Snom D315 provisioning issue

[Chris@rocketrefreshments.]

Hi
We have a new team member starting who is going to be based at a different location than our main office.
Our 3cx is self hosted on google cloud.
I have got a Snom D315, factory reset, and set it up as a new user in the dashboard. When I connect the phone it connects to the provisioning server fine and downloads the users name etc to the phone, but doesn't seem to fully connect to the system. The box on the screen has an X in it, and when you look under details it says "key unassigned".
Anyone got any suggestions as to where I'm going wrong?

The phones in the main office are all connected by an SBC, they work fine. I have set the remote phone to connect via "local lan / vpn" and chosen our [email protected] in the dropdown rather than selecting the sbc.

 

[AWS2P]

Hi, if the D315 is not on same Lan as the main office where you use a SBC , so the D315 needs another SBC to connect to the PBX. except if you have a VPN connection with the main office then it should be connected through the existing main office SBC .

In the worst case another SBC installed on the second location should fix this or a phone model including router feature.