; copy template
exten => callback_in,n,System(cd /var/lib/asterisk/agi-bin \; cp callback1.call.org callback1.call)
; put file a couple of seconds into the future
exten => callback_in,n,System(cd /var/lib/asterisk/agi-bin \; touch -t `date --date=\'+10 seconds\' \'+%Y%m%d%H%M.%S\'` callback1.call)
; mv callfile into spool directory
exten => callback_in,n,System(cd /var/lib/asterisk/agi-bin \; mv callback1.call /var/spool/asterisk/outgoing)