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A Comprehensive Future-Proof Signalling Transfer Point

The SVI-STP is a feature-rich, future-proof carrier-grade Signal Transfer Point providing core network connectivity and routing between multiple networks.
The SVI-STP has full support for SS7 TDM, NGN IP SIGTRAN and IMS / LTE / 4G, with interworking between 3G, 4G and 5G networks.

Future Ready STP

The SVI-STP is a mature and proven carrier-grade Signalling Transfer Point (STP) deployed in operator networks worldwide. It provides full support for SS7 networks, and next-generation SIGTRAN whilst offering future-proof integration with tomorrow’s DIAMETER-based networks.

“The SVI-STP offers a scalable architecture with flexible pricing designed to meet budget expectations, deployment scale and future growth. Couple this with 365x24x7 support, decades of commissioning experience and a solid product road map the SVI-STP insures your core network needs are met today as well into the future.”

Flexible Pricing Designed to Meet Budget Expectations, Deployment Scale and Future Growth

  • Global Deployment
    The SVI-STP has been deployed globally in over 150 networks.

  • Multi-Region Support
    Comprehensive support for 40+ SS7 country variants and ANSI to ETSI translation.

  • Number Portability
    Integrated Signalling Relay Function (SRF) for MNP/LNP support (ETSI EN301 716).

  • Fraud and Security
    Firewall capabilities and integrated fraud prevention gateway.

  • Future Proof
    Fully integrated with the SVI-DSC Diameter Signalling Controller.

  • Migration Enablement
    In-house expertise enabling rapid migration from End-Of-Life STP platforms. 

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Complex Routing

TCAP / MAP App Code + IE’s.

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1000 to 100K MSU’s 8 to 1024
Signalling Links.

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Gateway Screening

MTP, SCCP, Called/Calling Party
Enables first-line firewall capability.

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1+1 Redundancy Mated Pair
1+1 & Mated Pair.

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Real-Time Fraud Prevention

Enable our integrated MavenShield product
to combat fraud in real time.

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Configuration, Monitoring
and Debugging.

Commercial Off The Shelf

Supplied on standard Dell servers optionally with dedicated E1/T1/STM-1 support.

Virtual Deployment

Virtual Machine deployed on industry-standard servers in a data centre environment using a hypervisor, i.e. VMware.

Cloud Deployment

Delivered as a Virtual Network Function (VNF) in AWS, OpenStack, Nokia and Google cloud infrastructure.

A Perfect End-of-Life Alternative

For operators facing the prospect of End-of-Life STP/ITP products, the SVI-STP is perfectly placed as a direct and seamless replacement. With a wealth of experience in replacing end-of-life products, we offer operators a refined process of seamless migrations focussed on minimal disruption, future-proofing and zero loss of services.

“Our migration process takes the strain presented by end-of-life for key network infrastructure, providing fully supported replacement alternatives and a committed long-term roadmap to ensure future-proofing of your networks.”

The SVI-STP Signal Transfer Point Supports

  • SS7 Networks

    • Full support for Fixed and
      Broadband networks.

    • Support for E1/T1/J1 OC-3/STM-1/ DS3 interfaces.

    • Scales to x1024 SS7 signalling links.

    • A-F link support for Low-Speed Links and High-Speed Links.

    • Carrier Grade 1+1 and Mated Pair Redundancy Support
  • Next-Gen IP Networks

    • Full support for Mobile 2G and 3G networks

    • Full support for IETF’s SIGTRAN standards M2UA, M2PA, M3UA, and SUA.

    • SS7 link sets can be a combination of SS7 TDM and IP links for maximum flexibility.

    • Offload traffic onto cost-efficient IP networks conserving bandwidth on expensive TDM networks.
  • IWF over 4G Lte and 5G

    • Full support for VoLTE, IMS, 4G Lte and 5G networks.

    • SS7 to 4G / LTE / IMS network interworking.

    • 3G to 4G roaming.

    • Interconnect with Diameter network components and platforms.

    • Deliver any combination of routing, inter-working and network edge functionality.

End-of-life Whitepaper

For more information about our migration process download our End-of-life whitepaper below.

