SS7 is a worldwide broadcast communications standard that characterizes how to arrange components in an open exchanged phone organize Public Switched Telephone Network(PSTN) trade data over a computerized Signaling System. Hubs in an SS7 organize are called flagging focuses.
SS7 comprises an arrangement of saved or devoted channels known as flagging connections. There are three sorts of system focuses flagging focuses: Service Switching Points (SSPs), Signal Transfer Points (STPs), and Service Control Points (SCPs). SSPs start or end a call and impact on the SS7 coordinate with SCPs to decide how to highway a ring or set and deal with some exceptional element. Movement on the SS7 arrange is steered by parcel switches called STPs. SCPs and STPs are generally mated with the goal that the administration can proceed on the off chance that one system point fizzles.
SS7 utilizes out-of-band flagging, which implies that flagging (control) data goes on a different, devoted 56 or 64 Kbps station as opposed to inside an indistinguishable station from the phone call. Generally, the motioning for a phone call has utilized a similar voice circuit that the phone call went on (this is known as in-band flagging). Utilizing SS7, phone rings can be set all the more productively and unique administrations, for example, call sending and remote wandering administration are simpler to include and oversee.
SS7 is utilized for these and different administrations:
- Setting up and managing the connection for a call
- Tearing down the connection when the call is complete
- Managing call forwarding, calling party name and number display, three-way calling, and other Intelligent Network (IN) services
- Toll-free (1800 ) calls.
- Wireless as well as wireline call service including mobile telephone subscriber authentication, personal communication service (PCS), and roaming.