(1) To start a program or procedure, usually by specifying the entry conditions and transferring control to an entry point.
(2) A physical or logical connection between one or more parties in a telephone call.
(3) A single runtime instance of a voice application.
(4) An instruction in COBOL, assembler language, C/370, or PL/I format that is used by an application program to request DL/I services.
(5) In Sametime, an audible message sent using a traditional phone call (POTS, PSTN). It may be IP based, or a hybrid using both IP and traditional phone.
(6) An action state that invokes an operation on a classifier.