IP-PBX Mid-Size Maneuvering

Mier, Edwin E.; Mier, David C.; Tarpley, Robert B.; Pappas, Nickolaos A.
February 2005
Business Communications Review;Feb2005, Vol. 35 Issue 2, p24
Trade Publication
The article presents information on the mid-size IP-PBX range. In the Architecture part of the review, all aspects of the IP-PBX's architecture are examined--including scalability, survivability and voice-over- IP (VOIP) capabilities and configurability, ranging from vocoders and bandwidth control to teleworker and road warrior support. The testers set up and exercised each system's call-control redundancy and fallover, as well as the ability to re-route around a failed VOIP-PSTN gateway and a failed IP-WAN link. The abilities to set quality of service values for VOIP traffic and to tune VOIP performance parameters were also checked. Other architectural issues were reviewed in separate whiteboard and discussion sessions, including how multiple distributed systems are networked, which protocols and standards are supported, maximum capacity and expandability. The mid-size IP-PBX range, which we defined as systems handling from 100 to 1,000 IP stations, is a broad one. And just as broad in capacity and scalability were the systems that five vendors submitted for this review. Despite the mix, though, all proved they can deliver reliability and voice quality equal to predecessor TDM systems. Our testing finds these systems continue to improve in call quality and reliability, while adding features that predecessor TDM PBXs cannot support. INSET: Testing Mid-Size IP-PBXs.


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