The AT&T 1739 Digital Answering System is a standalone device that offers 40 minutes of digital recording time, call screening, and outstanding sound quality. This well-designed answering machine also boasts integrated Message Guard backup memory to keep messages from being erased in the case of a power failure. The 1739 Digital Answering System offers a very convenient feature to help make it easier to get your messages remotely from any touch-tone phone using its built-in remote access option.