Yealink SIP-T48U SIP Phone — The Ultimate Touchscreen IP Phone for Modern Business Communication

Communication is the lifeblood of every successful business. Every call answered, every client conversation managed, every team collaboration facilitated — it all flows through your desk phone. So when the device at the centre of your business communications is slow, limited, or difficult to use, the entire organisation feels it. The Yealink SIP-T48U SIP Phone is the enterprise-grade, touchscreen IP phone that eliminates every friction point from your business communication experience — delivering crystal-clear HD audio, an intuitive colour touchscreen interface, and the advanced SIP functionality that modern businesses, call centres, and unified communications environments demand.

This is not a desk phone. This is a professional communication command centre — and it redefines what a business phone can be.

Built for executives, power users, receptionists, call centre agents, and any professional whose productivity depends on seamless, high-quality voice communication, the Yealink SIP-T48U combines a 7-inch multi-touch colour display, dual USB ports, and support for up to 16 SIP accounts into a device that is as intuitive to use as a smartphone and as powerful as any enterprise telephony platform demands.

Why the Yealink SIP-T48U Is the Business IP Phone That Sets the Standard

Yealink is the world’s leading provider of SIP-based communication hardware — and the SIP-T48U represents the pinnacle of their desk phone engineering. Designed for organisations that have moved to or are moving toward VoIP and Unified Communications platforms — including Microsoft Teams-compatible deployments, Cisco Webex, 3CX, Avaya, Asterisk, BroadSoft, and FreePBX — the SIP-T48U delivers a user experience that matches the sophistication of the platforms it integrates with.

Where traditional desk phones present a wall of physical buttons and a small monochrome screen, the SIP-T48U presents a vast, bright, responsive touchscreen interface that puts every function — call management, directory access, voicemail, conferencing, and feature activation — within a single tap. For organisations making the transition from legacy PBX systems to modern IP telephony, the SIP-T48U’s familiar smartphone-like interface dramatically reduces training time and accelerates user adoption.

In an era where communication quality is a competitive differentiator, the Yealink SIP-T48U is the phone that tells your clients, your partners, and your team that you take professional communication seriously.

Key Features & Technical Specifications

7-Inch Multi-Touch Colour Touchscreen — Communication at Your Fingertips

• Display: 7-inch 800 x 480 pixel capacitive multi-touch colour touchscreen — vivid, bright, and responsive to the touch
• Touch Technology: Capacitive multi-touch — the same technology used in premium smartphones, delivering precise, lag-free touch response for every tap, swipe, and pinch gesture
• Interface: Icon-based graphical user interface — intuitive navigation without any learning curve for users familiar with smartphones or tablets
• Adjustable Viewing Angle: Tiltable display stand allows the screen angle to be adjusted for optimal visibility from any seated or standing position
• On-Screen Directory: Access your full contact directory, call history, and speed dial contacts directly from the touchscreen without navigating physical button menus
• Visual Voicemail: View, manage, and play voicemail messages through an intuitive on-screen interface

HD Audio Technology — Every Conversation, Crystal Clear

• Wideband Audio: Yealink HD Voice technology delivers full-duplex wideband audio across the handset, speakerphone, and headset — capturing and reproducing the full frequency range of the human voice for conversations that feel natural, clear, and fatigue-free
• Yealink Noise Proof Technology: Advanced acoustic engineering eliminates background noise from both ends of the call — ensuring that office ambient noise, keyboard sounds, and background conversations don’t interfere with call clarity
• Full-Duplex Speakerphone: High-quality hands-free speakerphone with echo cancellation for clear, natural conference calls without the echo and feedback that plague lesser devices
• Hearing Aid Compatible Handset: Designed for compatibility with hearing aids — ensuring accessibility for all users
• Headset Port: 3.5mm headset jack for wired headset connectivity — compatible with all standard RJ-9 and 3.5mm headsets
• Dual USB Ports: USB-A ports support USB headsets, Bluetooth dongles, and Wi-Fi adapters for flexible audio peripheral integration

