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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.
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.
Call forwarding, or call diversion, is a telephony feature of all telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available. Call forwarding was invented by Ernest J. Bonanno.
After entering a USSD code on a GSM handset, the reply from the GSM operator is displayed within a few seconds. While GSM is being phased out in the 2020s with 2G and 3G , a solution is available for supporting USSD services directly from the LTE / 5G / IMS network, providing a similar user experience as in GSM.
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.
Reply to or forward an email. Tap an email or conversation to open it. Tap on Forward or More option. Reply - Reply to the sender. Reply All - Reply to everyone on the email. Forward - Send a copy of the email to someone else. Compose your message and tap Send. Delete an email. To delete an email in the app, there are a few options:
It is used for call forwarding and voicemail services, voice and text messaging, as well as U.S. and international calls. Calls are forwarded to the phone number that each user must configure in the account web portal. Users can answer and receive calls on any of the phones configured [7] to ring in the web portal. While answering a call, the ...
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.