AT&T SB67108 features DECT zero blind slot digital technology. Up to 10 accessory handsets active at the same time (number of active outside calls limited by number of outside phone lines). AT&T SB67108 stores up to 100 names and phone numbers for easy dialing. Numbers in separate memory locations can be linked to form a dialed number greater than 24 digits in length. Stores the last 10 numbers dialed at the handset for easy redialing. Redial numbers can be stored in memory or deleted. Stores name, number, time and date of up to 50 incoming calls, whether or not the phone is answered. Numbers stored in Caller ID history can be dialed directly.