The Mitel Networks 5212 and 5224 IP Phones are full-feature, dual port, dual mode telephones that provide voice communication over an IP network. Each features a back-lit liquid crystal display (LCD) screen, display-assisted access to features, on-hook dialing and off-hook voice announce with handsfree answerback and a large ring/message indicator. The 5212 IP Phone offers 12 programmable keys, and the 5224 IP Phone offers 24 programmable keys for one-touch feature access. Both phones provide ten fixed feature keys for convenient access to features such as Conferencing, Redial, and many customizable user settings. The 5212 and 5224 IP Phones support the Mitel Call Control (MiNet) protocol and Session Initiated Protocol (SIP).