The Aastra 6731i, a new member of the carrier-grade, open-standards based 67xi SIP portfolio, offers exceptional features and flexibility in a enterprise grade IP telephone. With a sleek, elegant design and a compact footprint, this multi-line SIP telephone delivers the advanced features and performance traditionally found only in higher priced products. Featuring a 3 line LCD display, the 6731i supports up to 6 lines with call appearances, offers advanced XML capability to access custom applications and is fully interoperable with leading IP-PBX platforms. Supported by a host of Aastra configuration options, XML development tools and continuous product enhancements via software releases, the value offered by the 6731i makes it is ideally suited for daily telephone use for the small and large business market and enterprise applications. Sold without power supply (Aastra AC Adpt. 31i - 5xi - 6739i). It is used to provide power when in-line power over Ethernet is not available.