16 SIP Accounts — Unmatched Multi-Line Capability

• SIP Account Support: Registers up to 16 independent SIP accounts simultaneously — ideal for receptionists, executive assistants, call centre agents, and power users managing multiple lines
• 16 Line Keys: Sixteen programmable line keys with dual-colour LED indicators provide real-time visual status of all registered lines — immediately identifying available, busy, and ringing lines at a glance
• Busy Lamp Field (BLF): Monitor the call status of colleagues and extensions in real time — enabling efficient call handling, transfer decisions, and team coordination without verbal interruption
• Flexible Key Mapping: Line keys are fully programmable as speed dials, BLF indicators, call park keys, shared line appearances, or custom feature activations
• Shared Line Appearance (SLA): Multiple phones can share the same line appearance — enabling seamless call pickup and shared extension management across a team or department

Advanced Call Management — Professional Telephony at Every Level

• Simultaneous Calls: Handles up to 2 concurrent calls per SIP account — enabling call waiting, call transfer, and consultative transfer operations without dropping active calls
• 3-Way Local Conference: Merge up to three parties into a local conference call directly from the phone — no external conferencing bridge required
• Call Transfer: Blind transfer, attended (consultative) transfer, and semi-attended transfer — the full suite of professional call handling options
• Call Recording: Supports call recording via USB storage device connected to the phone’s USB port — enabling local, hardware-level call recording without a server-side recording solution
• Do Not Disturb (DND): Per-account DND configuration allows specific lines to be silenced without affecting other registered accounts
• Call Forward: Unconditional, busy, and no-answer call forwarding configurations per SIP account for comprehensive call routing management
• Auto Answer: Configurable auto-answer functionality for intercom, paging, and automated call flow applications
• Intercom & Paging: Built-in intercom functionality for direct internal communication and group paging across multiple phones

Dual USB Ports — The Feature That Sets the SIP-T48U Apart

• USB Port 1 (Rear): Primary USB-A port for connecting USB Bluetooth dongles (Yealink BT40/BT41) to enable wireless Bluetooth headset pairing and mobile phone audio integration
• USB Port 2 (Rear): Secondary USB-A port for connecting Wi-Fi adapters (Yealink WF40/WF50) for wireless network connectivity, or for USB call recording via flash storage
• Simultaneous Use: Both USB ports can operate simultaneously — enabling Bluetooth headset use alongside Wi-Fi connectivity, or Wi-Fi alongside USB recording storage
• USB Headset Support: Direct USB headset connectivity for compatible USB audio headsets — no separate headset amplifier or adapter required

Gigabit Ethernet & PoE — Enterprise Network Integration

• Dual Gigabit Ethernet Ports: Two integrated 10/100/1000 Mbps Gigabit Ethernet ports — WAN port for network connection, LAN port for daisy-chaining a PC or other network device through the phone
• Power over Ethernet (PoE): IEEE 802.3af PoE support — power the phone directly from your network switch without a separate power adapter, dramatically simplifying installation and eliminating desk cable clutter
• Optional AC Power: Included power adapter for deployments where PoE is not available
• Network Pass-Through: The integrated Gigabit LAN port eliminates the need for a separate network port at the desk — the phone and PC share a single network connection with no performance impact

Universal SIP Compatibility & Unified Communications Integration

• SIP Protocol: Full SIP (RFC 3261) compliance for universal compatibility with any standards-based IP PBX or hosted VoIP platform
• Compatible Platforms: Certified or compatible with 3CX, Asterisk, FreePBX, Avaya Aura, BroadSoft BroadWorks, Cisco Unified Communications Manager, Alcatel-Lucent, Mitel, Fanvil, and hundreds of SIP-based platforms
• Microsoft Teams: Yealink Teams-edition firmware available for native Microsoft Teams integration (verify compatibility with your Teams deployment)
• Yealink Management Cloud Service (YMCS): Cloud-based device management platform for remote provisioning, configuration, monitoring, and firmware updates across entire phone fleet deployments
• Opus Codec Support: Supports Opus, G.722, G.711, G.729A, G.726, G.723.1 voice codecs for optimal audio quality across any network condition
• SRTP & TLS Encryption: Secure Real-time Transport Protocol and Transport Layer Security ensure that voice communications are encrypted end-to-end — protecting call privacy in compliance with enterprise security policies

