Table of Contents
Setup A DSS / BLF - Speed Dial Key
The Yealink T4x series has a number of buttons that can be programmed to do a large number of actions. The most common ones are to setup a Busy Lamp Field (BLF) or speed dial.
BLF vs Speed Dial
A BLF should be used if you are setting it up for an internal extension. A BLF key functions as both a speed dial and a status indicator. You can press the key to call that extension or transfer a call to them, but the colors will also change depending on their status so you can know if they are on the phone or not before calling them.
A speed dial should be used for setting up a button to call to an outside number. This can be to a cell phone or any other third party phone where the status of the caller can't be monitored.
Setup a BLF
- Press and hold the button you want to setup until the configuration menu displays.
- Configure the following options
Type: BLF Account ID: Line 1 Label: Label Value: Extension you want to assign Extension: Leave blank. See below for advanced options. 
Call Intercept with BLF
Rather than leaving the Extension blank, you can use a special star code to enable call intercept. Call intercept allows you to use the same BLF key to retrieve a call that is ringing on that person's phone. The star code is different depending on if your company uses 3-digit extensions or 4-digit extensions. Enter the correct star code in the "extension" field above.
| 3-digit extensions: | *34 |
|---|---|
| 4-digit extensions: | *35 |
Setup a Speed Dial
- Press and hold the button you want to setup until the configuration menu displays.
- Configure the following options
Type: Speed Dial Account ID: Line 1 Label: Label Value: Phone number you want to assign 
