Abstract
Traditionally the private telephone exchange functions as a switch to connect a group of extension users in an organisation to the public switched telephone network (PSTN) and to connect these extension users to each other — and that's all. The installation of a new private automatic branch exchange (PABX) represents not only a major capital investment for a company, but the opportunity to benefit from recent great advances in telecoms. In theory the choice of exchange is straightforward: the stored program control (SPC) type PABX (or call connect system as it is sometimes known) will supersede both manual exchanges, with or without separate private automatic exchanges (PAXs), and Strowger electro‐mechanical exchanges. In practice the selection process is becoming increasingly complex.
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