Hi Mark,
The Park Monitoring feature allows you to monitor the status of parked calls. This feature improves the user experience of retrieving the parked calls. When TAPI receives a parked call notification, a call representing the parked call is generated, and the call is set to CONNECTED INACTIVE state. The parked call is set to IDLE when it is retrieved or forwarded to Park Monitoring Forward No Retrieve Destination.
Reminder -indicates the park monitoring reversion timer for the parked call has expired.
Please refer Park Monitoring for more details.
Thanks and Regards,
Geevarghese