Multi-Tech Systems GPRS (MTSMC-G) ユーザーズマニュアル

Chapter 15 – GPRS Commands  

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 

167 

 

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

Command syntax:   AT+CR 

AT+CR=0 
Note: Extended reports disabled 

OK 
Note: Command valid 

AT+CR=1 
Note: Extended reports enabled 

OK 
Note: Command valid 

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 

Command Syntax: AT+CEER 

ATD123456789 ; 
Note: Outgoing voice call 

NO CARRIER 
Note: Call setup failure  

AT+CEER 
 
Note: Ask for reason of release 

+CEER: Error <xxx> 
OK 
Note: <xxx>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.