Support of IP endpoints, stations, and/or trunks may not be the only trademark of a converged IP-PBX system design. A PBX system that supports neither IP stations nor trunks can be considered an IP-PBX if the system design includes geographically dispersed port cabinets/carriers using an IP LAN/WAN infrastructure for control signaling from the common control complex and voice communications between dispersed port interface equipment. Using a LAN/WAN infrastructure to support customer communications requirements across one or more customer premises locations based on a single IP-PBX system offers several potential key benefits:
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Single system image (numbering plan, features, systems management)
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Reduced networking costs between customer locations
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Scalable system expansion
There are several types of converged IP-PBX system designs in this category. They include upgrades of traditional circuit switched PBXs and IP-PBX systems whose original design was based on a LAN/WAN infrastructure to support desktop and networking communications requirements. The latter system designs were introduced by nontraditional PBX suppliers that entered the market during the late 1990s.
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