Trunks display?

Hi Forum
My RasPBX (FreePBX has just 2 trunks and zero extensions.
It’s a simple little GSM gateway.
One trunk is IAX2, other trunk is chan_dongle.
Both are connected and working.
In the System Status widget that displays users and trunks, it shows only 1 trunk registered.
Just for curiosity, which of the 2 trunks would that graph be displaying ?

Edit. I suppose I should disable (or remove) each trunk in turn, and watch the graph widget for result/s.