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A flexible, low cost and an expandable digital PAEX system is developed.--An innovatrV ' eideais adoptedto implement thedigital switching and tonegaraationbased on a digital signal pzocessor TMs32oC25. This mxasfdlyreduas thcavezheadsinassanbling a small scalePABX system.techniques. Special software structun is developed to handle multi-par@ calls. The technique used greatly simplifies the programming of multbparty calls. Object oriented design methodology is asplied throughout thedesign of the call proassing p r o w , which d t s in a Morunm, the system can be arpanded to baodle Inorclines with the use of parallel processing W b k yet easy-tO-maintain pr~gram -.

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