Cisco Cisco IOS Software Release 12.4(4)T

© 2006 Cisco Systems, Inc. All rights reserved.

This document describes how to configure Cisco modem relay. This enhanced version of Cisco modem 
relay adds support for a nonnegotiated, bearer-switched mode for modem transport called 
gateway-controlled modem relay. The modem transport parameters are configured directly on the 
gateway by default, instead of being negotiated by the call agent.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image 
support. Access Cisco Feature Navigator at 

. You must have an account on 

Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at 
the login dialog box and follow the instructions that appear.

For more information about this and related Cisco IOS voice features, see the following:

; including library preface and glossary, other feature 

documents, and troubleshooting documentation.

12.4(4)T

This feature was introduced.

12.4(6)T

This feature was implemented on the Cisco 1700 series and Cisco 2800 
series.