== Spawn extension (SJH-AAPT, 93353699, 5) exited non-zero on 'Zap/108-1'
    -- Hungup 'Zap/108-1'
zap show     -- Attempting call on Zap/g4/0409227633 for 0409227633@barnet-callback:1 (Retry 1)
    -- Requested transfer capability: 0x00 - SPEECH
channel principle:13 x:1
    -- Moving call from channel 95 to channel 107
95
Channel: 95
File Descriptor: 105
Span: 4
Extension: 
Dialing: no
Context: SJH-AAPT
Caller ID: 
Calling TON: 0
Caller ID name: 
Destroy: 0
InAlarm: 0
Signalling Type: ISDN PRI
Radio: 0
Owner: <None>
Real: <None>
Callwait: <None>
Threeway: <None>
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: yes
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: alaw
Fax Handled: no
Pulse phone: no
Echo Cancellation: 128 taps unless TDM bridged, currently OFF
PRI Flags: 
PRI Logical Span: Implicit
Actual Confinfo: Num/0, Mode/0x0000
Actual Confmute: No
Hookstate (FXS only): Onhook
*CLI>     -- Executing [0409227633@barnet-callback:1] NoOp("Zap/4:107-1", "callback time") in new stack
    -- Executing [0409227633@barnet-callback:2] Answer("Zap/4:107-1", "") in new stack
    -- Executing [0409227633@barnet-callback:3] AGI("Zap/4:107-1", "callback2.agi|") in new stack
    -- Launched AGI Script /var/lib/asterisk/agi-bin/callback2.agi
Use of uninitialized value in concatenation (.) or string at /usr/lib/perl5/site_perl/5.8.8/Asterisk/AGI.pm line 315, <STDIN> line 20.
    -- <Zap/4:107-1> Playing 'digits/6' (language 'en')
    -- <Zap/4:107-1> Playing 'one-moment-please' (language 'en')
ast_readstring_full > ast_waitstream_full
ast_readstring_full < ast_waitstream_full: 0
ast_readstring_full > ast_waitfordigit_full
zap show channel 95
Channel: 95
File Descriptor: 105
Span: 4
Extension: 
Dialing: no
Context: SJH-AAPT
Caller ID: 
Calling TON: 0
Caller ID name: 
Destroy: 0
InAlarm: 0
Signalling Type: ISDN PRI
Radio: 0
Owner: <None>
Real: <None>
Callwait: <None>
Threeway: <None>
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: yes
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: alaw
Fax Handled: no
Pulse phone: no
Echo Cancellation: 128 taps unless TDM bridged, currently OFF
PRI Flags: 
PRI Logical Span: Implicit
Actual Confinfo: Num/0, Mode/0x0000
Actual Confmute: No
Hookstate (FXS only): Onhook
*CLI> zap show channel 107
Channel: 107
File Descriptor: 117
Span: 4
Extension: 
Dialing: no
Context: SJH-AAPT
Caller ID: 
Calling TON: 0
Caller ID name: 
Destroy: 0
InAlarm: 0
Signalling Type: ISDN PRI
Radio: 0
Owner: Zap/4:107-1
Real: Zap/4:107-1
Callwait: <None>
Threeway: <None>
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: no
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: alaw
Fax Handled: no
Pulse phone: no
Echo Cancellation: 128 taps unless TDM bridged, currently ON
PRI Flags: Call 
PRI Logical Span: Implicit
Actual Confinfo: Num/0, Mode/0x0000
Actual Confmute: No
Hookstate (FXS only): Onhook
*CLI> ast_readstring_full < ast_waitfordigit_full: 0