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24-16
Cisco ASDM User Guide
OL-16647-01
Chapter 24 Configuring Application Layer Protocol Inspection
MGCP Inspection
the Internet or over other packet networks. Using NAT and PAT with MGCP lets you support a large
number of devices on an internal network with a limited set of external (global) addresses. Examples of
media gateways are:
• Trunking gateways, that interface between the telephone network and a Voice over IP network. Such
gateways typically manage a large number of digital circuits.
• Residential gateways, that provide a traditional analog (RJ11) interface to a Voice over IP network.
Examples of residential gateways include cable modem/cable set-top boxes, xDSL devices,
broad-band wireless devices.
• Business gateways, that provide a traditional digital PBX interface or an integrated soft PBX
interface to a Voice over IP network.
MGCP messages are transmitted over UDP. A response is sent back to the source address (IP address
and UDP port number) of the command, but the response may not arrive from the same address as the
command was sent to. This can happen when multiple call agents are being used in a failover
configuration and the call agent that received the command has passed control to a backup call agent,
which then sends the response. Figure 24-3 illustrates how NAT can be used with MGCP.
Figure 24-3 Using NAT with MGCP
MGCP endpoints are physical or virtual sources and destinations for data. Media gateways contain
endpoints on which the call agent can create, modify and delete connections to establish and control
media sessions with other multimedia endpoints. Also, the call agent can instruct the endpoints to detect
certain events and generate signals. The endpoints automatically communicate changes in service state
to the call agent.
MGCP transactions are composed of a command and a mandatory response. There are eight types of
commands:
• CreateConnection
• ModifyConnection
119936
Cisco
CallManager
Gateway is told
to send its media
to 209.165.200.231
(public address
of the IP Phone)
M
IP
M
M
Cisco
PGW 2200
H.323
To PSTN
209.165.201.10
209.165.201.11
209.165.201.1
IP IP
Branch offices
RTP to 209.165.201.1
from 209.165.200.231
RTP to 10.0.0.76
from 209.165.200.231
10.0.0.76
209.165.200.231
MGCP
SCCP
GW
GW
209.165.200.231