Supports 2 lines, and 4 SIP accounts Supported by GDMS which provides a centralized interface to configure, provision, manage and monitor Grandstream devices Electronic Hook Switch (EHS) support for Plantronics, Jabra, and Sennheiser headsets Full-duplex speakerphone with HD audio to maximize audio quality and clarity Equipped with noise shield technology to minimize background noise Supports 5-way audio conferencing for easy conference calls