A business line package with a few popular features, which is available from carriers in some countries, clearly does not qualify as Centrex service when measured against the virtual PBX definition.
"Centrex versus PBX" issue is not new, the introduction of IP Telephony raises this question again, since all organizations should reconsider their Centrex or PBX deployment, with the prospect of migrating voice and video services onto their data networks. The case for outsourcing of telecom services is extensively developed, with attention to application, financial and management considerations. So what you need? Centrex or PBX?
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Virtual PBX Service
We generally consider Centrex as providing a "virtual PBX" service, with multiple customers and many sites being served by the software that resides in the one CO system, as shown in the upper part of Figure 1.2. A standard characteristic of Centrex is that all its stations have direct inward dialing (DID) access, usually based on seven-digit numbers. Users can employ abbreviated dialing (e.g., four digits) between Centrex-based stations within a local calling area. These features minimize the need for operator consoles within a Centrex system, although some type of operator support, for the occasional caller who needs assistance, is still usually required.

PBX replacement and KTS support.
A business line package with a few popular features, which is available from carriers in some countries, clearly does not qualify as Centrex service when measured against the virtual PBX definition.
A business line package with a few popular features, which is available from carriers in some countries, clearly does not qualify as Centrex service when measured against the virtual PBX definition.
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