Grandstream BLF Keys greyed out


I have the problem that sometimes my BLF Keyes are greyed out (with a interrogation mark), after a phone reboot. - Afterwards if i set the keys new (again) and save it, then the blf status is correctly there.

Any ideas what could be the problem?

Thanks a lot

Most likely the BLF subscriptions are not being updated often enough.

I would lower the time to see if that helps.

What models are you using?
Is this happening to multiple people?
How are you setting up the phone?
What FreePBX version are you on?
Are all of your modules updated?

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