Yealink SIP-T40G
Ultra-elegant business IP phone
End of Sale. See the EOL notice and replacement options- Brand
- Yealink
- Series
- T4 Series
- Model
- SIP-T40G
- Status
- End of Sale
- Documents
- 30 manuals & files
- Knowledge base
- 5 articles
End of Sale · still supported
We still support the Yealink SIP-T40G
Yealink has stopped selling the SIP-T40G, but plenty are still in use. The Tech Team™ keeps them working, and helps you move on only when it makes sense.
Setup & provisioning
Add, reset or re-provision SIP-T40G phones on your system, including new accounts and line keys.
Firmware & security
Install the last firmware Yealink released for the SIP-T40G and lock down its settings.
Latest firmwareTroubleshooting
Registration failures, one-way audio, dropped calls, boot loops and factory resets.
Replace when you're ready
Matched to a current Yealink model and set up with your extensions and buttons.
Replacement optionsOverview
About the Yealink SIP-T40G
and Yealink in its sole discretion will determine what fixes, if any, will be provided.
3) Yealink will not offer any New Features/Enhancements support after End-of-Life (EOL).
Gallery
SIP-T40G product photos
Documents
SIP-T40G manuals & downloads
Datasheets
1User Guides
2Admin Guides
2Quick Start Guides
1Deployment
2Other Downloads
21- Yealink SIP IP Phones XML Browser Developer's Guide V1.0PDFJun 15, 2026
- Yealink Configuration Encryption Tool User Guide V1.2PDFApr 3, 2026
- Calling and Connected Line Identification Presentation on Yealink IP PhonesPDFApr 3, 2026
- LDAP Directory on Yealink IP PhonesPDFApr 3, 2026
- Recovery Mode on Yealink IP Phones V86PDFApr 3, 2026
- Server Redundancy on Yealink IP PhonesPDFApr 3, 2026
Show 15 more other downloadsShow fewer
- OpenVPN Feature on Yealink IP Phones V1.0PDFApr 3, 2026
- Using Security Certificates on Yealink IP Phones V1.0.pdfFILEApr 3, 2026
- Using Ribbon Features on Yealink IP Phones V1.0PDFApr 3, 2026
- Using Enhanced DSS Keys on Yealink IP Phones V1.0PDFApr 3, 2026
- VLAN Feature on Yealink IP PhonesPDFApr 3, 2026
- Yealink 802.1X AuthenticationPDFApr 3, 2026
- Yealink Configuration Generator Tool User Guide V86PDFApr 3, 2026
- Instructions on Yealink's SDK for Yealink Android Phones V1.4PDFDec 3, 2025
- Yealink IP Phone Features Integrated with BroadSoft UC-One User Guide V1.3.pdfFILEOct 22, 2025
- Yealink SIP Phones Integrated with Metaswitch Configuring Guide V1.5PDFOct 22, 2025
- Yealink SIP Phones Integrated with Metaswitch CommPortal Phone Applications User Guide V1.6PDFOct 22, 2025
- Yealink Regulatory Notice V1.2PDFOct 22, 2025
- Yealink Limited WarrantyPDFOct 22, 2025
- Yealink Limited Warranty for the European Union and UKPDFOct 22, 2025
- Yealink IP Phones Deployment Guide for BroadSoft UC-One Environment V1.6PDFOct 22, 2025
Firmware
SIP-T40G firmware & release notes
- SIP-T40G 76.84.0.125 - FirmwareLatestROMReleased Jan 9, 2026 Download
Knowledge base
SIP-T40G how-to articles
Related
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Support & downloadsNeed help with your SIP-T40G?
The Tech Team™ can provision, update and troubleshoot your Yealink phones, and move your office onto smplVoice cloud voice.
Yealink and Yealink product names are trademarks of Yealink Network Technology Co., Ltd. Product information, images and documents are published by Yealink (source) and provided here for reference by smplVoice. Firmware and documents are Yealink’s original, unmodified files.