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Yealink presents a dynamic business communication solution to executives and professionals with the new SIP-T48U IP phone. The phone employs an appealing large touch screen that makes the switch between pages and applications swift, easy and convenient. United Yealink Optima HD Voice technology and wideband codec of Opus, the T48U awards you the superb audio quality and crystal-clear voice communications. Moreover, the T48U puts dual USB ports in a phone that makes Bluetooth, Wi-Fi, USB headset and USB recording come true, and you can use any two of them freely according to your needs. The Yealink new T4U series offers the same elegant appearance as the T4 line, but with improvements for greater interoperability and better collaboration. Learn More

Protocols/Standards SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP, ICMP, DNS(A record, SRV, NAPTR), DHCP, PPPoE, TELNET, TFTP, NTP, STUN, SIMPLE, LLDP, LDAP, TR-069, 802.1x, TLS, SRTP, IPV6 Network Interfaces Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports with integrated PoE Bluetooth Yes, integrated Wi-Fi Yes, integrated dual-band Wi-Fi 802.11 a/b/g/n/ac (2.4GHz & 5GHz) Graphic Display 4.3 inch (480x272) TFT color LCD Voice Codecs and Capabilities Support for G7.29A/B, G.711μ/a-law, G.726, G.722(wide-band), G723, iLBC, OPUS, in-band and out-of-band DTMF(in audio, RFC2833, SIP INFO), VAD, CNG, AEC, PLC, AJB, AGC Telephony Features Hold, transfer, forward, 3-way conference, call park, call pickup, shared-call-appearance(SCA)/bridged-line-appearance(BLA), downloadable phonebook(XML, LDAP, up to 2000 items), call waiting, call log(up to 2000 records), XML customization of screen, off-hook auto dial, auto answer, click-to-dial, flexible dial plan, hot-desking, personalized music ringtones and music on hold, server redundancy and fail-over HD Audio Yes, HD handset and speakerphone with support for wideband audio Extension Module Yes (GBX20) Feature Keys 10 line keys with up to 5 SIP accounts, 5 XML programmable context sensitive softkeys, 5 navigation/menu keys, 9 dedicated function keys for: MESSAGE(with LED indicator), TRANSFER, HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE, VOL+, VOL- Base Stand Yes, 2 angle positions available, Wall Mountable (*wall mount sold separately) QoS Layer 2 QoS (802.1Q, 802.1P) and Layer 3 QoS (ToS, DiffServ, MPLS) Auxiliary Ports RJ9 headset jack (allowing EHS with Plantronics headsets), USB Security User and administrator level passwords, MD5 and MD5-sess based authentication, 256-bit AES encrypted configuration file, SRTP, TLS, 802.1x media access control, secure boot Multi-language English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, Chinese, Korean, Japanese and more Upgrade/Provisioning Firmware upgrade via FTP / TFTP / HTTP / HTTPS, mass provisioning with GDMS (Grandstream Device Management System), TR-069 or AES encrypted XML configuration file Power & Green Energy Efficiency Universal power adapter included: Input: 100 - 240V; Output: +12VDC, 1A Integrated Power-over-Ethernet (802.3af) Max power consumption 6.3W (power adapter) or 7.4W (PoE) Temperature and Humidity Operation: 0°C to 40°C, Storage: -10°C to 60°C Humidity: 10% to 90% Non-condensing Package Content GRP2615 phone, handset with cord, phone stand, 12V power adapter, network cable, Quick Installation Guide, GPL license Physical Dimension: ; Unit weight: 970g ; Package weight: 1480g Dimension: 243mm x 210mm x 82.3mm Compliance FCC: Part 15 Class B; Part 15 Subpart C, 15.247; Part 15 Subpart E, 15.407; FCC Part 68 HAC CE: EN 55032; EN 55035; EN 61000-3-2; EN 61000-3-3; EN 62368-1; EN 301489-1; EN 301489-17; EN 300328; EN 301893; EN 62311 RCM: AS/NZS CISPR32; AS/NZS 4268; AS/NZS 62368.1; AS/CA S004. IC: ICES-003; CS-03; RSS-247; RSS-102. Learn More