Mobile Service Switching Center have important functions in switching communication in the entire MS in the MSC area. Such as setting up, routing, supervising calls to and from MS.

MSC-Mobile Service Switching Center functions:

- Establish a connection and traffic signaling.

- Billing: Recording of the duration of speech.

- Pagging: The process of giving signals to the BTS, which has the frequency with the same frequency signal MSC issued with the purpose to find the Subscriber calling.

- Handover: This process can also occur in the MSC. The process of handover to the MSC called the inter handover MSC.

- Access to the data base to PLMN (VLR, HLR, EIR).

- Implement security functions.

Data Transmision MSC contains Interface (DTI), which is implemented on a GSM interworking function (IWF). DTI to handle data functions such as data conversion rate.

MSC / VLR implemented on AXE as follows:

• MSS (Mobile Switching Subsystem) handle and to set up the call, charging implemented for supporting function and the gateway GMSC on roaming.

• MMS (Mobile Mobility and Radio Subsystem) handle up date location, authentication and chippering access to all the radio. handle requests handover and paging. Save information about the cell and torture.

• MMS creation (Mobile Data Subsystem) Save the data received by the HLR.

• SHA (Short Message Service Subsystem) Contains the Short Message Service (SMS).