Skip to content
smplVoice

Yealink user guide

Yealink T4 Series IP Phones User Guide V84.80

Yealink's user guide for the Yealink SIP-T40G, covering everyday calling, contacts, voicemail and phone settings (132 pages).
Download PDF (6.2 MB) Get setup help

Newer version available: Yealink T4 Series IP Phones User Guide V86.15

Loading document preview…

About this user guide

About the T4 Series IP Phones User Guide V84.80

Yealink's user guide for the Yealink SIP-T40G, covering everyday calling, contacts, voicemail and phone settings (132 pages). This copy, last updated by Yealink on October 22, 2025, and you can read it right here or download it.

The SIP-T40G 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-T40G is end of sale. Support options, dates and replacements

What’s inside

  1. Before You Begin
  2. Related Documentation
  3. Getting Started
  4. Hardware Overview
  5. T48S/T48G Hardware
  6. T46S/T46G/T42S/T42G/T41S/T41P/T40P/T40G Hardware
  7. Power LED Indicator
  8. Line Key LED
  9. Screen and Icons
  10. Idle Screen
  11. Calls Screen
  12. Icons in the Status Bar
  13. Line Key Icons
  14. Entering Characters on T48S/T48G
  15. Using the Onscreen Keyboard
  16. Using the Phone Keypad and Dial Pad
  17. Entering Characters on T46S/T46G/T42S/T42G/T41S/T41P/T40P/T40G
  18. Call Features
  19. Changing the Default Account
  20. Placing Calls
  21. Placing a Call from the Dialer
  22. Placing Multiple Calls
  23. Placing a Call with a Speed Dial Key
  24. Placing a Call Back to the Last Incoming Number
  25. Redialing a Number
  26. Dialing a Hotline Number
  27. Placing an International Call
  28. Placing a Call from the Call History
  29. Placing a Call from the Directory
  30. Placing an Anonymous Call
  31. Placing Calls to Google Contacts
  32. Placing an Emergency Call from a Locked Phone
  33. Answering Calls
  34. Answering a Call
  35. Answering a Call When in a Call
  36. Answering a Call Automatically
  37. Switching Among the Handset, Speakerphone and Headset Modes
  38. Disabling Call Waiting
  39. Silencing or Rejecting Incoming Calls
  40. Silencing a Call

Phones covered

Yealink phones this user guide covers

Yealink SIP-T40G
SIP-T40GEnd of Sale

Versions

Other versions of this document

Related

More Yealink user guides

All user guides

FAQ

Questions about this document

Quick answers, and The Tech Team™ is a call away if you need more.

Contact us (800) 943-7675

Need help with your SIP-T40G?

The Tech Team™ can provision, update and troubleshoot your Yealink phones, and move your office onto smplVoice cloud voice.

Talk to a technician (800) 943-7675

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.