SIM808 GPRS connection issue

[aleshmahajan]

Hello,

I am using SIM808 in a project for a while and have this set of AT commands in use:

AT
AT+CREG?
AT+CGATT?
AT+SAPBR=3,1,"Contype","GPRS"
AT+SAPBR=3,1,"APN","airtelgprs.com"
AT+SAPBR=1,1
AT+HTTPINIT

which worked fine until I started getting problem with AT+SAPBR=1,1 which replies with an OK but the netlight starts blinking (According to datasheet it represent GPRS data transmission in process).:-|
Tried:bang::

1. reset
2. upgrade the SIM808 firmware(with and without user memory erase)
3. Changed the module itself
4. verified with 3 different SIM cards(Airtel, Airtel, TATADOCOMO: networks in India)

Suggestion are welcomed. Thank You

 

[tarmogr]

Hello,

netlight starts blinking (According to datasheet it represent GPRS data transmission in process).:-|

Where in the manual does it say that?

This is normal and the LED is always blinking fast when GPRS is on(AT+SAPBR=1,..).