How do I configure a BLF list on a YEALINK SIP-T48U? I created a BLF list in the cloud PBX (Beeline), received the BLF List URI, and inserted it into the phone settings. In the Dsskey -> Line Key settings, I selected the BLF list type, but the contacts from the list are not appearing on the phone’s main screen. What am I doing wrong, or could the problem be on the cloud PBX side?
Setting up BLF list on YEALINK SIP-T48U requires proper configuration on both the phone side and the cloud PBX side. The reason contacts don’t appear on the main screen is likely due to incorrect BLF parameter settings or URI format mismatch between the phone and PBX.
Contents
- What is BLF list and how it works
- Step-by-step setup of BLF list on YEALINK SIP-T48U
- Checking and troubleshooting
- Setup specifics for Beeline cloud PBX
- Additional parameters and recommendations
What is BLF list and how it works
BLF (Busy Lamp Field) is a function of IP phones that allows displaying the status of other subscribers in real time. When you set up a BLF list, the phone shows the availability of staff, which is especially useful in offices with multiple lines.
On the YEALINK SIP-T48U, BLF list works as follows:
- Buttons on the display show the status of monitored subscribers (green - available, red - busy on a call, blinking - incoming call)
- When pressing a BLF button, you can intercept another employee’s call
- Supports up to 6 physical BLF keys on the main panel
Important: For the call interception function to work, you need to update the firmware from the official Yealink.com website, as older versions may not support full BLF functionality.
Step-by-step setup of BLF list on YEALINK SIP-T48U
Step 1: Preparation on the cloud PBX side
- In the Beeline cloud PBX interface, create a BLF list with the required internal numbers
- Copy the obtained BLF List URI - it should have a format like:
sip:1234@pbx.beeline.ruor similar - Ensure that “Dialog Info Call Pickup” function is enabled for each number in the list
Step 2: Accessing the phone’s web interface
- Find the IP address of your YEALINK SIP-T48U (usually displayed on the phone screen or in network settings)
- Open a browser and navigate to:
http://[phone-IP-address] - Log in (username/password is usually:
admin/admin)
Step 3: Setting up SIP account
- Go to Account → Account 1 (or another required account)
- Ensure the following are properly configured:
- Display name (name to display)
- User name (login)
- Password
- Domain (cloud PBX domain)
- Save the settings
Step 4: Setting up BLF list
- Go to DSS Key → Line Key
- Select an available button (Line Key 1-6)
- Configure the parameters:
- Type: Select BLF List
- Value: Paste the copied BLF List URI
- Label: Enter a list name (e.g., “Team”)
- Save the settings
Step 5: Verification and application
- Reboot the phone (Settings → Maintenance → Reboot)
- After loading, check the main screen - contacts from the BLF list should be displayed
Checking and troubleshooting
If contacts don’t appear, check the following points:
1. BLF List URI format
Ensure the URI has the correct format. For Beeline cloud PBX, typical formats are:
sip:list_id@domain.comsip:internal_number@domain.comusername:password@domain.com
2. Function compatibility
Check that Dialog Info function is enabled in the cloud PBX:
- Without this function, the phone will not receive call status information
- In PBX settings, find the “Dialog Info Call Pickup” parameter and enable it
3. Network connection check
Ensure the phone is properly registered to the PBX:
- In the web interface, check the registration status (Account Status)
- If status is “Registered” - the problem is in BLF settings
- If status is “Unregistered” - check network settings and authentication
4. Firmware check
According to Yealink documentation, the latest firmware version is required for BLF list to work:
- Check the current version (Settings → Status → Version)
- If necessary, update via the web interface
5. Testing with individual BLF
If the list doesn’t work, try setting up an individual BLF for one number:
- Type: BLF
- Value:
sip:number@domain.com - If this works, the problem is with the URI format for the list
Setup specifics for Beeline cloud PBX
Configuration on the PBX side
- In the Beiline interface, go to the “BLF lists” section
- Create a new list and add internal numbers
- Enable the “Call Pickup” function for each number
- Copy the obtained URI - it should contain the list ID
Typical integration errors
- Incorrect URI format: Beiline uses specific URI formats for BLF lists
- Disabled functions: Check that the following are enabled:
- Dialog Info
- Call Pickup
- BLF Status
- Access restrictions: Ensure the phone has call interception rights
Version compatibility
According to sources from Mango-Office, some BLF functions depend on the firmware version:
- Version 84 and above: full BLF list support
- Versions below 80: possible limitations
Additional parameters and recommendations
Performance optimization
- Number of monitored numbers: YEALINK SIP-T48U supports up to 29 BLF keys with expansion module
- Status update frequency: Status update frequency depends on cloud PBX settings
- Caching: Periodic phone reboot helps clear cache
Alternative setup methods
- Via XML file: You can create an XML configuration for mass setup
- Terminal setup: CLI access for advanced users
- Automatic setup: Using TFTP server for automatic configuration
Integration with other functions
BLF list can be combined with:
- Speed Dial: Quick dialing from the list
- Park Orbit: Call parking
- Intercom: Internal communication
Example of comprehensive setup: On one button, you can configure BLF with interception function, and on another - BLF list for monitoring a team of employees.
Sources
- Yealink SIP-T48U | instruction | setup | buy at Sip-Store.ru
- Setting up BLF and call interception on Yealink | Mango-Office
- Setting up Yealink T48G phone | Voxlink
- Setting up Yealink SIP phones | General documentation
- Yealink setup instructions for cloud PBX | Novofon
- Webinar “Setting up advanced Yealink functions” | IPmatika
- Webinar “Connecting Yealink SIP phones” | IPmatika
Conclusion
The main reasons BLF list may not work on YEALINK SIP-T48U:
- Incorrect BLF List URI format - the most common problem, especially with cloud PBX
- Disabled Dialog Info function on the PBX side
- Outdated phone firmware
- Incorrect call interception rights
Recommended actions:
- Check the URI format in your cloud PBX Beiline documentation
- Update the phone firmware to the latest version
- Test the function with individual BLF before setting up the list
- Contact Beiline technical support to check if required functions are activated
For successful BLF list setup, it’s important to understand that the problem can be on either the phone side or the cloud PBX side. Sequential verification of each configuration step will help quickly identify and fix the issue.