callback


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callback

(programming)
A scheme used in event-driven programs where the program registers a subroutine (a "callback handler") to handle a certain event. The program does not call the handler directly but when the event occurs, the run-time system calls the handler, usually passing it arguments to describe the event.

callback

(communications, security)
A user authentication scheme used by some computers running dial-up services. The user dials in to the computer and gives his user name and password. The computer then hangs up the connection and uses an auto-dial modem to call back to the user's registered telephone number. Thus, if an unauthorised person discovers a user's password, the callback will go, not to him, but to the owner of that login who will then know that his account is under attack.

However, some PABXs can be fooled into thinking that the caller has hung up by sending them a dial tone. When the computer tries to call out on the same line it is not actually dialing through to the authorised user but is still connected to the original caller.

callback

(communications)

callback

An authentication technique that calls the sender back. After connection is made, the receiving side breaks the connection and calls the sender to ensure that the logon was made from the authorized computer. Callback prevents a stolen ID and password from being used on a different machine. See also Web callback.
References in periodicals archive ?
Roamers CallBack solution allows subscribers, who are traveling outside the coverage area of their mobile operator, to place calls to their home network at cheaper rates avoiding costly roaming and interconnection charges.
Callback can also help organizations avoid the vicious cycle between less than ideal service levels and talk time--as service levels drop, average handle times climb.
Marshall Taplits, the Founder of Spaxtel said, "Over the years Jajah provided its customers a remarkable service and has gained a great reputation in the international callback market.
average number of callbacks per company by country, the Asian nations of China, South Korea,
The Cancer Callback scheme is free and patients can sign up to it by calling Tenovus on 0808 808 1010.
Data callbacks - apply to all parameters; information includes: initialization callbacks, finish callbacks, callback order for batch execution
Omni-channel callback solutions can be used to provide data access and aggregation from disparate sources, creating a more informed agent, and a happier customer.
We recognize that our customers' time is valuable and this callback service is one more way we can demonstrate just how much we appreciate them," said Tony Lent, Broadstripe's Chief Commercial Officer.
The convenience of the SMS CallBack feature makes it easy to reach friends and family at home, when traveling abroad.
Not all callback solutions are the same, however, nor are all companies that provide such capabilities.
Typically, when users retrieve their voice mail messages, the caller leaves a message and a number they can be reached at, also known as a callback number.
Then, after seeing me work on my developpe a la seconde for yet another Cats callback, Serena [Softer] suggested I audition for Footloose.