Permissive dialing
Encyclopedia
In North America
, permissive dialing is the ability to make phone calls in an area subject to a newly introduced area code using both the new and preexisting dialing methods.
When an area is given a new area code under a split plan
, the area's previous area code would no longer be valid for calls in the area, so calls to numbers using the old area code will not work. To alleviate misdialing frustration, the local routing can be set up such that both the old and new area codes will work for the same telephone station. During this period, the local numbering authority must not reassign the area's existing exchanges
to the remaining area of the old area code, nor vice versa. At the end of the permissive dialing period, the old area code is no longer valid for numbers in the affected area.
Under an overlay plan
, permissive dialing refers to the ability to continue to connect calls via 7-digit dialing
while also making 10-digit dialing
valid. Again, the affected area must not introduce any new ambiguous telephone exchanges. At the end of the period, 10-digit dialing
becomes mandatory.
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...
, permissive dialing is the ability to make phone calls in an area subject to a newly introduced area code using both the new and preexisting dialing methods.
When an area is given a new area code under a split plan
Split plan
In telephony, a split plan is the practice of introducing a new area code by dividing an existing area code's territory and applying the new area code to one of the resulting divisions, replacing the existing area code within that section....
, the area's previous area code would no longer be valid for calls in the area, so calls to numbers using the old area code will not work. To alleviate misdialing frustration, the local routing can be set up such that both the old and new area codes will work for the same telephone station. During this period, the local numbering authority must not reassign the area's existing exchanges
Telephone exchange
In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls...
to the remaining area of the old area code, nor vice versa. At the end of the permissive dialing period, the old area code is no longer valid for numbers in the affected area.
Under an overlay plan
Overlay plan
In telephony, especially in North America, an overlay plan is the practice of introducing a new area code by applying it onto a geographic area that is already occupied by one or more existing area codes, resulting in two area codes serving the same area.- Methodology :Prior to the introduction of...
, permissive dialing refers to the ability to continue to connect calls via 7-digit dialing
7-digit dialing
7-digit dialing is a popular term referring to the traditional convention in the United States and Canada for dialing local phone calls. It is also sometimes known as local format or network format....
while also making 10-digit dialing
10-digit dialing
In the United States and Canada, 10-digit dialing is a popular term used to refer to the practice of including the area code of a phone number when dialing...
valid. Again, the affected area must not introduce any new ambiguous telephone exchanges. At the end of the period, 10-digit dialing
10-digit dialing
In the United States and Canada, 10-digit dialing is a popular term used to refer to the practice of including the area code of a phone number when dialing...
becomes mandatory.