Intel 05-2409-003 사용자 설명서

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This chapter describes the call state models provided by Global Call. Topics include the following: 

Global Call maintains a generic call model from which technology-specific call models can be 
derived. Some technologies support only a subset of the complete call model. The call 
establishment and termination procedures are based on this call model. The following sections 
describe the call states associated with the basic call model and configuration options.

Each call received or generated by Global Call is processed through a series of states, where each 
state represents the completion of certain tasks or the current status of the call. Some states in the 
basic call model are optional and can be enabled or disabled selectively. Only the optional states 
can be enabled or disabled. Every technology or call control library has a default call state model 
consisting of all the states it can possibly support from the basic call model. If a state is disabled, all 
corresponding events are disabled. If a state is enabled, all corresponding events are enabled. 

The call states change in accordance with the sequence of functions called by the application and 
the events that originate in the network and system hardware. The current state of a call can be 
changed by: 

Function call returns 

Termination events (indications of function completion) 

Unsolicited events 

The states of the basic call model are described in the following sections: