An essential characteristic of Centrex service is its ability to support multiple customers from one CO system, since the software package can be reliably partitioned. After "teething" problems with digital Centrex software were solved in the early 1980s, no case of incorrect connection between different customer services has been reported, which is really a remarkable record. A typical Centrex system based in a large CO can support up to 50,000 phones, so for most purposes the growth potential, for a specific customer, may be considered effectively unlimited.
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