Following over 4 months of troubleshooting with Grandstream engineers, it has been determined that the BLF feature does not work when using the Anveo virtual PBX system. The phones fail to display a correct aspect after being in use for a short period of time because the Anveo server uses an incorrect phone ID number when attempting to send a BLF NOTIFY packet to other phones.
YouTube videos, we believe this to be false advertising on their part.
View our demonstration video:
Anveo-Grandstream BLF SMACKDOWN