ISDN BRI features Page 1751 of 1814International ISDN PRI Feature description and administration• Active feature dial tone;• Audible alarm.The Operator call back enhancement allows Call Wait or Camp-On to CallingParty Control and Called Party Control calls, and Attendant Break-in tooutgoing Calling Party Control calls and incoming Called Party Control calls.The Camp-on and Break-in capabilities are not supported on ISDN BRI,while the Call Wait capability is supported transparently for ISDN BRI.The Special operator call back ringing enhancement provides operatorcontrol of ringing cadences used in Toll Operator Call Back. This capabilityis supported transparently for ISDN BRI.The Malicious Call Trace enhancement allows a Meridian 1 to have CalledParty Control on incoming calls when the Malicious Call Trace (MCT)feature is activated from a station, or when the Multifrequency Compelled(MFC) Idle Call Trace (IDCT) signal is sent. This enhancement is notprovided on ISDN BRI.The tones and announcement feature allows a howler tone to be given toindicate that a 500/2500 terminal is off-hook. This capability is notapplicable to ISDN BRI terminals. This feature also provides new intercepttreatments upon the reception of some MFC signals. This capability issupported transparently for ISDN BRI.The active feature dial tone capability provides a distinctive dial tone to astation going off hook when it has the Do Not Disturb (DND) or MakeTerminal Busy (MSB) feature active. This capability is not provided onISDN BRI.The audible alarm feature provides an alarm to be sounded when anemergency number has been dialed, or when the system is alerted of anincoming malicious call. This capability is supported transparently for ISDNBRI.Part 4 - Ministry of Electricity and Industry (MOEI) featuresThis group of features is comprised of the following:• KE Multifrequency Compelled Signaling;• Flexible timers (dialtone, interdigit, and delayed answer);
