Features of Yealink desk phones
This article is about the features of Yealink® desk phones and how they interact with the services and features of One Net Business. Information applies to Yealink SIP-T42S, SIP-T46S and SIP-T48S unless stated otherwise.
How does my desk phone interact with One Net Business?
There are several features of your desk phone that interact directly with One Net Business.
- You can use Feature Access Codes (FACs) to do tasks including pulling a call onto your desk phone, parking a call or switching call forwarding on and off.
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Some buttons of your desk phone interact with specific One Net Business services.
Show me an example
For example, when you press the DND (Do Not Disturb) button on your desk phone, your availability changes to do not disturb for all your devices and locations. If you change your availability in another location, for example in the One Net app, your availability is also changed on your desk phone.
- Your desk phone has direct access to your One Net Business call history and your organisation's phone book, so you always see the latest information.
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You can personalise the programmable buttons of your desk phone using One Net Manager.
Buttons of Yealink desk phones
Your Yealink desk phone comes with a set of pre-configured buttons but each button can be personalised.

Personalising is choosing which functions your programmable buttons do. You can personalise desk phones in One Net Manager. The settings are part of your configuration file.

Don't personalise buttons locally on your desk phone
Your desk phone downloads and refreshes your configuration file every day. This means that anything you set locally on your desk phone, using the phone's buttons and menu, will be deleted.
Always personalise your desk phone in One Net Manager.

Button |
Default action |
|
---|---|---|
|
Up |
|
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Down |
|
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Left/Right |
|
|
Confirm |
Confirm the action or answer an incoming call |
|
Cancel |
Cancel or undo the previous action |
Button |
Default action |
|
---|---|---|
|
Headset |
|
|
Mute |
|
|
Message |
Dial the One Net Business voicemail menu |
|
Hold |
|
|
Redial |
Use One Net Business to dial the last number you called |
|
Transfer |
Transfer a call to another number |
|
Speaker |
|
Function buttons

The position and number of programmable function buttons depends on the model of Yealink desk phone.
Model |
Location |
Number of programmable function buttons |
---|---|---|
SIP-T42S |
|
15 |
SIP-T46S |
|
27 |
SIP-T48S |
|
29 |
You can map any feature to any of the programmable function buttons. The most common features are the following:
Feature |
Action |
---|---|
Line |
For desk phones that use more than one line, switch between One Net Business users. For example, an assistant might have a desk phone with their own line and also share their manager's line. The assistant can make calls either with their own line or with the manager's line. |
Line monitoring |
See if a specific colleague's phone line is busy. You can have several buttons all mapped to different colleagues. |
Speed dial |
Quickly call a specific phone number. You can have several buttons all mapped to different phone numbers. Note: these phone numbers do not have to match your organisation's speed dial list. For example, you could include a personal number, such as your spouse. |
Forwarding calls |
Set call forwarding on all your One Net Business devices:
|
Transferring calls |
Transfer a call to another number |
Do not disturb |
Block all incoming calls on all your devices |
Voicemail |
Dial the One Net Business voicemail menu |
Automatically distributed calls (ACD) |
Change the availability of your One Net Call Centre status |
You can set up your line monitoring buttons to see if your colleagues' phone lines are busy.
To set up line monitoring buttons
- Set up lines to monitor.
- Set up programmable keys to monitor other users' lines.
Read about setting programmable keys to monitor other users' lines
The order of the line monitoring buttons is defined by the order on the line monitoring list. To change the assigned user to another button, you need to change the order on the list.
GUI function buttons

On most of the models of Yealink desk phone the programmable Graphical User Interface (GUI) function buttons are underneath the phone's screen.
The models of Yealink desk phone with a touch screen do not have GUI function buttons underneath the phone's screen.
You can map any feature to any of the four programmable GUI function buttons. The default features for all models of Yealink are the following:
Feature |
Action |
---|---|
Call history |
See your One Net Business call history Set call forwarding on all your One Net Business devices:
|
Contacts |
See your organisation's One Net Business phone book |
Do not disturb |
Block all incoming calls on all your devices |
Menu |
Open the local settings menu Note: this button does not access your One Net Business settings |
Additional features
You can search for contacts directly from your Yealink desk phone.
To search for contacts
- Select Directory.
- Select Search.
- Use the keypad to enter the name or phone number of the contact.
- Select the contact from the result list.
The contacts matching the characters you enter appear on the LCD screen in real time.
You can use your Yealink desk phone to record a call on a USB drive.

USB drive requirements
The required file system is FAT32 and the maximum capacity is 4GB.
To connect a USB drive
- Connect the USB drive to your Yealink desk phone.
The icon in the status bar indicates that the USB drive is connected.
To check a USB drive connection
- Select .
- Select USB.
- Select Storage Space.
- If the USB drive is connected to your Yealink desk phone correctly, you will see the storage details.
- If the USB drive is not connected to your Yealink desk phone correctly, you will see a message to connect the USB drive.
To record calls
- During a call, select More.
- Select StartREC.
- If you want to pause the recording, select More > PauseREC.
- If you want to resume the recording, select More > ResumeREC.
- If you want to stop the recording, select More > StopREC.
The call is recorded on the connected USB drive.
To play recorded calls
- Select .
- Select USB.
- Select Browse Audio.
- Highlight the recorded call you want to play.
- Select Play.
- If you want to fast forward, select F.Fwd.
- If you want to rewind, select F.Rew.
Settings menu

Don't personalise settings locally on your desk phone
Your desk phone downloads and refreshes your configuration file every day. This means that anything you set locally on your desk phone, using the phone's buttons and menu, will be deleted.
Always personalise your desk phone in One Net Manager.
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