Signal Transfer Point

Signal Transfer Point

The current status of today’s telecommunications signaling network can be described by two important characteristics: the maturity of the Signaling System 7 (SS7) Network and the evolution from SS7 signaling to Diameter signaling, each providing benefits and challenges. The Sonus DSC 8000 addresses these challenges by providing cost effective solutions to the legacy SS7 network and an evolutionary path to the Next Generation LTE/EPC Diameter network.

The IP-Centric design of the Sonus product portfolio facilitates its integration into service provider networks worldwide without the use of external IP switching equipment. The incorporation of internal Ethernet switches provides a high capacity IP backplane and is also the basis for the most efficient, network friendly SIGTRAN implementation available.

Sonus DSC's allow a service provider to “take control” of and maintain the viability of their SS7 signaling network while evolving to the next generation LTE/EPC/Diameter network based on the following:

Flexible Interfaces

The Sonus Signal Transfer Protocols (STP) vast array of network interfaces provide network planners the ability to design and implement SS7 network architectures that meet both the physical and business requirements of their companies. These interfaces include Time Division Multiplexing (TDM) SS7 Links, Asynchronous Transfer Mode (ATM) SS7 links, High Speed “HSL” Annex “A” SS7 Links and the IP-based SIGTRAN Links.


The architecture of the Sonus STP allows it to be cost effectively deployed in SS7 Networks of any size. The incremental scaling concept of the Sonus STP provides growth to 4536 SS7 Links or 3000 SIGTRAN associations in a single system.

Network Protection

The Sonus STP acts as the gateway to a signaling network, managing and controlling all traffic, securing and protecting the operator’s network from unauthorized access thereby preventing denial of service or malicious network attacks.

Advanced Services Offerings

The Sonus STP has expanded the functionality of SS7 Global Title Translation and Gateway Screening delivering the flexibility to steer messages across specific paths by utilizing multiple origination and destination parameters during the routing decision process. Sonus STP’s "open systems approach" provides carriers the ability to copy or redirect received messages to external or internal value added, revenue generating applications based upon a comprehensive set of screening parameters.

The Sonus STP is also integrated with PSX providing Local Number Portability (LSP). This integrated signaling and policy control solution enables operators to invest in legacy networks that can be leveraged for next-gen ENUM solutions.

Figure 1: Migration from SS7 to Diameter

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