What are the meanings of different status messages found in web SMS (sms.rancelab.com)?

In web SMS (sms.rancelab.com) we can find different types of status messages for delivery of SMS

Please find the meanings of those messages as mentioned below,

Srl	Status Message	Meaning
1	SUBSMSC	Subject to Mobile Switching Center Update
2	NDNC_FA	National Do Not Call
3	DELIVRD	Delivered
4	EXPIRED	Expired
5	EXP-MEM	Memory Box Full
6	EXP-NW	Network Error
7	EXP-ABS	Absent Subscriber
8	EXP-SMS	SMS Expired
9	FAILED	FAILED
10	UNDLVRD	Undelivered