A Well-Rounded SIP Phone for Clear Communications
The SIP-T43U IP phone is a feature-rich business tool for excellent communications and extended functionality. It is a 12-line IP phone that comes with a 3.7-inch large black-and-white screen and the EXP43 support. United Yealink Optima HD Voice technology and wideband codec of Opus, the T43U awards you the superb audio quality and crystal-clear voice communications. The phone feels quicker and more responsive when performing call features. Moreover, the T43U 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.
Easy Customization and High Expansibility
Accompanied by two USB ports, the T43U is your right-hand man in the office that makes Bluetooth, Wi-Fi, USB headset and USB recording possible, and you can use any two of them freely according to your needs to enrich phone features. Meanwhile, the phone not only has three pages of flexible buttons that can be easily programmed with 21 paperless DSS keys at most, but also can connect up to three expansion modules, for up to 180 additional buttons with a screen-based LCD display and LED system.
HD Audio
Yealink Optima HD Voice technology combines cutting-edge hardware and software with wideband technology for maximum acoustic performance. Being a totally open, highly versatile audio codec, Opus, is designed to perform a higher HD audio quality than other wideband codecs in a high network bandwidth; However, if your current network quality is poor, Opus can provide you with a better audio quality than other narrowband codecs. And its hearing aid compatible (HAC) handset helps the person who is with hearing loss to hear the voice more clearly.
Efficient Installation and Provisioning
Yealink T4U series supports efficient provisioning and effortless mass deployment with Yealink’s Redirection and Provisioning Service (RPS) and Boot mechanism to help you realize the Zero Touch Provisioning without any complex manual settings, which makes the T4U series simple to deploy, easy to maintain and upgrade. Furthermore, a unified firmware and auto-p template that applies to all T4U phone models, saves even more time and costs for businesses, as well as simplifies the management and maintenance.
Secure Transport and Interoperability
Yealink T4U series uses SIP over Transport Layer Security (TLS/SSL), which is the latest network security technology. It’s also compatible with leading soft switch suppliers, such as 3CX, Broadsoft Broadworks. Moreover, it is carried with dual fimrware images that gives you a enterprise-level protection to avoid bricking your system once upgrade failed. More information: Power | Power over Ethernet (PoE) | Yes |  | AC adapter input voltage | 100 - 240 V | | AC adapter output voltage | 5 V | | AC adapter output current | 1.2 A | | Power consumption (typical) | 2.2 W | Ports & interfaces | USB 2.0 ports quantity | 2 | | Ethernet LAN (RJ-45) ports | 2 | | RJ-9 ports quantity | 2 | | Expansion module support | Yes | | DC-in jack | Yes | Network | Ethernet LAN | Yes | | Wi-Fi | Yes | | Bluetooth | Yes | | Ethernet LAN interface type | Gigabit Ethernet | | Ethernet LAN data rates | 10,100,1000 Mbit/s | | Bluetooth version | 4.1 | | Supported network protocols | FTP/TFTP/HTTP/HTTPS, IPv6, LLDP/CDP/DHCP VLAN | | Quality of Service (QoS) support | Yes | | DHCP client | Yes | | Syslog | Yes | | Networking standards | IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af | Audio | Speakerphone | Yes | | Microphone mute | Yes | | Voice codecs | AGC, AJB, AMR-NB, AMR-WB, G.711Mu, G.711a, G.723.1, G.726, G.729ab, OPUS, PLC, VAD, iLBC | | Comfort noise generation (CNG) | Yes | | Packet loss concealment (PLC) | Yes | Packaging content | Number of handles included | 1 pc(s) | | Mounting kit | Yes | | Ethernet cable | Yes | | Handset | Yes | | Quick start guide | Yes | Display | Display | LCD | | Display diagonal | 3.7 " | | Display resolution | 360 x 160 pixels | | Backlight display | Yes | Phone features | Lines quantity | 12 lines | | Caller ID | Yes | | Phonebook capacity | 1000 entries | | Number of VoIP accounts | 12 | | Answering machine | Yes | | Call waiting | Yes | | Speed dialling | Yes | | Call hold | Yes | | Call forwarding | Yes | | Conference call | Yes | | Redialing | Yes | | Anonymous call | Yes | | Anonymous call rejection | Yes | | Full duplex | Yes | | Call return | Yes | | Call transfer | Yes | | Call history | Yes | | SIP registrar server | Yes | Performance | Dual-Tone Multi-Frequency (DTMF) modes | In-band, Out-of band, SIP info | | Hearing aid compatibility | Yes | Logistics data | Harmonized System (HS) code | 85171800 | Certificates | Sustainability compliance | Yes | | Sustainability certificates | REACH, RoHS | Operational conditions | Operating temperature (T-T) | -10 - 50 °C | | Operating relative humidity (H-H) | 10 - 95 % | Weight & dimensions | Width | 224.9 mm | | Depth | 206.2 mm | | Height | 174.9 mm | | Package width | 246 mm | | Package depth | 223 mm | | Package height | 120 mm | Design | Product type | IP Phone | | Product colour | Grey | | Handset type | Wired handset | | Wall mountable | Yes | | Mounting | Desk/Wall | Management features | Plug and Play | Yes |
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