Description: AT&T 9452 Two-Line 900 MHz. Digital Cordless Answering System with Caller ID/Call Waiting. 900 MHz transmission for improved performance. Two-Line Capability allows you to access two separate lines. Speakerphone Caller ID/Call Waiting capability on the handset. Advanced Digital Voice Privacy guards against conversations being overheard. 3-Party conferencing capability. Headset compatible for hands-free conversation