Cisco ASA 5506-X Configuration Manual page 204

MGCP Inspection
The media negotiated between these endpoints have an LCN of 258 with the foreign RTP IP address/port
pair of 172.30.254.203/49608 and an RTCP IP address/port of 172.30.254.203/49609 with a local RTP
IP address/port pair of 10.130.56.3/49608 and an RTCP port of 49609.
The second LCN of 259 has a foreign RTP IP address/port pair of 172.30.254.203/49606 and an RTCP
IP address/port pair of 172.30.254.203/49607 with a local RTP IP address/port pair of
10.130.56.3/49606 and RTCP port of 49607.
Monitoring H.323 RAS Sessions
The show h323 ras command displays connection information for H.323 RAS sessions established
across the ASA between a gatekeeper and its H.323 endpoint. Along with the debug h323 ras event and
show local-host commands, this command is used for troubleshooting H.323 RAS inspection engine
issues.
The following is sample output from the show h323 ras command:
hostname# show h323 ras
Total: 1
This output shows that there is one active registration between the gatekeeper 172.30.254.214 and its
client 10.130.56.14.
MGCP Inspection
The following sections describe MGCP application inspection.
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MGCP Inspection Overview
MGCP is a master/slave protocol used to control media gateways from external call control elements
called media gateway controllers or call agents. A media gateway is typically a network element that
provides conversion between the audio signals carried on telephone circuits and data packets carried over
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:
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Cisco ASA Series Firewall CLI Configuration Guide
8-12
GK
172.30.254.214 10.130.56.14
MGCP Inspection Overview, page 8-12
Configure MGCP Inspection, page 8-14
Configuring MGCP Timeout Values, page 8-16
Verifying and Monitoring MGCP Inspection, page 8-17
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.
Chapter 8
Caller
Inspection for Voice and Video Protocols