Grandstream Carrier-Grade IP Phone 3 lines, 6 SIP accounts

3 lines, 6 SIP accounts, up to 3 call lines Compatible with 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 speaker with HD audio to maximize audio quality and clarity Equipped with noise protection technology to minimize background noise Auto-sensing, dual-switching 10/100/1000 Mbps Gigabit Ethernet ports with integrated PoE (GRP2603P only) Supports 5-way audio conferencing for easy conferencing Enterprise-grade protection including secure boot, dual firmware images, and encrypted data storage Interchangeable faceplate to allow for easy logo customization