Specifications

Contents
iv
Cisco Unified SIP SRST 4.0 System Administrator Guide
Prerequisites for Configuring the SIP Registrar 23
Restrictions for Configuring the SIP Registrar 23
Information About Configuring the SIP Registrar 24
How to Configure the SIP Registrar 24
Configuring the SIP Registrar 24
Configuring Backup Registrar Service to SIP Phones 26
Configuring Backup Registrar Service to SIP Phones (Using Optional Commands) 30
Verifying SIP Registrar Configuration 33
Verifying Proxy Dial-Peer Configuration 34
Configuring Cisco Unified SIP SRST Features Using Redirect Mode (for Version 3.0 Only) 39
Contents 39
Prerequisites for Cisco Unified SIP SRST Features Using Redirect Mode 39
Restrictions for Cisco Unified SIP SRST Features Using Redirect Mode 40
Information About Cisco UnifiedSIP SRST Features Using Redirect Mode 40
How to Configure Cisco Unified SIP SRST Features Using Redirect Mode 40
Configuring Call Redirect Enhancements to Support Calls Between SIP IP Phones for Cisco Unified SIP
SRST
41
Configuring Sending 300 Multiple Choice Support 43
Configuration Examples for Cisco Unified SIP SRST Features Using Redirect Mode 45
Cisco Unified SIP SRST: Example 45
Where to Go Next 46
Configuring Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode (for Version
3.4 and Version 4.0 Only)
47
Contents 47
Prerequisites for Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode 47
Restrictions for Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode 48
Information About Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode 48
Cisco Unified SIP SRST and Cisco SIP CallManager Express Feature Crossover 48
How to Configure Cisco Unified SIP SRST 51
Configuring SIP Phone Features 51
Configuring SIP-to-SIP Call Forwarding 53
Configuring Call Blocking Based on Time of Day, Day of Week, or Date 55
SIP Call Hold and Resume 58
Configuration Examples for Cisco Unified SIP SRST Features Using Back-to-Back User Agent Mode 59