Parking calls on Cisco 50X

Hi all.

Trying to use two of my line buttons (line 5 and line 6) on my Cisco 508g to display parked calls. Scenario is that a call comes in, user presses Line 5 and the call get parked and all other users can see the call in slot Line 5. I can’t figure out how to implement this.

Any Cisco users out there?