pbx-un*CLI> zap show channel 1
Channel: 1> 
File Descriptor: 17
Span: 1CLI> 
Extension:  
Dialing: no 
Context: incoming
Caller ID:  
Calling TON: 0
Caller ID name: 
Destroy: 0> 
InAlarm: 1> 
Signalling Type: PRI Signalling
Radio: 0LI> 
Owner: <None>
Real: <None>
Callwait: <None>
Threeway: <None>
Confno: -1> 
Propagated Conference: -1
Real in conference: 0
DSP: noCLI> 
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: alaw
Fax Handled: no
Pulse phone: no
Echo Cancellation: 128 taps, currently OFF
PRI Flags:  
PRI Logical Span: Implicit
Hookstate (FXS only): Onhook