Specifications

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Cisco CallManager 4.1
Chapter 4 Voice and IP Communications
Cisco CallManager 4.1
Cisco CallManager Version 4.1 provides a scalable, distributable, and highly available
enterprise IP telephony call-processing solution. The enhancements provided by Cisco
CallManager Version 4.1 offer improved security, interoperability, capability,
supportability, and productivity as well enhancements to video telephony introduced in
Cisco CallManager 4.0.
Multiple Cisco 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 CallManager
clustering yields scalability of 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 100+ site system. Clustering aggregates the power
of multiple, distributed Cisco CallManagers, enhancing the scalability and accessibility of
the servers to phones, gateways, and applications. Triple call-processing server redundancy
improves overall system availability.
The benefit of this distributed architecture is improved system availability, load balancing,
and scalability. Call Admission Control (CAC) helps ensure 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 interface to the configuration database enables remote device and system
configuration. HTML-based online help is available for users and administrators.
Cisco CallManager 4.1 has the ability to verify identity of the devices or servers that they
communicate with, ensure the integrity of data they are receiving, and provide privacy of
communications via encryption. The devices that can participate in secure communications
now includes the Cisco IP Phone 7940G, IP Phone 7960G, IP Phone 7970G, and Media
Gateway Control Protocol (MGCP) gateways. Secure administration and troubleshooting
is now capable with CallManager 4.1 using HTTPS.
Enhancements to the CallManager APIs (AXL, JTAPI, TSP) provide customers and 3rd
party vendors increased ability to develop improved applications that can be integrated with
CallManager and IP Phones.
Key Features
• Supplementary and enhanced services such as hold, transfer, forward, conference,
multiple line appearances, automatic route selection, speed dial, last-number redial,
and other features are extended to IP phones and gateways
• Capabilities enhancements are achieved though software upgradeability, avoiding
expensive hardware costs traditional to legacy PBX systems
Cisco Survivable Remote
Site (SRST) Bundles
2
Cisco 1760, 2600, 2800, 3700, and 3800 Voice Bundles for customers’ branch locations where
they need data connectivity plus local PSTN call handling with a centralized Cisco
CallManager deployment.
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Cisco V3PN Bundles
2
Cisco 1760, 2800 and 3800 Voice Bundles for remote branch locations needing VPN and IP
Telephony using Cisco CallManager Express or SRST with centralized Cisco CallManager
Express deployment.
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1. Cisco’s full line of multiservice routers also provide analog and digital voice gateway functionality through use of
network modules and voice interface cards. Please see the 1700, 2600XM, 3600, 7200, 5x00 series in
Chapter 1—Routers, as well as Chapter 7—Access Products.
2. Bundles provide a discount compare to ordering the parts individually. With each bundle, the customer needs to
choose the country explicit PSTN module required plus any additional features or modules for the applications.
Product Features Page