Yealink SIP T48U User Manual

The Yealink SIP T48U is a high-performance, color touchscreen IP phone designed for business environments. It features a 7-inch capacitive touchscreen, support for up to 16 SIP accounts, HD audio, dual Gigabit Ethernet ports, integrated Bluetooth, Wi-Fi capability (with optional module), USB recording, and extensive call management features. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: 7-inch capacitive touchscreen, handset, base unit, Ethernet cables, power adapter, Quick Start Guide.

Installation

Unpack and inspect contents. Place on stable desk surface.

1. Connect Network: Use Ethernet cable to connect LAN/PoE port to switch/router. For PoE, ensure switch provides 802.3af power.
2. Connect PC (optional): Use second Ethernet cable from PC port to computer.
3. Connect Handset: Plug coiled handset cord into handset port.
4. Connect Power: If not using PoE, plug 12V DC power adapter into power port and wall outlet.
5. Connect Headset (optional): Plug into headset port for hands-free operation.

WARNING! Use only Yealink-provided or certified power adapter. Ensure cables are not pinched or damaged.

First-Time Setup

Power on phone; follow on-screen prompts.

1. Network Boot: Phone will attempt to obtain IP via DHCP. Check IP address on screen (Menu > Status > Network).
2. Provisioning: Auto-provision via TR-069, TFTP, HTTP, or HTTPS from your PBX/server. Enter provisioning URL if required.
3. Account Configuration: Enter SIP server, username, password, and display name for each line via web GUI (http://[phone-IP]) or touchscreen.
4. Set Language & Time: In Settings > Basic > Preferences, select language and configure NTP server for time sync.
5. Test Call: Make a test call to verify audio and registration.

CAUTION! Keep phone away from direct heat sources and liquids.

Specifications

• Display: 7-inch TFT LCD, capacitive multi-touch, 480 x 800 pixels.
• Network: Dual 10/100/1000 Mbps Ethernet, IEEE 802.3af PoE.
• Protocols: SIP (RFC3261), TCP/IP, UDP, RTP, RTCP, HTTP, HTTPS, TR-069.
• Audio Codecs: G.711, G.722, G.729, G.726, Opus, iLBC, AMR-WB.
• Wireless: Bluetooth 3.0, optional 802.11a/b/g/n Wi-Fi module.
• Conference: 3-party audio conference.
• Power Supply: 12V DC, 1.5A or IEEE 802.3af PoE.
• Operating Temp: 0°C to 40°C (32°F to 104°F).
• Supported Services: Call forward, transfer, hold, park, DND, call waiting, caller ID, voicemail.

Controls and Settings

Access settings via touchscreen Menu or web interface (http://[phone-IP]). Physical Buttons: MUTE, HEADSET, SPEAKERPHONE, NAVIGATION, VOLUME.

Touchscreen: Home screen with lines, contacts, call history, features. Swipe for additional panels.

Basic Settings: Language, time zone, screen brightness, ringtone selection. Account Settings: SIP server, authentication, display name. Audio Settings: Handset volume, speaker volume, ring volume, codec priority. Network Settings: Static/DHCP, VLAN, QoS. Features: Call forward, DND, call waiting, speed dials.

Connecting Devices

Network: LAN/PoE port to network. PC: PC port to computer. Headset: Analog headset to headset port. USB: Flash drive for call recording or Bluetooth adapter.

1. Turn off phone before connecting wired accessories.
2. For Bluetooth, enable in Settings > Basic > Bluetooth, then pair device.
3. For Wi-Fi, insert optional module, then configure in Network > Wi-Fi Settings.

Tip: Use quality CAT5e or higher Ethernet cables for Gigabit performance.

Advanced Call Features

Supports advanced PBX features.

1. Make Call: Tap line key or dial number on keypad, then tap Call or press handset.
2. Answer Call: Tap Answer, press line key, or lift handset.
3. Hold: Tap Hold during call; resume by tapping line.
4. Transfer: Tap Transfer, dial target, tap Transfer again (blind) or wait for answer then tap Transfer (attended).
5. Conference: On active call, tap Conference, dial second party, tap Conference again to merge.
6. Call Forward: Enable via Features > Call Forward > Always/Busy/No Answer with target number.
7. Speed Dial: Assign numbers to programmable keys via web GUI.
8. Call Recording: Insert USB drive, tap Record during call (if enabled by PBX).

WARNING! Do not disconnect USB drive during recording to avoid data loss.

Accessibility Features

High-Contrast Theme: Enable in Settings > Basic > Display. Adjustable Font Size: In Display settings. Audio: Adjustable tone and volume for handset, speaker, ringer. Visual Alerts: LED indicators for missed calls/messages.

Care & Cleaning

Unplug power before cleaning. Use slightly damp, lint-free cloth for screen and body. Do not use abrasive cleaners or solvents.

CAUTION! Avoid liquid contact with ports and openings. Do not spray directly on phone.

Regulatory Information

FCC Part 15: Class A digital device; complies with limits for business use. CE, RCM, UKCA marked. Contains FCC ID: 2AJMTT48U. For EU, complies with RED 2014/53/EU. Copyright © Yealink Inc. For support, visit www.yealink.com or contact your reseller.

Troubleshooting

Reset: Press and hold OK key for 10 seconds during boot for factory reset (erases all settings).

Firmware Upgrade: Via web GUI (Maintenance > Upgrade) or auto-provisioning.

Service: Contact your system administrator or Yealink support at www.yealink.com.