Cisco Cisco IOS Software Release 12.2(2)XN

This document describes Cisco IOS support for the interworking of Cisco MGCP voice gateways and 
Cisco CallManager Version 3.1 in Cisco IOS Release 12.2(2)XN. This document also describes new 
command-line interface (CLI) commands that enable you to configure Cisco IP telephony devices for 
operation in a Voice over IP (VoIP) network.

This document contains the following sections:

12.1(3)T

This feature was introduced with Cisco CallManager Version 3.0 and the 
Cisco Voice Gateway 200 (Cisco VG200).

12.1(5)XM

H.323 support was added for E1 and T1 PRI, E&M, E1-CAS and BRI. 
Analog support with MGCP was added and analog DID was also added.

12.2(2)XA

Support was added for Cisco CallManager Version 3.0(8) and the 
Cisco 2600 and Cisco 3600 series routers but only for analog Foreign 
Exchange Stations (FXSs) and Foreign Exchange Offices (FXOs).

12.2(2)XN

Support for Media Gateway Control Protocol (MGCP) voice gateway 
interoperability was added to Cisco CallManager Version 3.1, Cisco 2600 
series routers, Cisco 3600 series routers, and the Cisco VG200. New 
MGCP features are also supported including T1 CAS, ISDN PRI 
Backhauling, Single-Point Configuration, Gateway Fallback, and 
Multicast Music-on-Hold (MOH).