AT&T 974 4-Line Phone With Caller ID (89-0413-00, Refurbished)AT&T 974 4 Line Business Phone The AT&T 974 (Part #89 0413 00) is a powerful 4 line analog business phone designed for small office environments that need multi line capability without a full PBX system. Featuring caller ID, intercom functionality, and speakerphone, it delivers strong performance for growing businesses. The system is expandable up to 16 stations, allowing multiple phones to communicate internally and share linesmaking it ideal for