Part of the GRP series of Carrier-Grade IP Phones, the GRP2604 is an essential 3-line model designed with zero-touch provisioning for mass deployment and easy management.Features 3 lines, 6 SIP accounts, up to 3 call appearances 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 a noise shield technology to minimize background noise Dual switched autosensing 10/100/1000 Mbps Gigabit Ethernet ports with integrated PoE (GRP2604P only) Supports 5-way audio conferencing for easy conference calls Enterprise-level protection, including secure boot, dual firmware images, and encrypted data storage Swappable faceplate to allow for easy logo customization Multilanguage. Temperature: 0º to 40ºC. Humidity: 10% to 90% non-condensing. Dimensions(L x W x H): 214 x 206 x 68 mm. Weight: 790 g.