Yes, I'm running Asus-Merlin. I've tried turning SIP Passthrough off - and on. Seems to make no difference to the issue. These are my current settings.
My VoIP was working fine a few months ago, with the Grandstream HT801, Starlink, Andrews & Arnold service in the UK. However, over the weekend, I discovered that it's no longer working. There is no voice in either direction. You can call the phone and it rings, but the call is dead. Same in the...