Yealink SIP T53 Manual

The Yealink SIP T53 is a high-performance IP phone designed for business environments, featuring a 5-inch color LCD screen, support for up to 12 SIP accounts, HD voice with wideband audio, built-in dual Gigabit Ethernet ports, PoE support, integrated Bluetooth, Wi-Fi capability (optional), and advanced call management features. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Advanced Call Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 5-inch color LCD, Handset, Base unit, Power adapter, Ethernet cable, Quick start guide.

Feature	Description
Display	5-inch color LCD with 480 x 272 resolution
SIP Accounts	Supports up to 12 SIP accounts
Audio	HD voice with Opus, G.722, G.711 codecs
Network	Dual Gigabit Ethernet ports with PoE (802.3af)
Wireless	Integrated Bluetooth, optional Wi-Fi module
Expansion	Support for Yealink expansion modules
Headset Port	3.5mm headset jack for hands-free operation
Conference	Built-in speakerphone for conference calls
Security	SRTP, TLS, 802.1X network authentication
Firmware	Field upgradable via web interface or TFTP

Installation

Unpack and inspect contents. Place on stable surface.

Connect network: Use Ethernet cable to connect LAN port to network switch/router.
Power connection: Use included power adapter or PoE from switch.
Connect handset: Plug handset cord into dedicated port on base unit.
Optional headset: Connect to 3.5mm headset jack if needed.

WARNING! Use only Yealink-approved power adapter. Ensure proper ventilation around device.

First-Time Setup

Power on phone; follow on-screen prompts.

Network configuration: Phone will attempt DHCP; check IP address on screen.
SIP account setup: Enter SIP server, username, password provided by IT admin.
Time/Date: Set automatically via NTP or manually in settings.
Language: Select preferred language (default ENGLISH).
Test call: Make test call to verify audio quality and connectivity.

CAUTION! Keep phone away from liquids and extreme temperatures.

Specifications

Display: 5-inch color LCD, 480 x 272 pixels.
Protocols: SIP RFC3261, TCP/IP, UDP, RTP, RTCP.
Audio Codecs: Opus, G.722, G.711A/μ, G.729, G.726, iLBC.
Network: Dual 10/100/1000 Mbps Ethernet, PoE 802.3af.
Wireless: Bluetooth 4.2, optional Wi-Fi 802.11a/b/g/n/ac.
Power: 12V DC, 1.5A or PoE (802.3af).
Operating Temp: 0°C to 40°C (32°F to 104°F).
Dimensions: 220mm x 200mm x 70mm (W x D x H).
Weight: 1.2 kg (with handset).

Controls and Settings

Access menu via physical buttons or touch screen. Front Panel: LCD touch screen, Navigation keys, Volume keys, Mute, Headset, Speakerphone.

Physical Buttons: Line keys (12), Hold, Transfer, Conference, Voicemail, Directory, Redial, Mute, Speakerphone, Volume controls.

Basic Settings: Language, Time/Date, Screen brightness, Ringtone selection. Network: Static/DHCP, VLAN, QoS. SIP Accounts: Server address, authentication, display name. Audio: Handset volume, speaker volume, headset volume, codec priority. Features: Call forward, DND, auto answer, BLF.

Connecting Devices

Network: Ethernet cable to LAN port. Headset: 3.5mm jack. Expansion: Connect Yealink expansion module via dedicated port.

Turn off phone before connecting additional devices.
Match cables to correct ports (Ethernet to LAN, headset to headset jack).
For Wi-Fi: Insert optional Wi-Fi module and configure via web interface.

Tip: Use shielded Ethernet cables in environments with high EMI.

Advanced Call Features

Supports advanced PBX features via SIP.

Call Hold: Press Hold button during active call.
Call Transfer: Press Transfer, enter destination number, press Transfer again.
Conference: Press Conference, dial first participant, press Conference again, dial second participant.
Call Forward: Configure via menu or * codes from service provider.
BLF (Busy Lamp Field): Monitor status of other extensions.
Directory: Store up to 1000 contacts with quick dial.
Call History: View missed, received, and placed calls.
Voicemail: Access via voicemail button or dial voicemail number.

WARNING! Do not use phone during electrical storms. Unplug during lightning activity.

Accessibility Features

Visual: Adjustable screen brightness, high contrast mode. Audio: Adjustable ring volume, distinct ring patterns, hearing aid compatible (HAC) handset. Physical: Large buttons, tactile feedback.

Care & Cleaning

Unplug before cleaning. Use slightly damp cloth for exterior; dry immediately. Do not use abrasive cleaners or solvents.

CAUTION! Never spray liquids directly on phone. Keep handset cord away from heat sources.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. CE, RCM, UKCA marked. Contains FCC ID: 2ABAP-T53. For EU: Complies with RED 2014/53/EU. Copyright © Yealink Inc. All rights reserved. For support, visit www.yealink.com or contact your local distributor.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No display/power	Power connection	Check power adapter/PoE connection; try different outlet.
No network connectivity	Cable/DHCP	Check Ethernet cable; verify DHCP server is active.
One-way/no audio	Network/Codec	Check QoS settings; verify codec compatibility with server.
Cannot register to SIP server	Credentials/Network	Verify username/password; check firewall allows SIP traffic.
Poor call quality	Network congestion	Enable QoS; check for network latency/packet loss.
Buttons not responding	Software issue	Restart phone; update to latest firmware.

Reset: Press and hold OK button for 10 seconds during boot for factory reset.

Service: Contact Yealink support or authorized service center. Web: www.yealink.com