Protocols/Standards SIP RFC3261, TCP/IP/UDP, RTP/RTCP, RTCP-XR, HTTP/HTTPS, ARP, ICMP, DNS(A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP, LDAP, TR069, SNMP, 802.1x, TLS, SRTP*, IPv6 Network interfaces Two switched 10/100/1000 Mbps Ethernet ports with auto-detection, built-in PoE support (only in the GRP2604P model) Screen 132 x 64 (2.7 inch’) dots Backlit Graphic LCD Display Function buttons 3 line buttons with two-color LEDs and support for 6 SIP accounts, 4 XML programmable context-sensitive on-screen buttons, 5 buttons (navigation, menu). 10 BLF buttons, 8 special function buttons for: MESSAGE (with LED indicator), TRANSLATION, HEADSET, MUTE THE MICROPHONE, SEND/REDIAL, SPEAKERPHONE CONNECTION, VOLUME +, VOLUME Additional ports RJ9 headset jack (EHS support for Plantronics, Jabra and headsets Sennheiser) Voice codecs and features Support G.729A/B, G.711µ/a-law, G.726, G.722(wide-band), G.723,iLBC, OPUS, in- and out-of-band DTMF(in audio, RFC2833, SIP INFO), VAD, AEC, CNG, PLC, AGC, AJB Telephony functions Hold, Transfer, Forwarding, 5-way Conference, Call Parking , Call Interception, Shared Line (SCA)/parallel call indication (BLA), downloadable phonebook (XML, LDAP, up to 2000 entries), call waiting, call log (up to 800 entries), auto-dial when you pick up the handset, auto-answer, click-to-dial, flexible number plan, hot table system, personalized ringtones and music on hold, backup server and fault tolerance HD Audio Yes, HD quality in the handset and speaker with broadband audio support Footing Yes, 2 positions are available (39° & 45°), wall mounting option (*Wall mounting bracket sold separately) QoS Layer 2 QoS (802.1Q, 802.1P) and Layer 3 (ToS, DiffServ, MPLS) QoS Safety User and administrative level password, MD5 and MD5-sess authentication, configuration file with 256-bit AES encryption, SRTP*, TLS, 802.1x media access control, secure boot Supported languages English, Chinese, Korean, Japanese, German, Italian, French, Spanish, Portuguese, Russian, Croatian, etc. languages Update/Automatic configuration Firmware update via FTP/TFTP /HTTP / HTTPS, group configuration using GDMS (Grandstream Device Management System), TR-069 or XML configuration file with AES encryption Nutrition and energy efficiency Universal power supply Input 100-240V AC 50-60Hz; The output is +5V post. current, 600mA; PoE: IEEE802.3af Class 1, 3.84W; IEEE802.3az (EEE) (only for GRP2604P model) Temperature and humidity Operation: from 0°C to 40°C Storage: -10°C to 60°C Humidity: 10% to 90% non-condensing Package contents Phone model GRP2604, tube with wire, base, universal power supply (only for GRP2604 model), network cable, quick guide, labels for BLF Sizes Dimensions: 214mm (L) x 206mm (W) x 68mm (H) (with tube) Weight of the device:780g; Package weight:1100g for GRP2604P and 1150g for GRP2604 Compliance with standards GRP2604/GRP2604P FCC: Part 15 Class B; FCC Part 68 HAC; CE: EN 55032; EN 55035; EN 61000-3-2; EN 61000-3-3; EN 62368-1; RCM: AS/NZS CISPR32; AS/NZS 62368.1; AS/CA S004; IC: ICES-003; CS-03;