I'm part of the CIE-Group Technical Team in the UK and we've been making simple videos for engineers across the UK when installing Akuvox Intercoms and Indoor Monitors. Here's a sample of two of the videos on the X933 we've created which show you how to enable Intercom Preview and Disable Busy tone.
Intercom Preview is a feature which is used to display the Camera feed during an Incoming Call on to the Indoor Monitor, this is a useful feature to allow you to unlock the door without having to answer and/or see whos calling before deciding to answer the call.
Busy Tone is a tone which is auditable after the Indoor Monitor drops a call, this by default is enabled however if you have multiple Indoor Monitor within a small space it becomes overwhelming on each call being dropped from all Indoor Monitors.
