The Yealink SIP-T42S is a full-featured Gigabit IP phone that delivers superb sound quality and a rich visual experience. It features 6 lines, up to 12 SIP accounts, Gigabit Ethernet, HD voice, and flexible provisioning options. The SIP-T42S offers a faster, more responsive interface than the T42G and several performance enhancing functions. It is SIP compatible and can be used with a variety of IP PBX systems and hosted service providers.