PDF of this tutorialThe network architecture of a WIN platform links signal switching points (SSP), signal transfer points (STP), and signal control points (SCP). The WIN platform rests upon the SS7, TCP/IP, and voice networks. Serving Mobile Services Switching Center (S_MSC): The S_MSC is the interface between the radio system and the public switched telephone network (PSTN). The S_MSC provides the transport and translation support for call origination from and termination to the subscriber.
Signal Transfer Point (STP): The STP is a SS7 network packet switch that routes SS7 messages to the proper destination.
Signaling Interface Unit (SIU): The SIU converts SS7 messages into TCP/IP. The SIUs are redundantly deployed to provide alternate paths for greater reliability.
ISUP Call Control Unit (ICC): The ICC is the gateway between the SIU and the SCP's intelligent peripheral. The ICC directs messages to the proper destination.
Remote Service Unit (RSU): The RSU is an intelligent peripheral co-located with the S_MSC. The RSU is an adjunct switch that controls the prepaid calls and processes integrated voice response (IVR) messages.
Market Server: The market server contains the subscriber database and serves as the call rating engine.
Figure 1: Network Architecture
