The BT Response 75 Plus is a digital answering machine that records up to 36 minutes of messages. Features include an answer only mode, call intercept, call screening, memo messages, message capacity full alert, Pre-recorded outgoing message or record your own, remote access, selective delete, skip forwards/back, time and day stamp, VIP feature, speaker volume control.  This unit works well connected directly to your phone line or to a standard extension socket from you phone system.  More questions??? Down load the user guide below.