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Kia - The VTECH CS5119-2 will display "LINE IN USE" when a different phone or extension phone (another handset from the same system) sharing the same line is in use. The phone will display this because the unit has sensed a change in the line voltage when a phone is turned on. If there is not another phone off hook when it displays this message, please contact our Consumer Sales and Service Center between the hours of 9:00 AM and 5:00 PM Monday through Friday at 1-800-595-9511. Thank you, -VTech Support
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