i will try to describe the problem basicly
- It disconnects from GPRS after some passive time.
- After some more time, we can not reach the modem by CALL (Even by mobile phone->Operator says the number you called can not be reached at the moment… ).
- But when we look our logs, it shows that AT+CREG? responses returns “1” for “stat” parameter which tells modem is still registered to GSM network. Even modem’s led is still blinking.
- After hard reset, modem connects to GPRS and we can now reach the modem by CALL.
I think modem loses the GSM registration but it can not detect it. This happens on some modems which are on the area so i can not get any traces. What can cause this problem?