GPRS registration issue

10 thoughts on “GPRS registration issue

  1. Dear Sir,

    We are using GL868-DUAL (10.00.187) in GPRS data logger. Sometimes we have observed that module isn’t able to activate GPRS context with BSNL SIM. 

    we tested that SIM card with mobile, it works fine but when we insert the same SIM in the module, it is not registering with GPRS network.

    Kindly find attached the log for your ready reference.

    Let us know what is the issue.

    Thanks,

    Diwakar 

      1. Dear Sir,

        Pease refer below log.

        Serial port COM4 opened
        at
        OK
        at

        OK
        at+cmee=2

        OK
        at#cimi

        #CIMI: 404738107181598

        OK
        at+creg?

        +CREG: 0,1

        OK
        at+cgdcont=1,ip,bsnlnet

        OK
        at+cgreg?

        +CGREG: 0,2

        OK
        at#gprs=1

        +CME ERROR: activation failed
        at+csq
        +CSQ: 26,0

        OK
        at+ceer

        +CEER: Normal, unspecified

        OK
        at#ceer

        #CEER: 237

        OK
        at#ceernet

        #CEERNET: 111

        OK
        at+cgreg?

        +CGREG: 0,2

        OK

        at#sgact=1,1

        +CME ERROR: activation failed

        Let us know issue.

        Thanks,

        Diwakar

          1. Dear,

            from the log I see that you’re trying to activate a context while the module is not registrated to the GPRS network yet (+CGREG: 0,2). You have to wait for +CGREG: 0,1; than you can issue “at#gprs=1”.

  2. Dear Sir,

    Below test has been done.

    1. We lifted device more than hours, but the device is not able registering with GPRS. it is continuously responding either 0,0 or 0,2. 

    2. The same SIM is working fine with the mobile. 

    3. Another operator SIM (Airtel, Vodafone, Idea etc.) is working fine with the module.

    we are encountering the issue only when we are using BSNL SIM with Telit module. 

    Please let us know, what is the root causes. 

    Thanks,

    Diwakar 

    1. Dear,

      the SIM can register to GPRS Network with different access technologies. The module is limited to 2G networks but on a mobile the SIM could register using other access technologies. This could be the reason why it works on mobile.

      Could you please try to issue AT+CGATT? and AT+CGATT=1 to force GPRS Attach after GSM registration (+CREG: 0,1).

      Please, issue also “at#ceer” and “at#ceernet” as you done before.

      Best Regards.

      1. Dear Sir,

        Please find attached log.

        AT#CEER

        #CEER: 237

        OK
        AT#CEERNET

        #CEERNET: 111

        OK

        Thanks,

        Diwakar

          1. Yes it is correct, the guide suggest to insert IP and APN using quotation marks (1,”IP”,”bsnlnet”) however as it is written above is the same. To better understand this issue we should make some analysis with our tools, so, I suggest to send a mail directly to TS-EMEA@telit.com with regard to this thread.