Grandstream 2124 Park and Intercom keys

I’ve searched and searched, but to no avail.

Has anyone had any luck with programming a key on the Grandstream 2124 for Parking and one for intercom.

I need a key that will dial the *80 and then let you enter the extension number. An MPK programmed as *80xxx will work, but there are not enough keys to hold all the extensions.

The the MPK mode “Park” will park a call if it is initiated as an outbound call, but not if the call is inbound.