Security & Reliability — Enterprise-Grade Protection

• SRTP Encryption: All voice media streams encrypted using SRTP — protecting call content from interception on shared or public networks
• TLS Signalling Encryption: SIP signalling encrypted via TLS — securing call setup, authentication, and control data from network-level eavesdropping
• HTTPS Provisioning: Secure remote provisioning via HTTPS — protecting configuration data during auto-provisioning and firmware updates
• IEEE 802.1X Authentication: Enterprise network access control compliance for secure integration into controlled network environments
• VLAN Support: 802.1Q VLAN tagging for voice/data traffic separation on enterprise networks

Who Is the Yealink SIP-T48U Designed For?

C-Suite Executives & Senior Management

For executives who demand the best — the SIP-T48U’s 7-inch touchscreen, premium HD audio, and elegant design deliver a communication experience that matches their professional standards. The intuitive touchscreen interface puts the full directory, call history, and feature set within reach without requiring manual navigation, while the HD speakerphone enables crystal-clear conference calls from the desk without a separate conferencing device.

Receptionists & Front Desk Operators

No role in a business depends more on desk phone capability than the receptionist. The SIP-T48U’s 16 SIP accounts with BLF monitoring, real-time line status LEDs, and large touchscreen directory give receptionists the complete situational awareness they need to manage high call volumes, transfer calls accurately, and monitor colleague availability — all from a single, intuitive interface that reduces the chance of misdirected transfers and missed calls.

Call Centre Agents & Customer Service Teams

In a call centre environment where every second of handle time matters, the SIP-T48U’s HD audio quality, one-touch call transfer, programmable function keys, and USB headset support combine to create a workstation that keeps agents focused on the customer — not on navigating a complicated phone interface. The touchscreen call history and directory access eliminate the need for separate CRM screen lookups for basic contact information during live calls.

Executive Assistants & Personal Assistants

Managing calls on behalf of a senior executive demands a phone that makes it effortless to monitor multiple lines, hold and transfer calls fluidly, and identify callers before answering. The SIP-T48U’s shared line appearance, BLF indicators, and multi-account registration give executive assistants the complete call management toolkit they need to represent their principals professionally on every interaction.

IT & Telecommunications Managers

For the professionals responsible for deploying and managing enterprise telephony infrastructure, the SIP-T48U’s YMCS cloud management compatibility, auto-provisioning support, SRTP/TLS security, and universal SIP compliance make it the administrator’s phone of choice. Deploy hundreds of units remotely through YMCS, push firmware updates fleet-wide, and maintain security compliance — all without physically touching individual devices.

SMEs Moving to VoIP & Cloud Telephony

For small and medium businesses making the transition from traditional PSTN or legacy PBX systems to hosted VoIP or cloud telephony platforms, the SIP-T48U’s intuitive touchscreen interface and universal SIP compatibility make it the ideal bridge device — delivering an immediately familiar smartphone-like user experience that drives rapid staff adoption, while supporting the full SIP feature set that modern cloud PBX platforms offer.

Solving Your Most Critical Business Phone Challenges

❓ “Our current IP phones are difficult to use — staff constantly ask for help navigating features”

The SIP-T48U’s 7-inch capacitive touchscreen with icon-based graphical interface is the solution to this exact problem. The interface is modelled on the smartphone experience that every staff member already uses daily — making it immediately intuitive without any formal training. Features that required navigating nested menus on traditional IP phones are accessible in a single tap on the SIP-T48U’s touchscreen, dramatically reducing the need for IT support and staff training on basic telephony operations.

❓ “We need to monitor multiple lines and see colleague availability from one phone”

This is precisely what the SIP-T48U’s 16 SIP account registration and Busy Lamp Field (BLF) functionality is designed for. Register up to 16 independent SIP accounts and map each to a dedicated line key with dual-colour LED status indication — giving you real-time visual awareness of which lines are available, engaged, ringing, or on hold. BLF monitoring of colleague extensions provides the same status awareness for your team, enabling efficient call routing and transfer decisions without the need for verbal communication.

❓ “We want to use wireless headsets with our desk phones — is that possible?”

Yes — and the SIP-T48U’s dual USB ports make this effortless. Connect a Yealink BT40 or BT41 Bluetooth dongle to one of the USB ports to enable wireless Bluetooth pairing with compatible Bluetooth headsets — giving your users the freedom to move around their workstation during calls without being tethered to the desk. Simultaneously, the second USB port remains available for Wi-Fi connectivity or USB call recording, without any compromise to the Bluetooth functionality.

❓ “We’re concerned about the security of our voice communications on a shared network”

The SIP-T48U addresses enterprise security requirements comprehensively. SRTP encryption secures all voice media streams, TLS encryption protects SIP signalling, HTTPS provisioning safeguards remote configuration data, and IEEE 802.1X authentication integrates with enterprise network access control systems. For organisations in regulated industries — finance, healthcare, legal, government — the SIP-T48U’s security feature set provides the compliance-relevant encryption and authentication capabilities that enterprise security policies demand.

❓ “We need to deploy and manage a large fleet of IP phones across multiple locations — is centralised management possible?”

Absolutely. The SIP-T48U integrates fully with Yealink Management Cloud Service (YMCS) — a cloud-based device lifecycle management platform that enables remote provisioning, configuration deployment, firmware updates, status monitoring, and diagnostic access across your entire SIP-T48U fleet from a single web-based dashboard. For multi-site organisations, managed service providers, and enterprise IT teams managing dozens or hundreds of devices, YMCS eliminates the need for on-site configuration of individual phones and dramatically reduces telephony management overhead.

❓ “Our offices don’t have enough network points for both phones and computers at every desk”

The SIP-T48U’s integrated dual Gigabit Ethernet pass-through solves this precisely. Connect the phone to your network switch via the WAN port, then connect your PC to the SIP-T48U’s LAN port — the phone acts as a Gigabit network switch, providing full-speed network connectivity to the PC through the phone. One network point at the desk serves both devices simultaneously, with no performance degradation for either, eliminating the need for additional network infrastructure investment.

❓ “We’re evaluating 3CX, Asterisk, or a hosted VoIP provider — will the SIP-T48U be compatible?”

Yes — with virtually any SIP-based platform. The SIP-T48U’s full RFC 3261 SIP compliance ensures compatibility with every standards-based IP PBX and hosted VoIP platform on the market. Yealink maintains active interoperability certification programmes with major platforms including 3CX, BroadSoft, Asterisk, FreePBX, Avaya, Cisco, Mitel, and dozens of hosted providers — and publishes detailed configuration guides for each platform. Whether you’re deploying on-premise or moving to a cloud-hosted UCaaS solution, the SIP-T48U integrates seamlessly.

Yealink SIP-T48U vs. The Competition

On every dimension that determines the quality of a professional communication experience, the Yealink SIP-T48U leads decisively.

Complete Technical Specifications

Display & Interface

• Screen Size: 7-inch colour IPS LCD
• Resolution: 800 x 480 pixels
• Touch Type: Capacitive multi-touch
• Backlight: Adjustable LED backlight

Audio Performance

• Voice Codec: Opus, G.722, G.711a/u, G.729AB, G.726, G.723.1
• Audio Features: HD Voice, full-duplex speakerphone, echo cancellation, noise suppression
• Audio Interface: Handset (RJ-9), headset (RJ-9 + 3.5mm), USB audio

Connectivity

• Network Ports: 2x Gigabit Ethernet (10/100/1000 Mbps)
• USB Ports: 2x USB-A 2.0
• Power: IEEE 802.3af PoE or optional AC adapter (included)

SIP & Protocol Support

• SIP Accounts: Up to 16 simultaneous registrations
• SIP Standard: RFC 3261 compliant
• Transport: UDP, TCP, TLS
• Security: SRTP, TLS, HTTPS, 802.1X, VLAN

Physical Specifications

• Dimensions: 252mm x 227mm x 121mm
• Weight: Approximately 1kg
• Operating Temperature: 0°C to 40°C
• Power Consumption: PoE: max 9W | AC adapter: max 10W

In the Box — Ready to Deploy From the Moment It Arrives

• ✅ Yealink SIP-T48U IP Phone Unit
• ✅ Handset with Handset Cord
• ✅ Stand / Wall Mount Bracket
• ✅ Ethernet Cable
• ✅ Power Adapter (AC)
• ✅ Quick Start Guide

PoE-capable network infrastructure eliminates the need for the AC adapter entirely — simply connect the Ethernet cable to a PoE-enabled switch port and the SIP-T48U powers on and begins auto-provisioning immediately.

Build Your Complete Yealink Communication Ecosystem

The SIP-T48U is designed to serve as the centrepiece of a complete Yealink unified communications hardware ecosystem. Expand and enhance your deployment with:

• 🎧 Yealink BH72/BH76 Bluetooth Headsets — Premium wireless DECT/Bluetooth headsets for cord-free call handling, paired via Yealink USB dongle
• 📡 Yealink BT41 Bluetooth USB Dongle — Enables wireless Bluetooth headset pairing directly from the SIP-T48U’s USB port
• 📶 Yealink WF50 Wi-Fi USB Adapter — Adds wireless 802.11 a/b/g/n/ac Wi-Fi connectivity for cable-free desk deployment
• 📟 Yealink EXP50 Expansion Module — 60-key colour-screen expansion module for reception and operator console deployments requiring additional BLF and speed dial keys
• 📹 Yealink USB Camera — USB camera integration for video calling capabilities through compatible UC platforms
• ☁️ Yealink Management Cloud Service (YMCS) — Enterprise fleet management for remote provisioning, monitoring, and firmware management across all deployed SIP-T48U units

Why Yealink — The World’s Number One SIP Phone Manufacturer

Yealink’s position as the global market leader in SIP endpoint devices is not a marketing claim — it is a market share reality verified by independent industry analyst data. Serving customers in over 140 countries, with a product portfolio spanning desk phones, conference phones, video conferencing systems, headsets, and DECT solutions, Yealink has built its leadership position on a simple foundation: designing products that make professional communication genuinely better — more intuitive, more reliable, and more capable than the alternatives.

The SIP-T48U is the product of that philosophy applied to the flagship desk phone category — a device where no compromise was made on display quality, audio performance, connectivity, security, or management capability. It is the phone that Yealink builds for users who expect the best — and it delivers on that expectation every time.

Every SIP-T48U ships with a Yealink manufacturer warranty and is supported by a global network of certified resellers and technical support teams who understand enterprise telephony deployment at every scale.

Upgrade Your Business Communication — Add the Yealink SIP-T48U to Your Cart Today

The quality of your business communication reflects directly on the professionalism of your organisation. Every call handled with clarity, every transfer executed flawlessly, every multi-line situation managed with confidence — these are the moments that define your organisation’s communication reputation with clients, partners, and colleagues.

The Yealink SIP-T48U SIP Phone gives every user in your organisation the tool they need to communicate at that level — every call, every day. A 7-inch touchscreen that makes every function accessible in a single tap. HD audio that makes every conversation crystal clear. Sixteen SIP accounts that keep every line visible and every call manageable. Dual USB ports that support wireless headsets, Wi-Fi, and call recording simultaneously. And universal SIP compatibility that integrates seamlessly into any telephony platform your business already uses or plans to adopt.

This is the business phone that professionals deserve. And your team deserves it today.

✅ 7″ Multi-Touch Colour Touchscreen | ✅ 16 SIP Accounts | ✅ HD Wideband Audio | ✅ Dual USB Ports | ✅ Dual Gigabit Ethernet + PoE | ✅ SRTP & TLS Security | ✅ Universal SIP Compatibility | ✅ Bluetooth & Wi-Fi Ready | ✅ YMCS Cloud Management