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A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence.
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Despite the abandonment of telephone exchange names in telephone numbering plans, many telephone dials and keypads maintain a tradition of alphabetic dialing. Pushbuttons from digit 2 to 9 also displays letters, which is standardized in ISO 9995-8 and, in Europe, E.161. The alphabet is apportioned to the buttons as shown in the table.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
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Code 2 - Immediate risk of serious injury to a person or damage to property. Proceed lights and sirens. Permission granted to disobey road rules. Code 3 - Routine job. Proceed without lights or siren. Road rules must be obeyed. Code 4 - Negotiated response time. Proceed without lights or siren. Road rules must be obeyed.
The changes are an adjustment of Via’s current contract and also include limited busing services in Prosser and Benton City and a proposed shuttle service to the Tri-Cities Airport.
Dial plans in the public switched telephone network referred to as dialing procedures. [2] The collection of permissible digit patterns, so called digit-maps, for a private telephone system or for customer premise equipment, such as an analog telephone adapter (ATA) or an IP phone, is sometimes also called dial plan. A pattern may be as short ...