[root@asterisk ~]# asterisk -rx "show channels"
    -- Remote UNIX connection
Channel              Location             State   Application(Data)
Zap/4-1              036771437@from-pstn: Ringing AppDial((Outgoing Line))
SIP/212-b7d96730     s@macro-dialout-trun Ring    Dial(ZAP/g0/036771437|300|Tt)
Zap/5-1              (None)               Up      Bridged Call(SIP/210-b7dd7120)
SIP/210-b7dd7120     s@macro-dialout-trun Up      Dial(ZAP/g0/9999280|300|Tt)
Zap/2-1              (None)               Up      Bridged Call(SIP/219-b7de1d70)
SIP/219-b7de1d70     s@macro-dialout-trun Up      Dial(ZAP/g0/03|300|Tt)
Zap/3-1              s-spy@custom-chanspy Up      ChanSpy(SIP|)
Zap/1-1              (None)               Up      Bridged Call(SIP/211-b7d99118)
SIP/211-b7d99118     s@macro-dialout-trun Up      Dial(ZAP/g0/5385603|300|Tt)
9 active channels
5 active calls
Verbosity is at least 5