FreeSBC NAPs status is showing if the NAP is registered or not. Please do the following; Go to NAPs → Status → Select the NAP then scroll down. You will see Registration struct section. In this section, you will NAP registration status.
I found the status as you described and it’s not registered.
The ITSP informed me the following:
We are seeing registration attempts coming through, we are sending back requesting for digest authentication however then we don’t receive anything back from your side.
Thanks to the great support team, they were able to work out the issue.
The main issue was that NAT wasn’t enabled on the SBC in order to present the public IP address I was behind and also the REALM field hadn’t been populated.
All of this was under the External NAP setting.