Cortelco Colleague 2-line corded telephone- Caller ID- Call waiting Caller ID: can take the call, send it to voice mail, In.please waitIn. or In.call backIn. features- 99# Caller ID history- Wide angle LCD super twist- 3-Line backlit LCD- Trilingual menu- Display icons new call, repeat call, forward call, toll call, mw- Voice message indication FSK/stutter/90V light- Speakerphone- Mute with LED- Electronic hold with extension release- 10#Direct memories- Programmable flash- Redial- Ring indicator- Ring off/low/high switch- Volume control- Data port- Tone/pulse switchable- Dual headset jacks provides 2.5mm jack and an RJ-11 jack- Conference