CISCO-MEDIA-GATEWAY-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsCISCO-MEDIA-GATEWAY-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2009-02-25

Category: Cisco Devices, Telephony and VoIP

Description: Provides managed objects for managing trunk media gateways, including gateway entries, call control attributes, and IP configuration.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring CISCO-MEDIA-GATEWAY-MIB with a free 30-day trial of IPNetwork Monitor.

What Is CISCO-MEDIA-GATEWAY-MIB?

CISCO-MEDIA-GATEWAY-MIB is a Cisco Systems MIB module for managing Trunk Media Gateways, the Cisco media gateway network elements that convert audio between PSTN telephone circuits and Voice-over-IP/ATM packet networks, interfacing to Class 4/5 PSTN switches on one side and a VoIP/ATM network on the other. It exposes call-control and gateway-configuration data: per-gateway table entries with domain name and physical index, administrative and service (operational) state, IP-related configuration, and feature toggles such as source filtering, lawful-intercept enablement, and V.23 signaling support. Its monitoring emphasis is on software/operational status of the gateway function - checking cmgwServiceState against cmgwAdminState reveals whether a gateway is actually in service versus administratively down or transitioning, and cmgwGraceTime shows whether a graceful shutdown/reload is in progress, all key indicators of call-handling availability. It depends on Cisco's broader VoIP/media-gateway control architecture and typically works alongside signaling/call-control MIBs (e.g., MGCP- or H.248/Megaco-related MIBs) for complete call-path visibility. It is deployed on Cisco trunk media gateway platforms in service-provider and enterprise VoIP interconnection networks.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-MEDIA-GATEWAY-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

  • Cisco Trunk Media Gateway platforms (VoIP/PSTN interconnection)

Monitoring Examples

An operator would poll cMediaGwTable/cMediaGwEntry, keying on cmgwIndex, to compare cmgwAdminState against cmgwServiceState for each gateway and detect one that has failed to come into service after being administratively enabled. cmgwGraceTime would be checked to see if a gateway is mid-way through a graceful drain, while cmgwLawInterceptEnabled and cmgwV23Enabled reveal whether specific compliance or legacy-signaling features are turned on for that gateway's domain (cmgwDomainName).

What Can Be Monitored

  • gateway administrative vs. service state
  • graceful shutdown/reload timer
  • lawful intercept enablement
  • source filtering status
  • V.23 signaling support status
  • gateway domain/IP configuration
Imported Objects

From CISCO-SMI

ciscoMgmtOBJECT-IDENTITY

From CISCO-TC

CiscoPort
EntPhysicalIndexOrZero

From IF-MIB

InterfaceIndexOrZero

From INET-ADDRESS-MIB

InetAddress
InetAddressPrefixLength
InetAddressType
InetPortNumber

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION
TruthValue
OIDs

RFC description

Manages Cisco Media Gateways providing conversion between audio signals and data packets for VoIP/ATM networks.

Start monitoring Cisco Trunk Media Gateway platforms (VoIP/PSTN, legacy) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CISCO-MEDIA-GATEWAY-MIB