A dialing rule establishes the permitted sequences of digits dialed on subscriber or station lines with subscriber premises equipment, such as telephones and private branch exchange (PBX) systems.
Dialing rule groups consist of dialing rule entries. Dialing rules are used to modify a phone number before sending it to an on-premises telephone system (PBX) or IP PBX for outgoing calls. Dialing rules serve two purposes:
To specify the types of outgoing calls you want to allow for a UM dial plan, you create a dialing rule group with dialing rules and then use them to authorize outgoing calls for Outlook Voice Access users and callers that dial into a UM auto attendant. You create separate dialing rule groups for in-country/region and for international calls.
Dialing plans in the public switch telephone network (PSTN) have traditionally been more commonly referred to as dialing procedures. The dialing plan of a private telephone system or a customer premise equipment, such as an analog telephone adapter(ATA), is sometimes also called dial plan. The digit sequences (numbers) permissible in a dialing plan may be as short as a single digit, e.g. for reaching an operator, or as long as a complete international telephone number, including trunk prefixes and international prefixes.
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