Service Switching Point

Why Trust Techopedia

What Does Service Switching Point Mean?

A service switching point (SSP) is an end-point used by a telecommunications system such as telephone switches and performs call processing on calls that start, tandem or end at that site. SSPs can be connected to one another using Signaling System No.7 (SS7) links. SSPs may produce or receive SS7 messages for transferring call-related information. They may also send queries to service control points (SCPs) in order to discover the methods for processing a service request or call.


Techopedia Explains Service Switching Point

When a call is made, SSPs react by sending an inquiry to a central database known as a service control point (SCP) to ensure that the call is handled. The SSPs apply SS7 protocols that handle call setup, call handling and call termination with other SSPs. With the introduction of intelligent network architecture, the service part has been ripped away from the telephone exchanges and moved to other computer nodes. In this new structure, the telephone exchange is called the SSP, whereas the node that includes the services that controls call progress is known as the SCP.

The majority of the SSP functions are executed by linking a computer to the pre-existing switches. Through the voice switch, the computer gets signals for activating the communication of unique SS7 messages. The SSPs can be used for functions like enhanced routing services, virtual private networks (VPNs), number portability, call screening, personal number service, tele-voting and Internet call management.

The advantages of SSPs include:

  • Highly efficient switching in both conventional Time Division Multiplexing (TDM) as well as next-generation networks
  • Packing density that’s combined with a base of ready-to-employ applications
  • Support for a blend of VOIP and TDM interfaces that function as a link between packet-based domains and TDM. This provides a straightforward changeover between traditional and next-generation networks.
  • A blend of intelligent network services and call-handling features, which contributes to the productive use of network resources.

Related Terms

Margaret Rouse
Technology Expert
Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.