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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.
Call forwarding is disabled by dialing *73. This feature requires a subscription from the telephone company. Also available in some areas is Remote Access to call forwarding, which permit the control over call forwarding from telephones other than the subscriber's telephone. VOIP and cable telephone systems also allow call forwarding to be set ...
ETSI and 3rd Generation Partnership Project (3GPP) standards, such as GSM and LTE, define supplementary service codes that make it possible to query and set certain service parameters (e.g., call forwarding) directly from mobile devices.
To activate Remote Access to Call Forwarding, a subscriber calls a provider-supplied Remote Access Directory Number, enters the telephone number of the line to be redirected along with a personal identification number (PIN), a vertical service code (such as 72# or *73) and the number to which the calls are to be forwarded. Remote Access to Call ...
Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.
Call forwarding. Barring of Outgoing Calls. Barring of Incoming Calls. Advice of Charge (AoC). This GSM service estimates the call cost for display on the user's mobile phone. [1] This helps users by preventing bill shock [2] and reduces the load on the mobile network operator's customer service department. However, in practice, this GSM ...
Examples include "Call waiting", "Call forward on busy" etc. Call control software, because of its central place in the operation of the telephone network, is marked by both complexity and reliability. Call control systems will typically require many thousands of person years in development. They will contain millions of lines of high level code.
15 before the local number but after long distance area code for national calls (0 11 15 xxxx-xxxx) and 9 placed after the international access code excluding the 15 for international calls (+54 9 11 xxxx-xxxx). Armenia +374: 55: 8: Ucom: 95: 41: 44 77: VivaCell-MTS: 93: 94: 98: 91: Beeline Armenia