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OpenVPN Feature on Yealink IP Phones V1.0
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About this document
About the OpenVPN Feature on Yealink IP Phones V1.0
A Yealink document for the Yealink SIP-T52S (31 pages). This is version 1.0, last updated by Yealink on April 3, 2026, and you can read it right here or download it.
The SIP-T52S 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.
SIP-T52S is end of life. Support options, dates and replacementsWhat’s inside
- About VPN
- Types of VPN Access
- VPN Technology
- Example Use of a VPN Tunnel
- Yealink IP Phones Compatible with VPN
- Installing the OpenVPN Server
- Linux Platform
- Installing and Configuring the OpenVPN Server
- Creating the OpenVPN TAR File for the VPN Client
- Windows Platform
- Configuring OpenVPN Feature on IP Phones
- Configuring the OpenVPN Feature using Configuration Files
- Configuring the OpenVPN feature via the Web User Interface
- Enabling the OpenVPN Feature via the Phone User Interface
- Troubleshooting
- Why does the phone fail to connect to the OpenVPN server?
- How to change the signature algorithm of the certificate?
- Why does the phone fail to register to the SIP server after successfully connecting to the OpenVPN server?
- Why does the phone fail to register when the domain name of the SIP server is configured on the IP phone?
- Why there is no sound during a call?
- Why the voice quality is poor?
- Glossary
- Example Configuration Files
- Server Configuration File
- Client Configuration File
Phones covered
Yealink phones this document covers
Versions
Other versions of this document
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FAQ
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.