Please help : Unable to connect gprs

Please help : Unable to connect gprs SearchSearch
Author Message
Bensly Shanmugam
New member
Username: Bensly

Post Number: 2
Registered: 03-2007
Posted on Wednesday, March 28, 2007 - 02:52 pm:   

Hi,
i am using nokia 12i gsm modem to send sms and mms via gprs, sms and mms sending properly , but some time i am not able to connect gprs,i tried with hyper terminal to dial atdt*99# its returning message NO CARRIER immediately, after switch off and on the modem gprs working fine,how can i resolve this problem , please help me

Regards
Bensly
Bryce Norwood - NowSMS Support
Board Administrator
Username: Bryce

Post Number: 7048
Registered: 10-2002
Posted on Thursday, April 05, 2007 - 07:22 pm:   

Hi Bensly,

That is very strange.

My only thought is wondering if there might be some modem init command that we might be able to send to the modem to get it to recover.

If so, then you could either configure NowSMS to send this command each time it inits the modem (this would happen each time after a send MMS attempt, when NowSMS returns to SMS mode with the modem) ... or you could configure the Windows modem driver to send the extra init command (this would happen before each MMS send, before the modem dials for GPRS access).

The question is ... what init command might work?

Here's what I'd suggest ...

When you end up with the modem in this state ... don't turn the modem off.

Stop the NowSMS services, and then immediately restart them. Is everything ok after just restarting the NowSMS services ... or is there still a problem?

I'm going to assume there is still a problem ... so in that case, I'd like you to stop the NowSMS services, and connect to the modem with HyperTerminal.

Try issuing the following commands:

AT+CFUN=0

AT+CFUN=1

Do you receive an "OK" response to both commands?

Now exit HyperTerminal, and start the NowSMS services. Is everything now ok?

If it is, then we just need to automate sending those commands. Try it first, if it works, then I'll give some suggestions for automating those commands.

-bn