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An SSP can be a combination voice switch and SS7 switch, or an adjunct computer connected to the local exchange's voice switch. An SS7 message must be sent to this adjacent exchange requesting a circuit connection on the specified trunk. The SSP function is to use the information provided by the calling party such as dialed digits and determine how to connect the call. The database is an application entity which is accessed via the TCAP protocol. STPs are paired to ensure redundancy There are three levels of STPs. International STP functions within an international network. It accepts a query for information from a subsystem at another node. SSPs convert a dialed number from a subscriber line to SS7 signaling messages. It is an interface to application-specific databases. Signal Transfer Point STP STPs are packet switches, and act like routers in the SS7 network. Gateway STPs serve as the interface into another network and they can provide protocol conversion. SCP is used by STP to perform a function called global title translation Posted by.{/INSERTKEYS}{/PARAGRAPH} It does not offer termination services. STPs also provide traffic and usage measurements. Routes each incoming message to an outgoing signaling link, based on routing information contained in the SS7 messages and a pre-defined route table. SSPs setup, manage and release voice circuits required to make a call. {PARAGRAPH}{INSERTKEYS}Service Switching Point SSP The Service Switching Point SSP is the local exchange in the telephone network. The SSP provides the functionality of communicating with the voice switch via the use of primitives and creating the packets, or signal units, needed for transmission in the SS7 network. Messages are not originated by an STP.. The ability to send messages using the ISDN User Part ISUP protocol and the Transaction Capabilities Application Part TCAP protocol is the only requirement, other than the network management. There are very few features required of an SSP. A routing table will identify which trunk circuit to use to connect the call, and which exchange this trunk terminates at. Gateway STP converts signaling data from one protocol to another. Summary: SSPs are switches in SS7 network.