Section 700 - Operation Chapter 3. System FeaturesDBS-2.3/9.2-700 DBS Manual - Revised April 2000 Page 3-25Hardware Requirements• SCC-B Version 1.2 or higher is required for this feature.Considerations• One of ten ringing patterns can be selected.• The ringing patterns are different for key phones and SLT/OPX phones.Door Box (Using Extension Adaptor)(CPC-B Version 7.0 and higher and CPC-A II Version 7.0 and higher)DescriptionDoor boxes (also called door phones) and door openers work together. Thedoor box is an intercom that allows visitors to announce their presence fromthe office door. The door opener enables a user to unlock the door using atelephone. Door openers are not sold by Panasonic; they can be purchasedseparately from an electronics dealer.There are two types of door phone adaptors available for the DBS. The firsttype (VB-43701) utilizes a trunk connection to connect to the door box. SeeDoor Box- (Using Trunk Adaptor) for more information. The second type(VB-43711) utilizes a digital port extension to connect to the door box anddoor opener and is described below.OperationTo Open a Door When Talking to the Door Box:1. Answer the Door Box.2. While still connected to the call, dial:#3 NNNN * (where NNNN is the Door Opener Access Code, if required -9999 by default)3. The door will unlock. Listen for the person to enter the building beforehanging up.To Open the Door When Not Talking to the Door Box:1. Press the ON/OFF key (or pick up the handset).