Cisco Unified SIP SRST 4.0: Feature Roadmap

This chapter contains a summary of Cisco Unified Session Initiation Protocol (SIP) Survivable Remote Site Telephony (SRST) features and the location of feature documentation.

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Documentation Organization

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

Cisco SIP SRST Version	Cisco IOS Release	Modifications
Version 4.0	12.4(4)XC	—
Version 3.4	12.4(4)T	Cisco SIP SRST 3.4 includes the following features: • Upgrading from Cisco SIP SRST 3.0 to Cisco Unified SIP SRST 4.0 • Configuring Cisco Unified SIP SRST Features Using Redirect Mode (formerly SIP SRST) • Configuring Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode
Version 3.2	12.3(11)T	The SIP SRST feature was updated to include additional prerequisite information, including phone and memory requirements.
Version 3.1	12.3(7)T	The SIP SRST feature was integrated into Cisco IOS Release 12.3(7)T.
Version 3.0	12.2(15)ZJ 12.3(4)T	The SIP SRST feature was introduced.

Table Of Contents

Cisco Unified SIP SRST Feature Roadmap

Contents

Documentation Organization

Feature Roadmap