One of my VoIP providers tells me that my 3CX v15.5 installation is trying to re-register with their service every second - in spite of the fact that registration has already been successful and the connection is secure. There used to be a setting called 'Time between registration attempts' in previous versions of 3CX, but I can't find it in this latest version - only 'Re-register timeout' under each trunk (set by default to 3600). Am I just not looking hard enough? It couldn't be a Cisco SPA phone connected to the PBX triggering these events, could it? The Event and Activity logs don't seem nearly as detailed as they used to be, so I'm finding it hard to follow what's going on. Any help, please?