Information Technology Reference
In-Depth Information
Chapter 1
Cisco Unified Communications Manager (CUCM) is an IP telephony call-processing solution. It provides distributed, scalable
enterprise call processing and IP telephony features for IP phones, Voice over IP (VoIP) gateways, and multimedia applications and
devices.
CUCM can be deployed using several different models, as shown in
Figure 1-1:
■
Single site:
In this model, CUCM provides call processing at a single site, with no telephony being implemented over an IP
WAN.
■
Multisite WAN with centralized call processing:
In this case, CUCM is deployed at a central site, and it provides call
processing for a number of sites, with VoIP/IP telephony traffic being carried over an IP WAN between sites.
■
Multisite WAN with distributed call processing:
When using this model, call-processing agents such as CUCM are
deployed at multiple sites, with VoIP/IP telephony traffic being transported over an IP WAN between sites.
■
Clustering over the IP WAN:
This involves deploying a single CUCM cluster with constituent CUCM servers spread across
several sites connected by the WAN.
Several best practices are associated with these different types of deployment models.
Best practices for the single-site model include the following:
■
The single-site model is suited for enterprises where most calls are made to destinations within the same site or to the public
switched telephone network (PSTN).
■
Deploy a highly available network infrastructure, with inline power, QoS, and security for phones.
