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If you are unsure what BLF is or would like a bit more detailed information about it, then you can click on the following to find out more: What is BLF?
To set up BLF on the Grandstream phones - the GXP1628 and above - you can follow the steps below:
For the value of your BLF key, while you can put the SIP Usernames of other users on your account for easy access to see whether they are on the phone - which can be found under Users - you can also put an extension number instead!
If you need any further help today, please don't hesitate to contact our friendly support team on 917 900 1929 or by email!