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Aservice control point (SCP) is a standard component of theIntelligent Network (IN) telephone system which is used to control the service.[1] Standard SCPs in the telecom industry today are deployed usingSS7,SIGTRAN orSIP technologies. The SCP queries theservice data point (SDP) which holds the actual database and directory. SCP, using the database from the SDP, identifies the geographical number to which the call is to be routed. This is the same mechanism that is used to route800 numbers.
SCP may also communicate with an intelligent peripheral (IP) to play voice messages, or prompt for information from the user, such as prepaid long distance using account codes. This is done by implementingtelephone feature codes like "#", which can be used to terminate the input for a user name or password or can be used forcall forwarding. These are realized usingIntelligent Network Application Part (INAP) that sits aboveTransaction Capabilities Application Part (TCAP) on the SS7 protocol stack. The TCAP is part of the top or 7th layer of the OSI layer breakdown.
SCPs are connected with eitherSSPs orSTPs. This is dependent upon the network architecture that the network service provider wants. The most common implementation uses STPs.
SCP and SDP split is becoming a common industry practice. This is known generally in the industry by split architecture. Reason is that operators want to decouple the dependency between the two functionality to facilitate upgrades and possibly rely on different vendors.
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