I've got a Nortel Door Phone and DOC. Got the Door phone installed and need to install the DOC to open a parking gate. The gate currently has a card swipe to permit exit, but they wanted a door phone and DOC installed so people can call if their card does not open the gate. The manufacturer of the gate says I need a dry contact that is N.O (normally open). The DOC instructions says I need a 12-24V power source. I can tap the 24 power source from the gate and connect it to terminals 1 & 2.
The next couple of steps is confusing because the instructions refer to door strikes. Do I still connect one side of the gate to power and the other to Terminal 4 even if its a dry contact? Also, do I need to set the DIP 1-4 to XXXX? or can it stay on default(6)?

Any help is appreciated.

Thanks