Auto-Provisioning does work but cannot call local extensions. Once I auto-provision the Fanvil phones it is registered to the PBX and can make outgoing and receive inbound calls on SIP but extension example 1000 cannot call extension 1001 on the local network. On the Fanvil there is a setting that has SIP Invite Restrict but still the same issue. If I manually register the Fanvil phone to the PBX, it works but not if it is auto-provisioned.
Does anyone know the cause or solution to this error?