The Avaya J139 VoIP Business Phone 700513916 is a reliable and feature-rich communication device designed for business environments. Part of the Avaya J100 series, this phone offers high-quality wideband audio, speakerphone capabilities, and power-over-Ethernet functionality. With 4 lines, it provides efficient communication for a variety of office settings. The Ethernet (RJ-45) interface ensures connectivity and ease of use, making it an essential tool for modern businesses looking to streamline their telecom systems.