What is the DN set of the AR router

A DN set is also called a dial plan. A DN set contains a set of numbers that are processed together. Only numbers, call prefixes, trunks, and routes that belong to the same DN set are processed. That is, two users must belong to the same DN set before calling each other.
A DN set, a country code, and an area code identify the home area of a user; a DN set and a call prefix determine the dialing plan for a user.
A DN set divides a physical network or a device into multiple logical networks, similar to VLANs for a LAN.

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