- 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