Show channels command only shows the first call

A bug, feature or my misunderstanding?

I have one SIP provider and all outside calls go thorough it.

I make a call.
‘core show channels’ command shows two active channels and one call. This is correct.

I make a second call.
'core shoe channels’command still shows two active channels and one call. I suppose it should now list four channels and two active calls.

AsteriskNow GUI displays active channels as above. A bug?