Cisco CP-7911G-CH1 Administration Guide - Page 23

Cisco Unified SCCP and SIP SRST Feature Overview MGCP Gateways and SRST MGCP Gateways and SRST MGCP fallback is a different feature than SRST and, when configured as an individual feature, can be used by a PSTN gateway. To use SRST as your fallback mode on an MGCP gateway, SRST and MGCP fallback must both be configured on the same gateway. MGCP and SRST have had the capability to be configured on the same gateway since Cisco IOS Release 12.2(11)T. To make outbound calls while in SRST mode on your MGCP gateway, two fallback commands must be configured on the MGCP gateway. These two commands allow SRST to assume control over the voice port and over call processing on the MGCP gateway. With Cisco IOS earlier than 12.3(14)T, the two commands are the ccm-manager fallback-mgcp and call application alternate commands. With Cisco IOS releases after 12.3(14)T, the ccm-manager fallback-mgcp and service commands must be configured. A complete configuration for these commands is shown in the section the "Enabling Cisco Unified SRST on an MGCP Gateway" section on page 64. Note The commands listed above are ineffective unless both commands are configured. For instance, your configuration will not work if you only configure the ccm-manager fallback-mgcp command. For more information on the fallback methods for MGCP gateways, see the Configuring MGCP Gateway Support for Cisco Unified Communications Manager document or the MGCP Gateway Fallback Transition to Default H.323 Session Application document. Support for Cisco Unified IP Phones and Platforms The following sections provide information about Cisco Feature Navigator and the histories of Cisco Unified IP Phone, platform, and Cisco Unified CM support from Cisco SRST Version 1.0 to the present version of Cisco Unified SRST. • Finding Cisco IOS Software Releases That Support Cisco Unified SRST, page 23 • Cisco Unified IP Phone Support, page 24 • Platform and Memory Support, page 24 • Cisco Unified Communications Manager Compatibility, page 24 • Signal Support, page 25 • Language Support, page 25 • Switch Support, page 25 Finding Cisco IOS Software Releases That Support Cisco Unified SRST Note With Cisco IOS Release 12.4(15)T, the number of SIP phones supported on each platform is now equivalent to the number of SCCP phones supported. For example, 3845 now supports 720 phones regardless of whether these are SIP or SCCP. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required. OL-13143-04 Cisco Unified SCCP and SIP SRST System Administrator Guide 23