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USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network. [1] The service does not require a messaging app, and does not incur charges. [2] USSD messages are up to 182 alphanumeric characters long.
A callback, in this sense is a method of making low-cost international calls via a third country, usually the United States, where call charges are considerably lower.One variation of this technology was developed by IDT Corporation in 1991. [1]
A typical Web callback form. Web callback is a technology where a person can enter his or her telephone number in a form on a web site. The company who owns that Web site will then receive the Web callback request and a call center agent will call the person who made the request back on the number they entered.
That is, once a proxy receives a SIP request it will save some state information. Once the transaction is over, e.g., after receiving a response, the state information will soon after be deleted. A B2BUA will maintain state information for active calls and only delete this information once the call is terminated.
Telkom was incorporated on 30 September 1991 as a public limited liability company registered under the South African Companies Act, 61 of 1973, as amended. [15] In 1993 GSM was demonstrated for the first time in Africa at Telkom '93 in Cape Town. In 1994 the first GSM networks in Africa were launched in South Africa. [16]
In telecommunications, 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.
Japan: 1361 to get number, 1363 to call back. [4] United Kingdom: 1471 (also used in Gibraltar, Ireland, Isle of Man, Channel Islands, and the Falkland Islands) In the UK, after dialing 1471, the caller can press "3" to automatically return the call. Previously free, since August 2004 the return call service incurs a charge.
Telkom SA SOC Limited is a South African wireline and wireless telecommunications provider, operating in more than 38 countries across the African continent.Telkom is majority state-owned (55.3%) with the South African government owning 40.5% of Telkom, while another 14.8% is owned by another state-owned company - the Public Investment Corporation (PIC), which is closely linked to the South ...