CALL WAITING/CAMP-ONBusy stations are notified that a call is waiting (camped-on) when they receive a tone.The tone is repeated ata programmable interval. Digital keysets receive an off-hook ring signal through the speaker while single linestations 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 service is provided in the OfficeServ 7400 via an ISDN PRI circuit configured for both way DID connect-ed to the TEPRI card.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.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 MIS 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 7400 and a personal com-puter (PC) on a local area network (LAN). Caller ID service is required for TAPI inbound call applications that4.12