Mitel Networks 5212 IP Phone VoIP Phone - SIP, MiNet (53678C) Category: IP Phones LCD Display phone supporting SIP and Minet software protocols. 12 programmable multi-function keys with dual-color LED indicators Elegant, modern & ergonomic design Fully featured, including conferencing, hold, transfer/forward, headset jack, addon modules, hearing aid compatible, PoE/AC power options, and many more features.