Multi-Tech Systems MMCModem GPRS (MTMMC-G) - Manual (Page 167)

Chapter 15 – GPRS Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 167
Service Reporting Control +CR
Description: This command enables a more detailed service reporting for incoming or outgoing calls. Before sending
the CONNECT response to the application, the GSM modem will precisely define the type of data
connection being established.
These report types are:
+CR: ASYNC For asynchronous transparent
+CR: REL ASYNC For asynchronous non-transparent
+CR: GPRS For GPRS
Values:
No parameters
Syntax: Command syntax: AT+CR
Command Possible responses
AT+CR=0
Note: Extended reports disabled OK
Note: Command valid
AT+CR=1
Note: Extended reports enabled OK
Note: Command valid
Extended Error Report +CEER
Description: This command gives the reason of the call release when the last call setup (originating or answering)
failed. New indication for GPRS is the reason of the last unsuccessful PDP context activation and the
last GPRS detach or PDP context activation.
Values: No parameters
Syntax: Command Syntax: AT+CEER
Command Possible Responses
ATD123456789 ;
Note: Outgoing voice call NO CARRIER
Note: Call setup failure
AT+CEER
Note: Ask for reason of release +CEER: Error
OK
Note: is the cause information element values form GSM
recommandation 04.08 or specific Call accepted
“NO CARRIER” indicates that the AT+CEER information is available for a failure diagnostic.
See Failure Cause from GSM 04.08 Recommendation in Appendix A.