
CHAPTER
6-1
Cisco IP Telephony Network Design Guide
78-11103-03
6
Multisite WAN with Distributed Call
Processing
This chapter provides design guidelines for multisite WAN systems that use
Cisco CallManager for distributed call processing. The discussion emphasizes
issues specific to the distributed call processing model, with reference to relevant
material in other sections of this guide.
This chapter includes the following sections:
• Distributed Call Processing Model, page 6-1
• Call Admission Control, page 6-3
• Dial Plan Considerations, page 6-15
• Cisco CallManager Cluster Considerations, page 6-30
• DSP Resource Provisioning for Transcoding and Conferencing, page 6-30
• Voice Messaging Considerations, page 6-32
Distributed Call Processing Model
In a distributed call processing system (see Figure 6-1), each site contains its own
Cisco CallManagers, voice messaging, and digital signal processor (DSP)
resources.
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