stations and IP keysets receive a tone in the earpiece of the handset.The volume of the camp-on tone can beset by the station user. Camped-on calls follow Forward No Answer if a Forward No Answer destination hasbeen set.Optionally any station can be programmed to automatically camp-on to a busy station instead of having topress the camp-on button or dial a camp-on code.CALLER EMERGENCY SERVICE ID (CESID)This is a service where the telephone system sends a number, usually a call back number, to the Public ServiceAnswering point (PSAP) when a station user dials 911. This number is associated in the PSAP with a locationindicating exactly where the call originated. This allows the emergency services to respond directly to thecorrect building or floor of a building rather than to have to make inquiries as to the location of the emer-gency. This service is sometimes referred to as Enhanced 911 or E-911. This service is provided in two formsin the OfficeServ 500, either via a dedicated 4 port Centralized Automatic Message Accounting (CAMA) trunkcard called the E911 card or via an ISDN PRI circuit configured for both way DID connected to theTEPRI/TEPRIa card.CENTREX/PBX USECENTREX and PBX lines can be installed in lieu of central office trunks. CENTREX and PBX feature access codesincluding the command for hook-flash (FLASH) can be stored under one touch buttons. Toll restriction pro-gramming can ignore PBX or CENTREX access codes so that toll calls can be controlled when using theseservices.CHAIN DIALINGKeyset users may manually dial additional digits following a speed dial call or chain together as many speeddial numbers as are required.CHAIN FORWARDThe chain forward option determines whether a forwarded intercom call that subsequently forwards tovoicemail will target the original stations mailbox or the second stations mailbox.CLASS OF SERVICEThe system allows a maximum of 30 station classes of service. Each class of service can be customized inmemory to allow or deny access to features and to define a station’s dialing class. Each station can beassigned different classes of service for day and night operation.COMMON BELL CONTROLThe MISC daughter board provides relays that may be programmed to control a customer-provided commonbell or common audible device. These contacts must be programmed as members of a station group andmay provide steady or interrupted closure.COMPUTER TELEPHONY INTEGRATION (CTI)Computer Telephone Integration (CTI) allows integration between the OfficeServ 500 and a personal com-puter (PC) on a local area network (LAN). Caller ID service is required for TAPI inbound call applications thatuse the CID information to display computer records in conjunction with the presentation of the call to thestation on the OfficeServ 500.4.12