[Asterisk-Users] How to tell "Who's Online"?

[Brent Goran]

We have an Asterisk server online, with many SIP clients (some Sipuras,
some laptops), and we're also using some IAXy's.

I've been trying to find a simple way to check "who's online", meaning
who is reachable at the moment, without actually going through and
dialing everybody. Is there a way to do this with Asterisk? I am sorry
if I'm missing something obvious, but I couldn't find any console
command to show users online.

Thank you,

Brent