This method of parking calls is available only if specifically configured on your telephone system. To use it, you also need to add a Park and Page button on your phone. See Programmable Feature Buttons.
Park and page uses a set of park slot numbers, configured by your system administrator, that act like extension numbers.
When you parked a call in one of those park slots, you or any other user on the system can dial that park slot number to unpark the call.
Your system administrator can also configure up to 3 hunt groups for paging. When you park a call, after displaying the park slot number used, your phone displays options for paging.
Calls parked using Park & Page are not indicated in your phone's Status menu. However, calls that you park recall to your phone if left parked for too long.
If your phone has any Call Park buttons set to match the park slot numbers configured for Park & Page, those buttons indicate when a call is parked in that park slot and can be used to unpark it. However, when used to park a call, the phones does not display the page options.