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Cisco IP Telephony Solution Reference Network Design
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Chapter 1 IP Telephony Deployment Models
Single Site
Figure 1-1
Single-Site Model
Best Practices for the Single-Site Model
Follow these guidelines and best practices when implementing the single-site model:
·
Provide a highly available, fault-tolerant infrastructure based on a common infrastructure
philosophy. A sound infrastructure is essential for easier migration to IP telephony, integration with
applications such as video streaming and video conferencing, and expansion of your IP telephony
deployment across the WAN or to multiple Cisco CallManager clusters.
·
Know the calling patterns for your enterprise. Use the single-site model if most of the calls from
your enterprise are within the same site or to PSTN users outside your enterprise.
·
Use G.711 codecs for all endpoints. This practice eliminates the consumption of digital signal
processor (DSP) resources for transcoding, and those resources can be allocated to other functions
such as conferencing and Media Termination Points (MTPs).
IP
IP
M
M
M
M
M
IP WAN
Catalyst
backbone
Cisco
CallManager
cluster
Cisco Unity
LDAP
directory
Catalyst wiring closet
PSTN
74351
Msg store
Msg store
IP
IP