1 SIP account, up to 2 call appearances TLS and SRTP security encryption technology to protect calls and accounts 3-way audio conferencing for easy conference calls Electronic Hook Switch (EHS) support for Plantronics headsets Automated provisioning options include TR-069 and XML config files Full-duplex speakerphone with HD audio to maximize audio quality and clarity Use with Grandstream’s UCM series of IP PBXs for Zero Config provisioning Built-in PoE 802.3af to power the device and give it a network connection (GXP1610P/PGXP1615 ony)