Yealink administrator guide
Yealink Skype for Business HD IP Phones Administrator Guide V9.17
Loading document preview…
About this administrator guide
About the Skype for Business HD IP Phones Administrator Guide V9.17
The administrator guide for the Yealink T55A Skype for Business: configuration, provisioning, security and feature setup (176 pages). This is version 9.17, 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 replacementsWhat’s inside
- Introduction
- Related Documentations
- Typographic and Writing Conventions
- Recommended References
- Getting Started
- Initialization Process Overview
- Loading the ROM File
- Configuring the VLAN
- Querying the DHCP (Dynamic Host Configuration Protocol) Server
- Contacting the Provisioning Server
- Updating Firmware
- Downloading the Resource Files
- Verifying Startup
- Skype for Business Feature License
- Importing License via the Web User Interface
- Importing License Configuration
- Signing into Skype for Business
- PIN Authentication
- PIN Authentication Configuration
- User Sign-in
- User Sign-in Configuration
- Web Sign-in
- Web Sign-in Configuration
- Signing Out of Skype for Business Configuration
- Device Network
- IPv4 and IPv6 Network Settings
- IP Addressing Mode Configuration
- IPv4 Configuration
- IPv6 Configuration
- DHCP Option for IPv4
- Supported DHCP Option for IPv4
- DHCP Option 160 and Option 161
- DHCP Option 66, Option 43 and Custom Option
- DHCP Option 42 and Option 2
- DHCP Option 12
- DHCP Option 60
- DHCP Option 120
- VLAN
- LLDP Configuration
- CDP Configuration
Phones covered
Yealink phones this administrator guide covers
FAQ
Questions about this document
Quick answers, and The Tech Team™ is a call away if you need more.
Need help with your T55A Skype for Business?
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 and provided here for reference by smplVoice. Firmware and documents are Yealink’s original, unmodified files.