Specifications

47
Cisco Unified SIP SRST 4.0 System Administrator Guide
Configuring Cisco Unified SIP SRST Features
Using Back-to-Back User Agent Mode
(for Version 3.4 and Version 4.0 Only)
Note Prior to version 4.0, the name of this product was Cisco SIP SRST.
This chapter describes Cisco Unified Cisco Unified Survivable Remote Site Telephony (SRST) support
for standardized RFC 3261 features for SIP phones. Features include call blocking and call forwarding.
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
• Prerequisites for Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode, page 47
• Restrictions for Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode, page 48
• Information About Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode,
page 48
• How to Configure Cisco Unified SIP SRST, page 51
• Configuration Examples for Cisco Unified SIP SRST Features Using Back-to-Back User Agent
Mode, page 59
Prerequisites for Cisco Unified SIP SRST Features Using
Back-to-Back User Agent Mode
• Complete the prerequisites documented in the “Prerequisites for Configuring Cisco Unified SIP
SRST” section in the “Cisco Unified SIP SRST Feature Overview” chapter.