STP ( Signaling Transfer Point)

STP (Signaling Transfer Point)

Hi,

There are different types of signaling points in SS7 Standards, like
Service Switching Point (SSP) - like MSC, Tandem Switch, etc.
Service Control Points (SCP) - like HLR, etc.
Signaling Transfer Point (STP).

These Signaling points provide access to the SS7 network, databases, & transfer messages to other signaling points.

STP :- It Ÿis a vital element in SS7 network serving as a Signaling hub for the transfer of digital data packets between network nodes.
  
It routes messages throughout the network using, call information & network addressing structured within SS7 data packets.

It serves as dynamic router, controlling traffic flow & access to variety of SS7 nodes & network.

Functions of STP :-

1. Receives the MSU's & direct them to appropriate destination.
2. Network Management.
3. (ANSI to ITU) or (ITU to ANSI) protocol conversion.
4. Global Title Translation (GTT).
5. Measurement of Data.
6. Gateway Function.
7. Gateway Screening (GWS)
8. Local Number Portability (LNP).

 Different Links used with STP :-

• A-Link - It provide STP/SSP or STP/SCP connectivity. Maximum of 16 links can be there in a link set or maximum of 32 links in combined set.

• B-Link - It connects one STP to other STP of same hierarchical level. Maximum of 8 links in quad configuration of link set.

• C-Link - Maximum of 16 links in a link set.
• D-Link - Maximumof 8 links in a link set.

 

• E Links - It connects a STP to other STP other then its Home STP & provides an alternate route for SS7 messages if congestion occurs at home STP.

•  F Links - It provides SSP to SSP connectivity. It provides only Call Setup/TearDown capability & it should be adjacent.
  

 Why STP ???

• It provides Centralized Network Management, facilitating the delivery of Intelligent Services throughout the network.
• Reduction in Signaling Terminal Hardware in SSPs / SCPs. (like MSC, IN, HLR, etc.)
• Central Database for GTT at STP, Minimizes Errors.
• Efficient Routing of Messages.
• Flexible SS7 Network Management.
• Fast Integeration of New Nodes in the network.
• Easy Migration to Next Generation Networks like VOIP, Soft Switch, etc.