def __call__(self, sid):
return AlphaSenderContext(self._version, service_sid=self._solution['<STR_LIT>'], sid=sid, )<EOL>
Constructs a AlphaSenderContext

:param sid: The sid

:returns: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderContext
:rtype: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderContext