
CHAPTER
7-1
Cisco IP Telephony Network Design Guide
78-11103-03
7
Multisite WAN with Centralized Call
Processing
This chapter provides design guidelines for multisite WAN systems that use
Cisco CallManager Release 3.0(5) for centralized call processing. The discussion
emphasizes issues specific to the centralized call processing model, with
reference to relevant material in other sections of this guide.
This chapter includes the following sections:
• Centralized Call Processing Model, page 7-1
• Call Admission Control, page 7-3
• Dial Plan Considerations, page 7-5
• Cisco CallManager Cluster Considerations, page 7-8
• DSP Resource Provisioning for Transcoding and Conferencing, page 7-10
• Voice Messaging Considerations, page 7-12
Centralized Call Processing Model
In a centralized call processing system (see Figure 7-1), Cisco CallManagers are
centrally located at the hub or aggregation site, with no local call processing at the
branch location.
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