Thanks, drgeoff. You are very helpful.
I have defined a digit map called "blk" as follows:
(140859xxxxx | 1630322xxxx)
So the following setting should drop all calls from all 11 digit phone numbers starting with 1408859 and 1630322, but allow everything else. Am I right?
X_InBoundCallRoute {(Mblk):},{ph}
Note that before I edited the X_InBoundCallRoute field, its value was just "ph" (without double quotes).
Regards,
Suyog