Gartner Research

PBX vs. Centrex Comparison

Published: 14 October 2002

ID: G0092687

Analyst(s): Ray Horak, Rich Costello


While the basic differences between private branch exchange (PBX) and Centrex, whether conventional or IP-based in nature, are relatively clear, the subtleties can be quite confusing.

Table Of Contents
  • Making the Decision—Key Differences
    • Functionality—Current and Future
    • Cost
    • Responsibility/Control
    • Flexibility
    • Support
    • System Enhancement
    • Security
    • Points of Contact
    • Contingency Planning/Disaster Recovery
    • Relationship to the Network
    • Organizational Structure/Networking
  • Network Integration: Convergence at the Protocol Level
    • ATM
    • IP
  • Network Integration: Convergence at the Systems Level
    • IP PBXs
    • IP Centrex
  • State of the Technology
    • Major Vendors and Designations
  • Insight
    • Fit, Style, Legacy, Future

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