Hashem,
Here’s the definition of T3168 timer:Wait for Packet Uplink Assignment message
The timer T3168 is used on the mobile station side to define when to stop waiting for a Packet Uplink Assignment message after sending of a Packet Resource request message.
The timer value is modifiable.The unit is 500ms (0=500ms, 1=1s, 2=1.5s, etc.)- Minimum value is 1 and Maximum value is 7. However, you’d need to wait for 5 minutes for the changes to take place. Also, you need to disable GPRS and Re-enable GPRS for those cells where GPRS is enabled for the changes to take effect.
Hope this helps.