Snom D745 Desk Telephone, Black (4259) Type: IP Phone Protocols: SIP (RFC3261) DHCP, NTP HTTP / HTTPS / TFTP LDAP (Directory) Dual Stack IPv4 / IPv6 Security: 802.1X authentication and EAPOL Transport layer security (TLS) SRTP (RFC3711), SIPS, RTCP HTTPS server / client password-protected web interface VPN-support VLAN (IEEE 802.1Q) LLDP-MED, RTCP-XR Dimensions: 7.28 x 8.66 x 7.28 Weight: 2.07 lbs. Temperature: Ambient temperature: 0 degree C to 35 degree C (32 degree F to 95 degree F) Storage temperatur: -10 degree C to 45 degree C (14 degree F to 113 degree F) Humidity: 5% to 95% (non-condensing) Specifications: Input voltage: 5V DC (SELV) Power supply: PoE or 5V DC power adapter(1) Handset: 4P4C connector Headset: 4P4C connector Hearing aid compatible (HAC) handset 1 x USB 2.0 host port, type A, Hi / Ful...