How do I determine which line can be used for a particular outbound call?
Problem:
I want to limit outgoing calls to specific lines.
Solution:
The dial plan determines which Line interface can be used for an external outbound call request from a client station based on the target public number.
For example, the default is (<:L1,2,3,4>9xx.) which means L1 through L4 will take a call starting with 9 and any digits thereafter.