Checking the number of current calls

The number of calls taking place at any time can be investigate from within the Asterisk CLI:

> core show channels

On a busy PBX it may sometimes be a little difficult to see the response to this query, if the system is processing calls at the same time.

It may then be necessary to issue the command from the linux terminal, rather than the asterisk CLI, so that the output is not lost in a stream of dialplan logging.

> sudo asterisk -rx "core show channels"