Gartner Research

How to Choose the Best SIP Trunk Architecture

Published: 07 March 2017

ID: G00325261

Analyst(s): Katja Ruud , Rafael Benitez


As enterprises migrate from TDM to SIP trunks for PSTN access, I&O leaders must decide where to terminate SIP trunks to control cost and management complexity, and increase agility and resiliency. We offer actionable insights to determine optimal architecture for specific circumstances/objectives.

Table Of Contents
  • Key Challenges


  • Why Is Understanding SIP Trunk Architecture Options Important?
  • Types of SIP Trunk Architectures
  • Advantages and Disadvantages of SIP Trunk Architectures


  • Move to a Centralized Architecture to Maximize Savings
    • WAN QoS and Bandwidth Requirements
    • Emergency Service (E911/999/112) Calling Considerations
    • Resiliency
    • Branch Office Survivability
  • Use a Distributed SIP Architecture if the WAN Is Subpar, or PBXs Are Not Consolidated
  • Leverage a Hybrid Architecture to Save on Global Deployments and to Provide Resiliency

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