Specifications

Cisco Unified SIP SRST Feature Roadmap

Documentation Organization

Cisco Unified SIP SRST 4.0 System Administrator Guide

Table 1 Cisco Unified SIP SRST Configuration Sequence

Chapter or Appendix Description

Cisco Unified SIP SRST Feature Overview Gives a brief description of Cisco Unified SIP SRST and provides

information on the supported platforms and Cisco Unified IP

phones. In addition, it describes any prerequisites or restrictions that

should be addressed before Cisco Unified SIP SRST is configured.

Getting Started Describes the two versions of Cisco Unified SIP SRST. This chapter

gives a brief overview of each version. In addition, Version 3.4

requires a few changes and new configurations as compared to the

setup that was required for Version 3.0. This chapter includes the

following tasks:

• Disabling Call Redirection

• Enabling SIP-to-SIP Connection Capabilities

Configuring the SIP Registrar Describes features available in Version 3.0 that are also necessary

for Version 3.4. Features include instructions on how to provide a

backup to an external SIP proxy server by providing basic registrar

services. These services are used by a SIP IP phone in the event of a

WAN connection outage when the SIP phone is unable to

communicate with its primary SIP proxy. This chapter includes the

following tasks:

• Configuring the SIP Registrar

• Configuring Backup Registrar Service to SIP Phones

• Configuring Backup Registrar Service to SIP Phones (Using

Optional Commands)

• Verifying SIP Registrar Configuration

• Verifying Proxy Dial-Peer Configuration

Configuring Cisco Unified SIP SRST Features Using

Redirect Mode (for Version 3.0 Only)

Describes features using redirect mode. This chapter includes the

following tasks:

• Configuring Call Redirect Enhancements to Support Calls

Between SIP IP Phones for Cisco Unified SIP SRST

• Configuring Sending 300 Multiple Choice Support

Configuring Cisco Unified SIP SRST Features Using

Back-to-Back User Agent Mode (for Version 3.4 and

Version 4.0 Only)

Describes features using back-to-back user agent mode. Features

include Cisco Unified SIP SRST support for standardized RFC 3261

SIP phones. This chapter includes the following tasks:

• Configuring SIP Phone Features

• Configuring SIP-to-SIP Call Forwarding

• Configuring Call Blocking Based on Time of Day, Day of Week,

or Date