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Using Security Certificates on Yealink Skype for Business HD IP Phones V9.11

A Yealink document for the Yealink T55A Skype for Business (17 pages).
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About this document

About the Using Security Certificates on Yealink Skype for Business HD IP Phones V9.11

A Yealink document for the Yealink T55A Skype for Business (17 pages). This is version 9.11, last updated by Yealink on October 21, 2025, and you can read it right here or download it.

The T55A Skype for Business has been discontinued by Yealink, but it's still widely used, and this document is still the reference for setting it up. The Tech Team™ supports end-of-life Yealink phones and can help you plan a replacement when you're ready.

T55A Skype for Business is end of life. Support options, dates and replacements

What’s inside

  1. Introduction
  2. Configuring Trusted Certificates on Skype for Business phones
  3. Configuring Trusted Certificate via Web User Interface
  4. Configuring Trusted Certificate Using Configuration Files
  5. Configuring Device Certificates on Skype for Business phones
  6. Configuring Device Certificates Using Configuration Files
  7. Using Certificates on Skype for Business phones
  8. Appendix A X.509 Certificate Structure
  9. Appendix B: Trusted Certificate Authority List
  10. Appendix C Creating Custom Certificates

Phones covered

Yealink phones this document covers

Yealink T55A Skype for Business
T55A Skype for BusinessEnd of Life

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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.