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Avaya CM cmgH248LinkDown Alarm

Jeremy Boilard

Problem Statement

A Minor alarm is reported on Avaya Communication Manager for maintenance object cmgH248LinkDown. The alarm description indicates that the H.248 link between a Media Gateway and its controller is down.

Impact

The affected Media Gateway may lose signaling/control connectivity to Avaya Communication Manager. Services homed to that gateway may be degraded or unavailable until the H.248 link is restored.

Alarm

cmgH248LinkDown

Troubleshooting Steps

  1. Identify the affected Media Gateway using the reported equipment number or gateway identifier in the alarm details.
  2. Confirm whether the alarm is still active in the monitoring dashboard or Avaya management interface.
  3. Check basic network reachability between Avaya Communication Manager and the affected Media Gateway. Verify that the gateway and controller interfaces are reachable and that routing/VLAN connectivity is intact.
  4. Inspect the physical and logical network path for the Media Gateway, including switch port status, cabling, uplinks, firewall rules, and any recent network changes that could block H.248 communication.
  5. Verify that the Media Gateway is powered on and operational. Check for local hardware, power, or module alarms on the gateway.
  6. Review Avaya Communication Manager and gateway status for the H.248 link. Confirm that the gateway is registered or attempting to register to the correct controller.
  7. If the gateway or controller was recently restarted, allow time for registration to complete, then recheck alarm status.
  8. If network connectivity is restored but the alarm remains active, restart or reset the affected Media Gateway only during an approved maintenance window or per the site support procedure.
  9. After remediation, confirm that the H.248 link is up and that the cmgH248LinkDown alarm has cleared from the dashboard.
  10. If the link remains down after network, power, and configuration checks, escalate to Avaya/voice engineering support with the alarm identifier, equipment number, timestamps, and results of reachability and gateway status checks.

Resolution

Restore connectivity and registration between the affected Media Gateway and its Avaya Communication Manager controller. Once the H.248 link is operational, verify that the cmgH248LinkDown alarm clears and that services associated with the gateway are functioning normally.