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What does the UCP-EMI message status mean?

UCP-EMI message states and their meanings are listed here for your convenience:

Message State Description
0 Delivered
1 Buffered
2 Not delivered

Message states 1 and 2 may be accompanied by a 'Rsn' (reason) code to give more information about the status of the message.

Reason codes
Code Meaning
000 Unknown subscriber
001 Service temporarily not available
002 Service temporarily not available
003 Service temporarily not available
004 Service temporarily not available
005 Service temporarily not available
006 Service temporarily not available
007 Service temporarily not available
008 Service temporarily not available
009 Illegal error code
010 Network time-out
100 Facility not supported
101 Unknown subscriber
102 Facility not provided
103 Call barred
104 Operation barred
105 SC congestion
106 Facility not supported
107 Absent subscriber
108 Delivery fail
109 SC congestion
110 Protocol error
111 MS not equipped
112 Unknown SC
113 SC congestion
114 Illegal MS
115 MS not a subscriber
116 Error in MS
117 SMS lower layer not provisioned
118 System fail
119 PLMN system failure
120 HLR system failure
121 VLR system failure
122 Previous VLR system failure
123 Controlling MSC system failure
124 VMSC system failure
125 EIR system failure
126 System failure
127 Unexpected data value
200 Error in address service centre
201 Invalid absolute Validity Period
202 Short message exceeds maximum
203 Unable to Unpack GSM message
204 Unable to convert to IRA ALPHABET
205 Invalid validity period format
206 Invalid destination address
207 Duplicate message submit
208 Invalid message type indicator

For more information on these codes please consult the UCP-EMI specification available here.