Vertical service code
Sequence of digits and the signals star (*) and number sign (#) dialed on a telephone keypad vertical service code or rotary dial to enable or disable certain telephone service features.
- Vertical service code54 related topics
Dual-tone multi-frequency signaling
Telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.
Telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.
This led to the addition of the number sign octothorpe asterisk or "star" (*) keys as well as a group of keys for menu selection: A, B, C and D. In the end, the lettered keys were dropped from most phones, and it was many years before the two symbol keys became widely used for vertical service codes such as *67 in the United States of America and Canada to suppress caller ID.
Telephone keypad
Keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number.
Keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number.
These keys were added to provide signals for anticipated data entry purposes in business applications, but found use in Custom Calling Services (CLASS) features installed in electronic switching systems.
Telephone number
Sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network or other public and private networks.
Sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network or other public and private networks.
Telephone numbers are often dialed in conjunction with other signaling code sequences, such as vertical service codes, to invoke special telephone service features.
Asterisk
Typographical symbol.
Typographical symbol.
) They are used to navigate menus in systems such as voice mail, or in vertical service codes.
Toll-free telephone number
Telephone number that is billed for all arriving calls instead of incurring charges to the originating telephone subscriber.
Telephone number that is billed for all arriving calls instead of incurring charges to the originating telephone subscriber.
There are a few special mobile-only numbers (like *CAA to call the Canadian Automobile Association) which are free from cell phones, these are actually vertical service codes.
Automatic callback
In telecommunication, an automatic callback is a computer telephony calling feature that permits a user, when encountering a busy condition or other condition where the called individual is unavailable, to instruct the system to retain the called number and to establish the call when there is an available line or when the called number is no longer busy.
Access control
Selective restriction of access to a place or other resource, while access management describes the process.
Selective restriction of access to a place or other resource, while access management describes the process.
1) A service feature or technique used to permit or deny use of the components of a communication system.
Called-party camp-on
In telecommunication, a called-party camp-on is a communication system service feature that enables the system to complete an access attempt in spite of issuance of a user blocking signal.
Essential service (telecommunications)
In telecommunication, an essential service (critical service) is a network-provided service feature in which a priority dial tone is furnished.
Automatic redial
In telecommunication, an automatic redial is a service feature that allows the user to dial, by depressing a single key or a few keys, the most recent telephone number dialed at that instrument.