AGI Rx << VERBOSE "(" 1
  airstar (
AGI Tx >> 200 result=1

AGI Rx << VERBOSE "    [code] => 510" 1
  airstar:     [code] => 510
AGI Tx >> 200 result=1

AGI Rx << VERBOSE "    [result] => " 1
  airstar:     [result] =>
AGI Tx >> 200 result=1

AGI Rx << VERBOSE "    [data] => Invalid or unknown command" 1
  airstar     [data] => Invalid or unknown command
AGI Tx >> 200 result=1

AGI Rx << VERBOSE ")" 1
  airstar )
AGI Tx >> 200 result=1

AGI Rx << VERBOSE "" 1
  airstar:
AGI Tx >> 200 result=1

AGI Rx << I>
AGI Tx >> 510 Invalid or unknown command

AGI Rx <<
AGI Tx >> 510 Invalid or unknown command