IP and core

     The IP work based on the RNC ,BSC and switch connected to routers by Ethernet links and from the other hand the switch connected to other governorate by leased line or microwave link they used the juniper routers in zain company and there is other types like cisco, Huawei ,…etc there is other governorate like samawa its juniper not connected to RNC or BSC and other governorate like kut not connected to RNC only BSC connected to the juniper .

     The core work based on multiple things like there is ,the MSC which is divided into two parts MSS for control and MGW for signaling , VAS value added service this one responsible for services of ring callback , CBS it is in charge of checking if the customer able to handle the payment of the call or not  when its yes the call continue else the call aborted , GCS is responsible for the line of the call will be shorter than without it ,and there is  HLR which is in charge of locating the mobile ,HLR and GCS there is three of each one of then two in Baghdad and one in basrah.