Specifications

Cisco Unified SIP SRST 4.0 System Administrator Guide

Getting Started

Note Prior to version 4.0, the name of this product was Cisco SIP SRST.

This chapter describes the main tasks necessary for the following:

• Running Cisco Session Initiation Protocol (SIP) Survivable Remote Site Telephony (SRST) 3.0 for

the first time

• Running Cisco Unified SIP SRST 4.0 for the first time

• Upgrading from Cisco SIP SRST 3.0 to Cisco Unified SIP SRST 4.0

Note that upgrades from Cisco SIP SRST 3.4 to Cisco Unified SIP SRST 4.0 are not impacted by the

issues discussed in this chapter.

Note The Cisco IOS Voice Configuration Library includes a standard library preface, glossary, and feature and

troubleshooting documents and is located at

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vcl.htm.

Contents

• Comparison of Cisco SIP SRST 3.0 and Cisco Unified SIP SRST 4.0, page 15

• Configuration and Upgrade Tasks, page 16

• How to Upgrade from Cisco SIP SRST 3.0 to Cisco Unified SIP SRST 4.0, page 18

Comparison of Cisco SIP SRST 3.0 and

Cisco Unified SIP SRST 4.0

Cisco SIP SRST 3.0, Cisco IOS Release 12.2(15)ZJ Through Cisco IOS Release 12.4

Cisco SIP SRST 3.0 was a predecessor to Cisco Unified SIP SRST 4.0. In Cisco SIP SRST 3.0, you could

configure a Cisco IOS voice gateway to act as a SIP redirect server. The voice gateway would respond

to the originator of a call with a SIP Redirect message, and the Redirect message allowed the SIP phone

that originated the call to establish a call to its destination. In addition, several commands in voice