1 channels to the route. In the
"Digit Manipulation" section, check the first box, select Delete from Head, and
delete 1 digit:
5. Apply the "10-digit Dialing" route to dialing pattern 1214 and 1972:
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MAXCS ACM 6.7 Administration Manual