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Cisco IP Telephony Network Design Guide
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Chapter 1 Introduction
Multiple Sites with Independent Call Processing
The single-site model has the following design characteristics:
• Single Cisco CallManager or Cisco CallManager cluster.
• Maximum of 10,000 users per cluster.
• Maximum of eight servers in a Cisco CallManager cluster (four servers for
primary call processing, two for backup call processing, one database
publisher, and one TFTP server).
• Maximum of 2,500 users registered with a Cisco CallManager at any time.
• PSTN only for all external calls.
• Digital signal processor (DSP) resources for conferencing.
• Voice mail and unified messaging components.
• G.711 codec for all IP phone calls (80 kbps of IP bandwidth per call,
uncompressed).
• To guarantee voice quality, use Cisco LAN switches with a minimum of two
queues. See Chapter 2, “Campus Infrastructure Considerations,” for more
details.
Multiple Sites with Independent Call Processing
Figure 1-3 illustrates the model for multiple, isolated sites that are not connected
by an IP WAN. In this model, each site has its own Cisco CallManager or
Cisco CallManager cluster to handle call processing for that site.
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