code: def get(self, sid):
          
          return AssignedAddOnExtensionContext(
              self._version,
              account_sid=self._solution['account_sid'],
              resource_sid=self._solution['resource_sid'],
              assigned_add_on_sid=self._solution['assigned_add_on_sid'],
              sid=sid,
          )
docs: Constructs a AssignedAddOnExtensionContext
  
          :param sid: The unique string that identifies the resource
  
          :returns: twilio.rest.api.v2010.account.incoming_phone_number.assigned_add_on.assigned_add_on_extension.AssignedAddOnExtensionContext
          :rtype: twilio.rest.api.v2010.account.incoming_phone_number.assigned_add_on.assigned_add_on_extension.AssignedAddOnExtensionContext