
Chapter 7 Multisite WAN with Centralized Call Processing
Voice Messaging Considerations
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Cisco IP Telephony Network Design Guide
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Voice Messaging Considerations
Voice mail, like call processing, is usually not cost effective at the branch
locations. Centrally locating voice mail simplifies voice mail administration as
well as the provisioning of IP phones.
Whether interconnecting to a legacy system or an IP-based voice mail system, you
must plan adequate capacity for concurrent voice mail sessions and provision
associated transcoding resources if a low-bit-rate codec is required over the
wide-area network. See Figure 7-8.
Figure 7-8 Centralized Call Processing Voice Mail Cluster Placement
In Figure 7-8, there are five application servers at the hub location, and they can
provide voice mail for up to 2500 remote users. The DSP resources are required
to transcode from G.729 to G.711 in the event that a low bit rate codec is used
between locations and the application is G.711 only.
Centralized Call
Processing
Cluster X
Primary
Secondary
Cluster X
Location 1
Cluster X
Location 2
Conf
MTP
MTP
Conf
Application
server(s)
IP
IP
IP
IP
40818
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