A fully functional phone system Fully integrates and automatically connects to X25 and X50 systems. Most commonly used features are pre-programmed on the phone for convenience. Features a 6-Line backlit display, which enables you to quickly see Caller ID, Call Logs and the Phone Book. Interactive soft keys surrounding the display change function based on the current operation of the phone. Features are readily accessible with no need for dedicated feature buttons. Includes 11 speed dial buttons. XBlue(R) X3030 VoIP Telephone For X25 And X50 Systems, Charcoal is one of many VoIP Systems available through Office Depot. Made by XBLUE.