parameters defined is substantial (depending on equipment specifications, etc.), some commonly used parameters are noted below. Configuration of Exchange Terminals Parameters in this regard include the definition of ports for termination of the PCMs, and those related to synchronisation for the core network elements. Limitations of the equipments and naming conventions should be respected when giving the numbers for it. A synchronisation hierarchy should be clearly defined. 3G CORE NETWORK PLANNING AND OPTIMISATION Routing Parameters Routing parameters give the direction of traffic from the switch. Other parameters are related to outgoing calls for their signalling registration, control parameters, and the starting point for a call. Destination and Sub-destination Parameters Parameters related to the call's destination, and the route it takes, are required. The call may be routed through one or more sub-destinations which need to be defined in the naming conventions. Also, the parameters related to load sharing have to be clearly defined. Based on these parameters, the call will take the shortest route to reach the desired destination. The parameters generally include the name destinations (sub-destinations), route identifiers, types of calls, etc. Circuit Group Parameters Circuit group names, types and identifiers should be defined in the parameter lists. Also, parameters associated with the functioning of the circuit groups such as the signalling registers, SPCs, control, destination, etc., are defined. Call Parameters Parameters related to calls need to be defined. These include: network-related parameters such as country code (e.g. 34 for Spain), and codes required for making national and international calls definitions of IMSI (such as indicators, range) and associated public land mobile network (PLMN) call identity parameters such as calling and called party status (e.g. called subscriber is roaming or in conversation mode, etc.) network- and switch-related parameters like mobile country code and the mobile