Program a button to park a call on Grandstream GXP2000

I have to deploy a system with Grandstream GXP2000 phones. I have never used Grandstream phones before.

Is it possible to program a button to park a call on Grandstream GXP2000? I have tried to program a speed dial with ##70# but it is not working.

Nope I was never able to get it to work as everything I ever tried would never play back the parking slot number.