# Enable SIP User-agent Filtering

To enable SIP User-agent filtering to detect failed registrations:

1. On the MiVoice Border Gateway main page, click the Security tab and click SIP User-agent filtering.

2. In the page that opens, select the Enabled checkbox to enable SIP User-agent filtering

3. If the SIP User-agent filtering has already detected "Attempts" and "Failed registrations", the MBG Administrator can search for a specific User-agent by entering User-agent information in the Filter on User-agent string field. Only information for that User-agent will be shown.

4. Click the Auto reload checkbox.

5. In the Purge field, select either of the following options from the drop-down list:

   - 1 hour

   - 1 day

   - 1 week

   - 1 month

   - 1 year

Parent topic: SIP User-agent Filtering
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