Explain the call flow of the mobile initiating call and the mobile terminating call in GSM
The call that the mobile station sends to other users through the base station is called the call or MO call that the mobile station sends. The call initiated from the base station and terminated on the mobile user is called mobile termination call or MT call.
Suppose that mobile user A calls mobile user B through the base station, then the call from A to the base station is called a MO call, and the call from the base station to B is called a MT call.
There are two main call categories in GSM, namely CS call (circuit switched call) and PS call (packet switched call). All call flow messages between the base station and mobile users for MO/MT CS calls and MO/MT PS calls will be interfered by gsm jammer.