1. IntroductionIntroduction1.1 Model composition ........................................31.2 Accessory information ...................................31.3 Additional/replacement accessories ..............41.4 General information .......................................51.5 Symbols, expressions, and styles .................61.6 Trademarks and registeredtrademarks ....................................................62. Important informationImportant information2.1 For your safety ..............................................72.2 Important safety instructions .........................82.3 For best performance ....................................82.4 Other important information ..........................82.5 For India only ................................................93. PreparationPreparation3.1 Controls .......................................................103.2 Using the display .........................................123.3 Charging the sub monitor ............................133.4 Setting the language, date and time ...........143.5 Wide/zoom settings and zoom positionsettings ........................................................144. Talking and monitoringTalking and monitoring4.1 Answering doorphone calls .........................164.2 Transferring doorphone calls ......................164.3 Monitoring the outside with thedoorphone ...................................................174.4 Talking with other devices ...........................175. Recording and playingRecording and playing5.1 Recording doorphone images .....................185.2 Playing recorded images (main monitor andextension monitor only) ...............................186. Using electric locks and PBXsUsing electric locks and PBXs6.1 Using electric locks .....................................206.2 Panasonic PBX integration .........................207. Incoming call operationsIncoming call operations7.1 When another incoming call isreceived .......................................................218. Additional functionsAdditional functions8.1 Zooming in and out (wide/zoom, pan/tilt; mainmonitor and extension monitor only) ...........228.2 Sound and display settings for calls andmonitoring ...................................................228.3 Ringtone settings ........................................238.4 Main monitor/extension monitor - functionsettings list ..................................................238.5 Sub monitor - function settings list ..............259. Expanding the systemExpanding the system9.1 Registering sub monitors and extensionmonitors ......................................................279.2 Using repeaters ...........................................279.3 Cancelling devices (main monitor/extensionmonitor) .......................................................2810. General informationGeneral information10.1 Cleaning ......................................................2910.2 Specifications ..............................................2911. TroubleshootingTroubleshooting11.1 Troubleshooting ..........................................3111.2 Error messages - main monitor ...................3411.3 Error messages - extension monitor ...........3411.4 Error messages - sub monitor .....................3412. VL-V900 basic operationsVL-V900 basic operations12.1 Controls .......................................................3512.2 Lobby station operations .............................3512.3 Main monitor operations with the lobbystation ..........................................................3612.4 System conditions and limitations ...............372Table of Contents