The vertical services code ( VSC ) is the sequence of digits and numbers (*) and a numbered sign (#) called on the phone keypad or play button to enable or disable the phone service feature certain. Some vertical service codes require dialing a phone number after the code sequence. On a touch tone phone, the code usually starts with a star button, generating a commonly used name star code . On a rotary call phone, the star is replaced by a 11 call.
In a North American phone, VSC is developed by AT & amp; T Corp. as Local Area Signaling Services ( CLASS or LASS ) in the 1960s and 70s. Their use became common throughout the 1990s and eventually became a recognized standard. Like CLASS are brands of AT & amp; T, the term vertical service code was adopted by the North American Numbering Administration Administration. The use of verticals is a somewhat dated reference to older transfer methods and the fact that these services are accessible only by local phone subscribers, up ( vertically ) within the local headquarters instead of going out ( horizontally ) to another phone company.
Video Vertical service code
Definition of features
North America
The following is the vertical service code generally recommended by the North American Numbering Administration Plan for use in the NANP area. Not all of these services are available in all areas, and some are only available for home or mobile phones.
Local Area Signaling Services (LASS) and Control Code Special Call Features:
Maps Vertical service code
See also
- Mobile calling code
- Pat Fleet - A quick sound for most AT & amp; T implementation of the VSC feature
- The telephone network is publicly redirected
- Short code
- Signaling System 7
References
This article incorporates public domain material from the General Services Administration "Federal Standard 1037C" document.
Source of the article : Wikipedia
0 Comments