Astra 480i

Hi there

I am trying to configure an Aastra 480i to work as our conference room phone. The extension is set up - however, try as I might - I can’t seem to get the phone to keep it’s config file and connect. I have followed the instructions I can find online - but it’s just not keeping the config.

Not sure where to look or try.

We are running Asterisk/FreePBX -

Thanks for the help.