The actions involved in a call processing can be categorized in two half calls. One half of the call handles the signaling involved in the originating end of the call. Other half call component handles the signaling involved in the terminating end of the call. This partitioning of a call in half call components simplifies the call design. Consider that a switch were to support N signaling systems. If half call design pattern is not used, it would have to deal with N x N call types to support all the signaling interworking call scenarios. With half call design pattern, each signaling type maps to originating and terminating half calls. Thus the number of call types to be supported is reduced to 2 x N.
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