When you attempt to make a call, the EXS 9660 informs you if a line is currently In Use.
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2-LINE OPERATION
The handset and the base can be used on separate telephone lines at the same time. For example, if the handset is on a call with line 1, you can make, or receive calls, at the base on line 2.
The line 1 LED on the base blinks green to indicate line 1 is In Use at the handset.
When line 1 is In Use at the base
the LCD screen displays the following: (Base)
Line 1
▼Extension In Use
The Extension In Use feature prevents you from accidentally interrupting a call.
If you attempt to make a call and another phone is In Use on
line 1, the handset LCD displays “In Use“. (The line 1 LED at the base blinks.) If you press line 1, you will hear a beep. This warns you the line is In Use. To make your call, you must use line 2.
If you want to join a conversation on an extension currently In Use, press line 1 or line 2 twice.
