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Use the Download button on this page (580 KB), or read it in the preview above. The file is Yealink's original technical note.

Which phones does this technical note cover?

It applies to SIP-T33G and SIP-T33P.

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Yealink technical note

Using Security Certificates on Yealink IP Phones V1.4

A Yealink technical note for the Yealink SIP-T33G and SIP-T33P (26 pages).

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About this technical note

About the Using Security Certificates on Yealink IP Phones V1.4

A Yealink technical note for the Yealink SIP-T33G and SIP-T33P (26 pages). This is version 1.4, last updated by Yealink on May 25, 2026, and you can read it right here or download it.

Some of the phones it covers (SIP-T33P) are end of sale or end of life. We still support them, and this document still applies.

SIP-T33P is end of sale. Support options, dates and replacements

What’s inside

Introduction
Configuring Trusted Certificates on Yealink IP Phones
Configuring Trusted Certificate via Web User Interface
Configuring Trusted Certificate Using Configuration Files
For Old Auto Provisioning Mechanism
For New Auto Provisioning Mechanism
Configuring Device Certificates on Yealink IP Phones
Configuring Device Certificates via Web User Interface
Configuring Device Certificates Using Configuration Files
Using Certificates on Yealink IP Phones
Appendix A X.509 Certificate Structure
Appendix B Trusted Certificate Authority List
Appendix C Creating Custom Certificates

Phones covered

Yealink phones this technical note covers

SIP-T33G

SIP-T33PEnd of Sale

Versions

Questions about this document

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Yealink and Yealink product names are trademarks of Yealink Network Technology Co., Ltd. Product information, images and documents are published by Yealink and provided here for reference by smplVoice. Firmware and documents are Yealink’s original, unmodified files.