You can type
rasterisk -rvv
To connect to the asterisk CLI console. At that prompt you will see live activity scroll by. A couple useful commands to get you started are:
sip show channels
To show current connect calls if they are SIP endpoints or trunks.
You can safely use exit or quit commands to exit the asterisk CLI and leave asterisk running in the background. There are many other commands that can find in the asterisk documentation.