Datasheet

Data Sheet
© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 1 of 9
Cisco Unified Survivable Remote Site Telephony Version
4.2
Cisco
®
Unified Communications solutions unify voice, video, data, and mobile applications
on fixed and mobile networks, delivering a media-rich collaboration experience across
business, government agency, and institutional workspaces. These applications use the
network as the platform to enhance comparative advantage by accelerating decision time
and reducing transaction time. The security, resilience, and scalability of the network
enables users in any workspace to easily connect anywhere, anytime, and anyplace,
using any media, device, or operating system. Cisco Unified Communications is part of a
comprehensive solution that includes network infrastructure, security, wireless, and
management applications; lifecycle services; flexible deployment and outsourced
management options; and third-party applications.
As the enterprise extends its IP telephony deployments from central sites to remote offices, a
critical factor in achieving a successful deployment is the capability to support backup call control
at the remote branch office. Cisco Unified Survivable Remote Site Telephony (SRST) provides a
cost-effective solution for supporting redundant call control in the remote branch office.
Benefits of Centralized Call-Processing Architecture
Cisco Unified SRST is a critical component of a centralized call-processing architecture in which a
Cisco Unified Communications Manager cluster, located at a central site, provides telephony
services for all sites of an organization. The architecture provides numerous benefits to
enterprises, including centralized and simplified management. Table 1 lists the benefits of a
centralized call-processing architecture.
Table 1. Benefits of Centralized Call-Processing Architecture
Features Benefits
Delivery of full feature set to remote branch locations, next-generation call centers,
unified messaging services, embedded directory services, and mobility
Improved productivity
Centralized configuration and management Reduced operating expenses
Simplified maintenance and troubleshooting Reduced operating expenses
Converged voice and data network Reduced operating expenses
Reduced installation cost (shared Cisco Unified Communications Manager
resource)
Reduced initial expense
However, a centralized call-processing architecture must include a strategy for survivability of
telephony service at the branch office when access to the centralized call processing is interrupted
because of WAN outage or other factors. Call-processing redundancy in the branch office is
particularly critical in an emergency (which may be the actual cause of the WAN outage).
Components of Centralized Call-Processing Architecture
The Cisco Unified Communications solution uses Cisco Unified Communications Manager
(formerly Cisco Unified CallManager) in combination with Cisco Unified SRST, which is embedded