The ESI 24 Key digital phone features 12 programmable buttons in addition to a two line display. With features such as caller ID, speakerphone, call hold, call waiting, transfer, a help key, and a voicemail button, the 24 Key DFP is a powerful communication tool for any small / medium business or even as a deskphone in larger offices. The 24 Key DFP is a digital phone built for several ESI phone systems. The ESI 24 Key DFP makes an excellent phone for a desk user who needs access to several programmable keys, but does not need the large amount of keys offered by the larger ESI 48 Key DFP. The ESI 24 key DFP supports one touch button fixed keys for conferencing and transferring phone calls on the system.