Release an Analog FXO Trunk

If an FXO trunk keeps in Busy status after a call is hung up, you can mandatory release the trunk to make the trunk available to use.

Background information

The issue that the trunk cannot be released automatically after a call is hung up is usually caused by incorrect Hangup Detection settings.


  1. Log in to PBX web portal, go to Extension and Trunk > Trunk, edit the problematic FXO trunk.
  2. Click Advanced tab.
  3. On the Advanced page, click Release Trunk.

    The trunk will be released, and the trunk status shows .

What to do next

Adjust the Hangup Detection settings for the problematic FXO trunk.
Note: The Hangup Detection settings require good knowledge of analog telephony, you may need to contact the trunk provider or Yeastar Support to configure the settings.