# File lib/adhearsion/voip/asterisk/commands.rb, line 208
        def get_variable(variable_name)
          result = raw_response("GET VARIABLE #{variable_name}")
          case result
            when "200 result=0"
              return nil
              when /^200 result=1 \((.*)\)$/
                return $LAST_PAREN_MATCH
            end
          end