It looks as though the asterisk is currently offline, as of 2017-08-12 14:25:01 (BST)
I’m not sure yet the cause of this problem. It could be anything from a power failure, to the
dynamic dns failing to update, the router being offline, or the router having been reset losing the port forwarding configuration.
More information when I’ve got it.
Update 2017-08-12 22:11 – I don’t think it’s the Dynamic DNS this time. The asterisk regularly phones home to my monitoring server (a process that isn’t reliant on the Dynamic DNS) and it hasn’t reported in since 14:25.
Update 2017-08-13 12:00 Sam very helpfully went in, and found everything switched off. He powered up the UPS and we’re back in business… for now!