As all Grandstream IP phones do, the GXP1620/1625 features state-of-the-art security encryption technology (SRTP and TLS). The GXP1620/1625 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. Specifications: 2 SIP accounts, 2 line keys, 3-way conferencing, 3 XML programmable context-sensitive soft keys Dual-switched 10/100 mbps ports, integrated PoE on GXP1625 HD audio on speakerphone and handset EHS support for Plantronics headsets Up to 1000 contacts, call history up to 200 records