Hello Martin,
My provider budgetphone.nl is listed as "Not Registered" with Active = "Yes" and Register = "Yes", just like Richard experienced.
Kars, who bought el-cheapo hardware which doesn't support GW setting or a decent dial plan and didn't know he'd need that.
Edit: I think it has something to do with "SIP proxy" vs. "Domain/Realm". In my ATA I have to specify "Domain/Realm" as "budgetphone.nl" and "SIP Proxy" as "sip.budgetphone.nl". Setting either to be the same doesn't work. With "SIP Proxy" set to "budgetphone.nl" there is no DNS A record.
With "Domain/Realm" set to "sip.budgetphone.nl" the authentication fails with "Domain is not served here".
A way to specify both would be nice