# Enable Core Call Service Anomaly Detection

When the core call service runs into trouble, extensions can lose registration and calls can fail. To keep that disruption short, Cloud Voice can monitor the core call service on a schedule and, if you choose, launch a recovery routine the moment it spots a problem.

## Before you begin

Your Cloud Voice firmware must be version 84.15.0.22 or later.

## Turn on anomaly detection

1. Sign in to the PBX (Private Branch Exchange, the phone system) web portal and open **Maintenance > Troubleshooting > Advanced**.
2. Enable **Core Call Service Anomaly Detection**, then set the following:
   - **Detection Interval (s)**: How often the system checks the core call service. A shorter interval means more frequent health checks.

     :::note
     Enter a value of 10 or higher.
     :::
   - **Anomaly Confirmation Delay (s)**: How long the system waits after spotting a possible problem before it treats the problem as confirmed.

     :::note
     Enter a value of 30 or higher.
     :::
3. (Optional) To let the system fix a confirmed problem on its own, select **Automatic Recovery from Abnormality**.

   :::caution
   Recovery disconnects every call that is in progress at the time.
   :::
4. Click **Save**, then **Apply**.

## What happens next

Cloud Voice checks the core call service at the interval you set.

- When a problem is found, the system raises the **Abnormal Core Call Services** event and notifies the contacts assigned to it.
- When automatic recovery is enabled, the system starts the recovery routine as soon as a problem is confirmed. After the core call service comes back, the system raises the **Core Call Services Recovery Completed** event and notifies the assigned contacts.

  :::note
  If the core call service does not recover, [download the system logs](/pbx/administrator-guide/manage-system-logs/#manage-system-logs__section_ydd_vlr_ymb) and reach out to support for help.
  :::