Specifications

Overview of Cisco IOS SRST

Support for Cisco IP Phones, Platforms, Cisco CallManager, Signals, Languages, and Switches

Cisco IOS Survivable Remote Site Telephony Version 3.4 System Administrator Guide

Cisco IP Phone Support

For the most up-to-date information about Cisco IP phone support, see the Cisco IOS Survivable Remote

Site Telephony (SRST) 3.4 Specifications for Cisco IOS Software Release 12.4(4)T at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/voice/srst/srst34/srs34spc.htm

The following IP phones are supported by Cisco SRST 3.4:

• Cisco Analog Telephone Adaptor (ATA) 186 and Cisco ATA 188 Version 2.16 and higher with Cisco

CallManager 3.3 and higher

Cisco SRST supports Cisco ATA 186 and Cisco ATA 188 using Skinny Client Control Protocol

(SCCP) for voice calls only

• Cisco IP Phone 7902G

• Cisco IP Phone 7905G

• Cisco IP Phone 7910

• Cisco IP Phone 7912G

• Cisco IP Phone Expansion Module 7914

• Cisco Wireless IP Phone 7920

• Cisco IP Conference Station 7935

• Cisco IP Conference Station 7936

• Cisco IP Phone 7940 and Cisco IP Phone 7940G

• Cisco IP Phone 7960 and Cisco IP Phone 7960G

• Cisco IP Phone 7970G

• Cisco IP Phone 7971G-GE

• Cisco VG224 Analog Phone Gateway, IOS Version 12.4(2)T with Cisco SRST 3.4 running

Cisco IOS Software Releases 12.3(14)T, 12.4 mainline, and later. For configuration information see,

the “Enabling Fallback to Cisco Unified SRST” section in SCCP Controlled Analog (FXS) Ports

with Supplementary Features in Cisco IOS Gateways at

http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a0080483a76.html.

• Cisco VG248 Analog Phone Gateway Version 1.2(1) and higher

Note During Cisco CallManager fallback, Cisco SRST considers the Cisco VG248 to be a group of Cisco IP

phones. Cisco SRST counts each of the 48 ports on the Cisco VG248 as a separate Cisco IP phone.

Support for Cisco VG248 Version 1.2(1) and higher is available as of Cisco SRST Version 2.1. For more

information, see the Cisco VG248 Analog Phone Gateway Data Sheet and the Cisco VG248 Analog

Phone Gateway Version 1.2(1) Release Notes.

Platform and Memory Support

For the most up-to-date information about the maximum number of Cisco IP phones, maximum DNs or

virtual voice ports, and memory requirements for Cisco SRST, see the Cisco IOS Survivable Remote Site

Telephony (SRST) 3.4 Specifications for Cisco IOS Software Release 12.4(4)T at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/voice/srst/srst34/srs34spc.htm