Multi-Tech Systems MMCModem GPRS (MTMMC-G) - Manual (Page 62)

Chapter 9 – Short Messages Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 62
Example of New Message Acknowledgement in PDU Mode:
Command Possible responses
AT+CSMS=1
Note: SMS AT Commands compatible with
GSM 07.05 Phase 2 + version OK
AT+CMGF=0
Note: Set PDU mode OK
Note: PDU mode valid
AT+CNMI=2,2,0,0,0
Note: =2 OK
+CMT: ,29
07913366003000F1240B913366920547F30000003003419404800
B506215D42ECFE7E17319
Note: message received
AT+CNMA=2,2
>00D3
Note: Negative ACK to the SMS.
Reason is: memory capacity exceeded OK
AT+CNMA=2,2
>00D3
Note: Negative ACK to the SMS.
Reason is: SIM memory storage is full OK
AT+CNMA=2,2
>00D3
Note: Negative ACK to the SMS.
Reason is: Error in modem OK
AT+CNMA=2,2
>00FF
Note: Negative ACK to the SMS.
Unspecified error OK