The Cisco IP Phone 6800 Key Expansion Module for voice over IP (VoIP) Phones provides additional keys for directory numbers, speed dial, and programmable feature keys to the IP Phone 6851. Ideal for monitoring and managing the status of calls, this business phone expansion adds 14-line keys and 2-page keys for a total of 28 additional keys, with an easy-to-read grayscale LCD screen for quick identification.