Hopefully this is just a rookie error and something simple. As the title says i'm having issues provisioning a grandstream phone. This setup is in a test enviroment with 1 handset and a couple of web clients. All works fine except when provisioning the handset. I can register the phone with the 3cx pbx but the phone itself doesnt appear to register the extension. Does anything specific need to be done on the phone to register the extension? I've followed both guides to provision the phone on the 3cx website but to no avail. Once the phone is manually provisioned it appears in 3cx but doesnt seem to have the extension registered, even though it is registered against the correct extension. Any ideas?