A dial plan is a named set of normalisation rules that translate dialled phone numbers into an alternate format for purposes of call authorisation and call routing. All these rules are related to the destination number. It is divided into 3 parts a prefix, an append and a match pattern. Dial plans are designed to restrict access to specific prefixes that you do not want your users calling, or to automatically add a prefix to the digits dialled, as an example, adding the area code.
Restrict Dialing Destinations — https://au.voipcloud.online/support/article/360000206836-Restrict-Dialing-Destinations
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