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In European networks an “R” button is used in combination with touch tone digits to select various call handling functions. For example: Call Waiting: R1 — Answers incoming call & terminates current call. R2 — Answers current call & allows the user to toggle between calls. R3 — Establishes a 3-party conference.
In the C Standard Library, signal processing defines how a program handles various signals while it executes. A signal can report some exceptional behavior within the program (such as division by zero), or a signal can report some asynchronous event outside the program (such as someone striking an interactive attention key on a keyboard).
The sequence of operations performed by a switching system from the acceptance of an incoming call through the final disposition of the call. [1] See call control for a more complete description. The series of steps and processes by which an organization automates the handling of telephone calls (usually incoming calls).
Call features provide a customised experience for the caller and maximize the efficiency of inbound call handling. Call management parameters can specify how calls are distributed according to an operator's skill level in relation to a call, the time and/or date of a call, the location of the caller or through automatic routing processes. [3]
1997 – ISUP'97 (new procedures, IN CS1, new supplementary services) According to ITU-T Q.761 section 2.4.1 ISUP interworking ISUP'92 is backwards compatible with ISUP Blue Book and Q.767 [3] for basic call procedures and supplementary services except for some procedures (e.g. number portability). [4]
An automated call distribution system, commonly known as automatic call distributor or automatic call dispatcher (ACD), is a telephony device that answers and distributes incoming calls to a specific group of terminals or agents within an organization. ACDs direct calls based on parameters that may include the caller's telephone number, the ...
In other words, when the caller makes a procedure call, it can expect that those registers will hold the same value after the callee returns. Thus, making it the callee's responsibility to both save (push at the start) and restore (pop accordingly) them before returning to the caller.
For example, on 32-bit Windows, operating system calls have the stdcall calling convention, whereas many C programs that run there use the cdecl calling convention. To accommodate these differences in calling convention, compilers often permit keywords that specify the calling convention for a given function.