How to test Asterisk new installation?

This looked like a progress for a bit! After I disabled the “Register” option, the accounts went “online”.
I went ahead, registered another test extension, this time “chan_SIP” and registered another X-Lite app on another machine within the same network. The account went “green”, “enabled and ready to use”.
But when I was trying to place a call from one to another - no luck.
It did not really look like the accounts are connected to the server.
Then I played with the passwords, put a deliberately wrong password and X-Lite still reports the account as “enabled”. I guess this has nothing to do with being connected.

On the server dashboard, tab named “Asterisk” I see number of users offline = 1. No more, no less, and the number is not affected by how many X-Lite accounts I am using trying to connect to the server. There has been no users online ever registered on the graph.

Another thing I noticed on the server is the “Uptime” graph. Which has a green line for the “Asterisk uptime”. If I choose units “hours” or “days” I see that line all the way at the bottom of the graph, maybe meaning “offline”? I guess? If I switch the units to “weeks” - I see a point in the past where the green line was at the top and then dropped to the bottom. There are no units attached and I don’t really know what those graphs mean. There’s also a red line legended to “system uptime”. Right now both red and green are at the bottom of the plot, there’s also a blue line going from the bottom up and it’s legended to “since last reload”. Despite the “system uptime” being at the bottom, I am able to login to the webmanagement and console, so the system is definitely running.

Can you suggest any utilities that can test the connection and would have a meaningful output?