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Cisco IP Telephony Network Design Guide
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Chapter 1 Introduction
Multisite IP WAN with Distributed Call Processing
The model for independent multiple sites has the following design characteristics:
• Cisco CallManager or Cisco CallManager cluster at each site to provide
scalable call control.
• Maximum of 10,000 IP phones per cluster.
• No limit to number of clusters.
• Use of PSTN for networking multiple sites and for all external calls.
• DSP resources for conferencing at each site.
• Voice message or unified messaging components at each site.
• Voice compression not required.
Multisite IP WAN with Distributed Call Processing
Figure 1-4 illustrates the model for multiple sites with distributed call processing.
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