Introduction - If you have any usage issues, please Google them yourself
GSM/GPRS/EDGE Access Stratum (GAS). The protocol stack is based on a dual mode stack (2G and 3G) which easily can be configure single or dual mode during compile time, without any additional code overhead.
The Non-Access Stratum (NAS) contains the non-access specific 3GPP protocols, i.e. protocols that are not