- The AT&T TL88002 Accessory Handset is an accessory handset only - Requires the AT&T TL88102 phone series in order to operate - Intercom between handsets - Conference between an outside line and up to 4 cordless handsets - 50 name and number phonebook directory - 10 number speed dial - Headset compatible (2.5mm jack) - Voicemail waiting indicator - Last 20 number redial - English/Spanish/French setup menu - Mute - Any key answer