20 P R O D U C T C O M P A R I S O N S VTech ErisTerminal SIP Phones SIP Lines / Accounts HD Voice Codec Display Type Second screen programmable keys Proximity sensor for dynamic display of key labels Full Duplex Speakerphone Sensor Hookswitch EHS (electronic hook switch) Expansion Module Support (ET6) USB Built-in Bluetooth PoE Support Dual Ethernet Ports Type Total Programmable Keys Total Programmable functions Message Waiting Indicator Local Phonebook LDAP Phonebook Support XML Browser Corded Headset port Action URI/URL VPN Client Standard Warranty ET635 ET605 ET685 ET6 12 GigE 8 32 1000 RJ9 3 year 2 10/100 2 2 250 RJ9 3 year 12 GigE 6 24 1000 RJ9 3 year P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P 4.3" 160 x 384 LCD greyscale 4.3" - 480 x 272 color LCD 2.8" - 320 x 240 color LCD 2.3" - 132 x 64 LCD greyscale 3 per deskset 1st ET6 powered by deskset 18 18 3 year