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SPECIAL REPORT

Calling all IP PBXes  
 
 
IP telephony solutions from 3Com, Avaya, Siemens, and Zultys differ in underlying protocol support, approach to management, and the number of users they can support. But all prove that VoIP is ready for the enterprise.

Sizing up VoIP servers  
3Com, Avaya, Siemens, and Zultys offer rich telephony features, excellent voice quality, and more or less scalability

Prepping for networked telephony  
Implementing an IP PBX means confronting a series of technical and management challenges 

How we tested  
A battery of rigorous hands-on tests revealed the strengths and shortcomings of our four IP PBXes


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