As all Grandstream IP phones do, the GXP1628 features state-of-the-art security encryption technology (SRTP and TLS). The GXP1628 supports a variety of automated provisioning options, including zero-configuration with Grandstream’s UCM series IP PBXs, encrypted XML files and TR-069, to make mass deployment extremely easy. Features 2 SIP accounts, 2 line keys, 3-way conferencing, 3 XML programmable context-sensitive soft keys HD audio on speakerphone and handset Dual-switched Gigabit ports, integrated PoE 8 dual-colored BLF/speed dial keys EHS support for Plantronics headsets Up to 1000 contacts, call history up to 200 records