Telecommunications switch having a universal applications program interface for stantardized interactive call processing communications

(57) Summary book invention is an application programming interface (API) between standardization host * switchboards for performing call control management, and this can carry out custom-made 化 that it should agree in telecommunication application and a network signal transmission demand. By Hazama of host application and a switchboard, general-purpose API consists of one or more normal messages which have the field in which a program is possible, in order to transmit a command, a state, and data. The present invention consists of a telecommunication switchboard in which a program is still more possible, and this provides a user with the capability to specify a "standard" or the desired API protocol which is essentially either of the specific specifications, in order to perform the function of arbitrary requests. It enables a user to include protocol development environment in the present invention, and to specify a separate limited state machine to it to each port given by the switchboard by this. Each -- although a limited state machine calls an atomic function a series of basic processing steps and this, it can specify independently, it ranks second and these basic forms are prescribed to a desired state machine by by combining them to a basic form in combination with a state and a phenomenon. The atomic function which makes include predetermined information under predetermined conditions, and is constituted that a predetermined message should be generated can be included in this state machine. The capability corresponding to a state event can also be further included in this state machine, and reception of the general API message constituted in order to give the information from host application to a state machine is included in the state event.