Any way to show how many channels in a trunk are being used?

As of now we have 3 trunks; A primary and a secondary from voice pulse and a third one from Cox. The two voicepulse trunks have 4 channels each and we’re trying to find a way to monitor how many channels are being used at any given moment. Is there a command line way of doing this?

Third party module that generates graphs showing concurrent calls as well as other info: