# File lib/adhearsion/voip/call.rb, line 155
    def extract_failed_reason_from(environment)
      if originating_voip_platform == :asterisk
        failed_reason = environment.variable 'REASON'
        failed_reason &&= ASTERISK_FRAME_STATES[failed_reason.to_i]
        define_singleton_accessor_with_pair(:failed_reason, failed_reason, environment)
      end
    end