Cisco Unified CallManager
Cisco's IP Communications product line, including IP telephony,
unified communication, audio/video conferencing, and customer contact
applications, helps organizations realize business gains by improving
operational efficiencies. These improved operational efficiencies result in
increased organizational productivity and enhanced customer satisfaction. Cisco
Unified CallManager, an integral component of the Cisco IP Communications
system, is the software-based call-processing component of the Cisco enterprise
IP telephony product line. It is enabled by Cisco Architecture for Voice, Video
and Integrated Data (AVVID). Figure B-2
offers a sample Cisco Unified CallManager topology.
Cisco Unified CallManager software extends enterprise telephony
features and capabilities to IP telephony network devices such as IP phones,
media processing devices, VoIP gateways, and multimedia applications. Additional
data, voice, and video services such as unified messaging, multimedia
conferencing, collaborative contact centers, and interactive multimedia response
systems interact with the IP telephony environment through Cisco Unified
CallManager open telephony application programming interfaces (APIs).
Cisco Unified
CallManager is installed on the Cisco Media Convergence Servers (MCSs) and
selected third-party servers. Cisco Unified CallManager software is shipped with
a suite of integrated voice applications and utilities, including the Cisco
Unified CallManager Attendant Console (a software-only manual attendant
console), a software-only ad-hoc conferencing application; the Bulk
Administration Tool (BAT); the CDR Analysis and Reporting (CAR) tool, the Admin
Serviceability Tool (AST), a simple Cisco Unified CallManager Auto Attendant
(CM-AA); the Tool for Auto-Registered Phones Support (TAPS), and the IP Manager
Assistant (IPMA) application.
Cisco Unified CallManager provides a scalable, distributable,
and highly available enterprise IP telephony call-processing solution. Multiple
Cisco Unified CallManager servers are clustered and managed as a single entity.
Clustering multiple call-processing servers on an IP network is a unique
capability in the industry and highlights the leading architecture provided by
Cisco AVVID. Cisco Unified CallManager clustering yields scalability from 1 to
30,000 IP phones per cluster, load balancing, and call-processing service
redundancy. By interlinking multiple clusters, system capacity can be increased
up to one million users in a system of 100 or more sites. Clustering aggregates
the power of multiple, distributed Cisco Unified CallManagers, enhancing the
scalability and accessibility of the servers to phones, gateways, and
applications. Also, triple call-processing server redundancy improves overall
system availability.
The benefit of this distributed architecture is improved system
availability, load balancing, and scalability. Connection admission control
(CAC) ensures that voice quality of service (QoS) is maintained across
constricted WAN links and automatically diverts calls to alternate public
switched telephone network (PSTN) routes when WAN bandwidth is not available. A
web-based interface to the configuration database enables remote configuration.
Additionally, HTML-based online help is available for users and
administrators.
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