What is the call prefix of the AR router

A call prefix, an important attribute of the call service, defines a call number rule and describes the call number distribution and routing plans in an exchange office. A call prefix identifies the service attribute (basic service or supplementary service; intra-office call, national long-distance call, or international long-distance call) of a dialing plan and determines the range of dialed number length. Call prefixes can also be used to control call permissions. A PBX checks the validity of a dialed number and connects or rejects the call based on the call prefix. A call can be connected correctly only if the call matches the correct call prefix. Therefore, a correct call prefix configuration is the key to the call service. A call must match at least one call prefix.

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