It would be easier to set up a remote coverage path for 1000 or whatever sets you need to have go "off-net". Then you done.. If you really want to be creative, have SAC set to "no" on the inital coverage path and setup coverage path number 2(next linkage) as all no's except SAC "yes". Then when the user leaves they hit SAC and the calls follows them to their cell numbers. When SAC is not activated if follows their normal coverage path.
When is the last time you helped someone, just because you were able to?
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