NIMNetCallNotificationContent 成员列表

成员的完整列表，这些成员属于 NIMNetCallNotificationContent,包括所有继承而来的类成员

	callID	NIMNetCallNotificationContent
	callType	NIMNetCallNotificationContent
	duration	NIMNetCallNotificationContent
	eventType	NIMNetCallNotificationContent
	extendMessage	NIMNetCallNotificationContent
	from	NIMNetCallNotificationContent
	members	NIMNetCallNotificationContent
-	notificationType	NIMNotificationContent
	timetag	NIMNetCallNotificationContent