It could be a couple of things.

First just switch off your router and phone then restart your router and phone - in that order. That may sort it out.

If not, then either add or subtract the nat proxy - ie whichever way you have it now, try reversing it.

check you have the most recent version of the elmeg's firmware.

It may be a DNS issue so try adding the IP address instead of sip.voipfone.co.uk

and then add the IP of the NAT if necessary

nat is

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