1.13.4 Music on Hold ...............................................................................................................1721.14 Conference Features ....................................................................................................1741.14.1 Conference Features ....................................................................................................1741.14.1.1 Conference Features—SUMMARY ...........................................................................1741.14.1.2 Conference ................................................................................................................1751.14.1.3 Privacy Release .........................................................................................................1771.15 Paging Features ............................................................................................................1781.15.1 Paging ..........................................................................................................................1781.16 Broadcasting Features .................................................................................................1801.16.1 Broadcasting ................................................................................................................1801.17 Optional Device Features .............................................................................................1821.17.1 Doorphone Call ............................................................................................................1821.17.2 Door Open ....................................................................................................................1841.17.3 Trunk Answer From Any Station (TAFAS) ...................................................................1851.17.4 Background Music (BGM) ............................................................................................1861.17.5 Outgoing Message (OGM) ...........................................................................................1871.17.6 Direct Inward System Access (DISA) ...........................................................................1901.17.7 Automatic Fax Transfer ................................................................................................1991.17.8 Built-in Simplified Voice Message (SVM) .....................................................................2011.17.9 External Sensor ............................................................................................................2071.17.10 External Relay Control .................................................................................................2091.18 Caller ID Features ..........................................................................................................2101.18.1 Caller ID .......................................................................................................................2101.18.2 Incoming Call Log .........................................................................................................2151.19 Message Features .........................................................................................................2171.19.1 Message Waiting ..........................................................................................................2171.19.2 Absent Message ...........................................................................................................2201.20 Proprietary Telephone (PT) Features ..........................................................................2221.20.1 Fixed Buttons ...............................................................................................................2221.20.2 Flexible Buttons ............................................................................................................2241.20.3 LED Indication ..............................................................................................................2271.20.4 Display Information .......................................................................................................2301.21 Integrated Services Digital Network (ISDN) Service Features ..................................2321.21.1 Integrated Services Digital Network (ISDN) .................................................................2321.21.1.1 Integrated Services Digital Network (ISDN)—SUMMARY ........................................2321.21.1.2 Calling/Connected Line Identification Presentation (CLIP/COLP) .............................2371.21.1.3 Advice of Charge (AOC) ............................................................................................2401.21.1.4 Call Forwarding (CF)—by ISDN (P-MP) ....................................................................2411.21.1.5 Call Forwarding (CF)—by ISDN (P-P) .......................................................................2431.21.1.6 Call Hold (HOLD)—by ISDN ......................................................................................2451.21.1.7 Call Transfer (CT)—by ISDN .....................................................................................2461.21.1.8 Three-party Conference (3PTY)—by ISDN ...............................................................2471.21.1.9 Malicious Call Identification (MCID) ...........................................................................2481.21.1.10 Completion of Calls to Busy Subscriber (CCBS) .......................................................2491.21.1.11 ISDN Extension .........................................................................................................2501.21.1.12 ISDN Service Access by Keypad Protocol ................................................................2521.22 E1 Line Service Features ..............................................................................................2531.22.1 E1 Line Service ............................................................................................................2531.23 T1 Line Service Features ..............................................................................................2551.23.1 T1 Line Service ............................................................................................................2551.24 Voice Mail Features .......................................................................................................2571.24.1 Voice Mail (VM) Group .................................................................................................2571.24.2 Voice Mail DTMF Integration ........................................................................................2601.24.3 Voice Mail DPT (Digital) Integration .............................................................................2671.25 Portable Station (PS) Features ....................................................................................27210 Feature GuideTable of Contents