Cisco Cisco IOS Software Release 12.4(23)

© 2010 Cisco Systems, Inc. All rights reserved.

Providing timely and reliable voice services play a prominent role in growing IP telephony deployments. 
As the network and related services grow, the complexity of device integration—where existing devices 
must be updated and capable of learning and utilizing new telephony services—becomes a significant 
challenge for network administrators.

The Voice Services Advertisement Framework (Voice SAF) feature is a mechanism by which various 
Cisco Unified Communications devices can dynamically learn and adapt to changes in a network 
topology, allowing these devices to discover the existence, location, and configuration of networked 
resources within networks.

As networks grow, the services offered on these networks also grow. Voice SAF provides timely and 
reliable awareness of these additional services by leveraging the dynamic properties of routing protocols 
and providing a dynamic, plug-and-play environment for services within a network. In the most simple 
terms, Voice SAF enables applications to advertise and discover services.

This technical document is intended for people who are implementing Cisco Unified Communications 
IP telephony systems. It provides descriptions and scenarios for system administrators, network 
managers, and other users who are familiar with Cisco Unified Communications applications.

The Cisco IOS software documentation set is intended primarily for users who configure and maintain 
Cisco networking devices (such as routers and switches) but who may not be familiar with the tasks, the 
relationship between tasks, or the Cisco IOS software commands necessary to perform particular tasks. 
The Cisco IOS software documentation set is also intended for those users experienced with Cisco IOS 
software who need to know about new features, new configuration options, and new software 
characteristics in the current Cisco IOS software release.