code: def _proxy(self):
          
          if self._context is None:
              self._context = MemberContext(
                  self._version,
                  account_sid=self._solution['account_sid'],
                  queue_sid=self._solution['queue_sid'],
                  call_sid=self._solution['call_sid'],
              )
          return self._context
docs: Generate an instance context for the instance, the context is capable of
          performing various actions.  All instance actions are proxied to the context
  
          :returns: MemberContext for this MemberInstance
          :rtype: twilio.rest.api.v2010.account.queue.member.MemberContext