Specifications

Getting Started
How to Upgrade from Cisco SIP SRST 3.0 to Cisco Unified SIP SRST 4.0
22
Cisco Unified SIP SRST 4.0 System Administrator Guide
What to Do Next
SIP registrar functionality in Cisco IOS software is a required part of Cisco Unified SIP SRST. By
default, Cisco Unified SIP SRST is not enabled and cannot accept SIP register messages. To configure
the SIP registrar to accept incoming SIP Register messages, see the “Configuring the SIP Registrar”
chapter.
To configure a basic voice register pool, see “Configuring Backup Registrar Service to SIP Phones”
section on page 26.
To configure call forwarding or call blocking, see the “Configuring Cisco Unified SIP SRST Features
Using Back-to-Back User Agent Mode (for Version 3.4 and Version 4.0 Only)” chapter.