Yealink SIP-T22P Professional IP Phone HD Voice 3 Line Keys (with POE, NO power supply) Call Hold, Call Waiting, Call Transfer, Call Forward 300 name/number phonebook, Caller ID, Call List, DND, Redial, Flash 3-way Conference, Speed Dial, Personal Ring Tone Voicemail, Volume Adjustment, Mute, Speakerphone LDAP