1.13.4 Music on Hold ...............................................................................................................1521.14 Conference Features ....................................................................................................1541.14.1 Conference Features ....................................................................................................1541.14.1.1 Conference Features—SUMMARY ...........................................................................1541.14.1.2 Conference ................................................................................................................1551.14.1.3 Privacy Release .........................................................................................................1561.15 Paging Features ............................................................................................................1571.15.1 Paging ..........................................................................................................................1571.16 Broadcasting Features .................................................................................................1591.16.1 Broadcasting ................................................................................................................1591.17 Optional Device Features .............................................................................................1611.17.1 Doorphone Call ............................................................................................................1611.17.2 Door Open ....................................................................................................................1621.17.3 Trunk Answer From Any Station (TAFAS) ...................................................................1631.17.4 Background Music (BGM) ............................................................................................1641.17.5 Outgoing Message (OGM) ...........................................................................................1651.17.6 Direct Inward System Access (DISA) ...........................................................................1681.17.7 Automatic Fax Transfer ................................................................................................1761.17.8 Built-in Simplified Voice Message (SVM) .....................................................................1781.17.9 External Sensor ............................................................................................................1841.17.10 External Relay Control .................................................................................................1861.18 Caller ID Features ..........................................................................................................1871.18.1 Caller ID .......................................................................................................................1871.18.2 Incoming Call Log .........................................................................................................1911.19 Message Features .........................................................................................................1931.19.1 Message Waiting ..........................................................................................................1931.19.2 Absent Message ...........................................................................................................1961.20 Proprietary Telephone (PT) Features ..........................................................................1971.20.1 Fixed Buttons ...............................................................................................................1971.20.2 Flexible Buttons ............................................................................................................1991.20.3 LED Indication ..............................................................................................................2021.20.4 Display Information .......................................................................................................2051.21 Integrated Services Digital Network (ISDN) Service Features ..................................2071.21.1 Integrated Services Digital Network (ISDN) .................................................................2071.21.1.1 Integrated Services Digital Network (ISDN)—SUMMARY ........................................2071.21.1.2 Calling/Connected Line Identification Presentation (CLIP/COLP) .............................2111.21.1.3 Advice of Charge (AOC) ............................................................................................2131.21.1.4 Call Forwarding (CF)—by ISDN (P-MP) ....................................................................2141.21.1.5 Call Forwarding (CF)—by ISDN (P-P) .......................................................................2161.21.1.6 Call Hold (HOLD)—by ISDN ......................................................................................2181.21.1.7 Call Transfer (CT)—by ISDN .....................................................................................2191.21.1.8 Three-party Conference (3PTY)—by ISDN ...............................................................2201.21.1.9 Malicious Call Identification (MCID) ...........................................................................2211.21.1.10 Completion of Calls to Busy Subscriber (CCBS) .......................................................2221.21.1.11 ISDN Extension .........................................................................................................2231.21.1.12 ISDN Service Access by Keypad Protocol ................................................................2251.22 E1 Line Service Features ..............................................................................................2261.22.1 E1 Line Service ............................................................................................................2261.23 T1 Line Service Features ..............................................................................................2281.23.1 T1 Line Service ............................................................................................................2281.24 Voice Mail Features .......................................................................................................2301.24.1 Voice Mail (VM) Group .................................................................................................2301.24.2 Voice Mail DTMF Integration ........................................................................................2331.24.3 Voice Mail DPT (Digital) Integration .............................................................................2391.25 Portable Station (PS) Features ....................................................................................24410 Feature GuideTable of Contents