So I deployed 5 phones at a small site. Ported their numbers, and while deploying, the customer was like...oh, you have to transfer? Why can't I just push a Line button?.... So I scrambled and came up with the following. Yealink T42G's. After Building in Smart PBX Went over to the Advanced Provisioner APP. Key 1 =Type: Line / Account: Account 1 Key 2 = Type: BLF / Value:*3101 / Label, Line 1 (Note *3 is park or retrieve, 101 is the first park slot, 102 is the second and so on) Key 3 = Type: BLF / Value:*3102 / Label, Line 2 Key 4 = Type: BLF / Value:*3103 / Label, Line 3 Key 5 = Type: BLF / Value:*3104 / Label, Line 4 So. Usage. A Call Comes in and gets answered by anyone in the ring group. If it is for someone else. They press "Tran" and Line 1. The call gets parked. And the button lights red. To retrieve. Any of the users press the Line 1 button. And the call gets 'retrieved'. This is as close to a 'key system' as you can get (I think :) ). The irony in the whole thing, is that they do have to transfer...but they can just push 1 button to pickup the call.