Cisco Cisco IOS Software Release 12.2(11)YT

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Cisco Survivable Remote Site (SRS) Telephony V2.1 introduces integration with a central-site Unity 
voice-mail system, additional languages, Cisco IP Phone Expansion Module 7914, and enhancements to 
the dialplan-pattern command. 

This document discusses new features only. For information on SRS Telephony installation and basic 
configuration, refer to

.

12.1(5)YD

Version 1.0

This feature was introduced on the Cisco 2600 series and 
Cisco 3600 series multiservice routers, and on Cisco IAD2420 
series integrated access devices.

12.1(5)YD1

—

Support was added for 144 Cisco IP phones on the Cisco 3660 
multiservice routers.

12.2(2)XT

Version  2.0

IP phone features were added. This feature was implemented on 
the Cisco 1750 and Cisco 1751 routers.

12.2(8)T

—

This feature was integrated into Cisco IOS Release 12.2(8)T 
and implemented on the Cisco 3725 and Cisco 3745 routers, 
and on Cisco MC3810-V3 concentrators.

12.2(8)T1

—

Support was added for the Cisco 2600-XM and Cisco 2691 
routers.

12.2(11)T

Version 2.01

Support was added for a greater number of connected 
Cisco IP phones. The number of virtual voice ports was 
increased on Cisco IP phones. This feature was implemented 
on the Cisco 1760 routers and support for the Cisco 1750 was 
removed.