This document is a working example of the use of Media Gateway Control
Protocol (MGCP) between a Cisco IOS® Gateway (for example, VG200, 2600, 3600,
IAD2400) and a Cisco CallManager Media Convergence Server (MCS). It covers the
configuration of one foreign exchange office (FXO) connection to the public
switched telephone network (PSTN), as well as foreign exchange station (FXS)
connections to analog hand sets. This document also shows VoIP connectivity to
Cisco 7960 IP phones. When this configuration is complete, it will be possible
to make calls between all of the phones used in this configuration. It will
also be possible to route calls over the PSTN from any of the phones used in
This document assumes that the reader is already familiar with how to
configure Cisco IP phones in CallManager. This document also assumes that there
is at least one IP phone already active on the Cisco CallManager server.
You can potentially encounter these symptoms when you configure Cisco
CallManager with IOS MGCP gateways with analog FXO and FXS ports:
The MGCP gateway does not register with Cisco CallManager. Refer to
Gateway Registration Failure with Cisco CallManager.
Caller ID does not work on FXO ports. This is because caller ID is
not supported with FXO ports when configured for MGCP. Instead, configure the
gateway in H.323 mode.
Overhead paging locks up the FXO port when doing hookflash unless
users go completely off-hook. Perform a shut, no shut to reset the port. This
is related to Cisco bug ID
(registered customers only)
and is fixed in Cisco IOS Software
Release 12.3(14)T and later.
There are no specific requirements for this document.
This configuration was tested with Cisco CallManager versions 3.x and
4.x and various versions of Cisco IOS Software 12.2 images. The screen shots
found in the links within this document and the Cisco IOS configurations listed
were captured using the software, hardware and other equipment listed
Cisco VG200 / 2 X FXS / 2 X FXO / 1 FastEthernet 10/100
Various versions of Cisco IOS Software Release 12.2
Cisco CallManager (specific versions are listed in the individual
Cisco 7960 IP Phones
The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.
For recommended compatibility software versions between Cisco
CallManager and the IOS Gateway, refer to the
Unified Communications Manager Software Compatibility Matrix. If your
network has special needs, consult with your Cisco Account Manager before you
change any Cisco IOS Software.
Note: Cisco recommends Cisco IOS Software Release 12.2(11)T or later based
on the ccm-manager command enhancements. The
ccm-manager command requires Cisco IOS Software
Release 12.1(5)XM or later on all routers (2600, 3600) and the VG200.
Cisco 2600 and 3600 routers support MGCP if they run Cisco IOS Software
Release 12.1(3)T or later. The release and version that you require will be
based on the features that you need to enable. The router configuration is the
same for all types of routers. See the Document
Contents section for documentation on specific features and requirements
related to Cisco CallManager.
Note: NM-HD-2V on an MGCP gateway is supported only from Cisco CallManager
3.3(3)SR4a and later. The NM-HD-2V is not listed as an MGCP Gateway option in
Cisco CallManager versions earlier than 3.3(3)SR4a.
Technical Tips Conventions for more information on document
the Cisco IOS MGCP Gateway
the Cisco CallManager Server
and Troubleshooting the Cisco IOS MGCP Gateway
of Debug MGCP Packets
Reset, and Delete MGCP Gateways for Cisco CallManager
You can use this document as a guide to configure the devices for use
in a real network or as a workbook example to use in a lab environment for
learning or testing purposes. Sections 4 and 5 are provided for additional
information. If the tasks in sections 2 and 3 result in a working
configuration, it is not necessary to refer to sections 4, 5 or 6.
Note: It is not necessary to do sections 2 and 3 in the order presented.