Shell Programming and Scripting

#!/bin/bash
typeset -i interval=5
run=true
trunk=vonage
reboot=0
while [[ "$run" == "true" ]]; do
   checktrunk=$(asterisk -rx "sip show peer $trunk" | grep -c "Status.*OK")
   if [[ $checktrunk -eq 0 ]]; then
      echo "$(date): SIP trunk registration failed."
      sleep 2
      {
      sleep 2
      echo admin
      sleep 2
      echo password
      sleep 2
      echo sys reboot
      echo exit
      } | telnet 192.168.1.1
      (( reboot += 1 ))
      if (( reboot == 3 )); then
      	sleep 600
      	reboot=0
      fi
    else
       echo "$(date): SIP trunk registration OK."
    fi
    sleep 5 
done
exit 1