End-of-life Whitepaper graphic

Real-Time Fraud Prevention

The annual loss globally to the Telecoms industry from fraud is currently estimated by the CFCA (Communications Fraud Control Association) to be $29.2 billion.

Enable the real-time fraud prevention gateway, MavenShield, to:

  • Combat SS7 fraud in real-time
  • Proactively block, tear down, transfer and redirect fraudulent calls
  • Seamless interface to upstream firewall and monitoring applications
  • Deployed in the non-critical path of the network
  • Rapidly provision network lookups aimed at identifying fraudulent traffic


MavenShield Logo Header

Signalling Firewall

In “reverse” the IM-SSF allows legacy subscribers to access the new services available in an IMS network. It is the glue that allows legacy subscribers to access new services run from SIP application servers – i.e Mobile PBX, OTT etc.

Signalling Firewall graphic

Network Monitoring Probe

Prism is a Telecom network monitoring probe that passively monitors your network and produces in near real-time, CDRs from the low-level signalling protocols traffic.

Supports 3G, 4G, 5G, fixed and mobile networks

  • Real-time generation of call, session and transaction records
  • Higher bandwidth hardware accelerated probes of up to 100GB available
  • Passive monitoring of your network signalling traffic
  • Advanced packet inspection and protocol discovery
  • Comprehensive rules-based system to identify traffic for revenue assurance and fraud detection
  • Seamless integration with Big Data, BSS and Business Intelligence platforms
  • CSV, SQL, RESTful API integration to 3rd party applications


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SRF | Signalling Relay Function

Integrated Signalling Relay Function:

Seamlessly enables Mobile Number Portability

Manage the interface between GMSCs + HLRs
– SCCP Call Steering
– Call Control Triggering

Integrates over a range of APIs

Support for 3GPP TS 23.066

SRF Signalling Relay Function Diagram

IM-SSF | IP Multimedia Service Switching Function

The SVI-STP supports the 3GPP IMS component the IM-Service Switch Function (IM-SSF) 3GPP 23.278 providing a seamless bridge between an IMS network (SIP) and a CAMEL-based SS7 Intelligent Network via Squire Technologies integrated SVI-TAS Telephony Application Server.

When an operator initially deploys an IMS network they are unlikely to be able to enable all the revenue services available to their existing legacy subscribers. To insure continuity of service the IMS network can leverage the existing Intelligent Network through the IM-SSF component.

IM-SSF Diagram 3

Reverse IM-SSF

In “reverse” the IM-SSF allows legacy subscribers to access the new services available in an IMS network. It is the glue that allows legacy subscribers to access new services run from SIP application servers – i.e Mobile PBX, OTT etc.

Reverse IM-SSF Diagram 2

USSD Gateway

Unstructured Supplementary Services Data (USSD) is a session-based protocol used in 2G/3G networks to send text between a mobile phone and an application program in the network. Unlike SMS there is no store and forward as USSD transactions only exist for the length of a session. USSD applications are generally menu driven and can push text in a menu format to subscriber handsets.


  • Pre-Paid Roaming – USSD used in the network to check in real-time
    subscriber has enough credit for a call
  • Pre-paid subscribers – use USSD to manage and top-up their accounts
  • Mobile Money – subscribers able to make payments and purchases
    via their phones menu driven USSD interface

Example Case Study

Working with a 4G mobile operator rolling out roaming services they needed to insure that pre-paid subscriber’s credit checks operate correctly in 3G networks.

USSD Diagram 2

Some 3G networks perform credit checks via USSD. The SVI-TAS integrated with a DIAMETER SVI-IWF product is deployed in the client’s 4G network to deliver the required USSD to DIAMETER messaging interoperability. In a subsequent phase of the project, the client decided to provide their subscribers with a full USSD-driven menu application. This was interfaced and configured using the SVI-TAS to provide the HTTP interface to their OCS platform. This flexibility and ease of deployment allow our clients to rapidly evolve and extend functionality according to their requirements.

HLR Lookup RESTful API

In “reverse” the IM-SSF allows legacy subscribers to access the new services available in an IMS network. It is the glue that allows legacy subscribers to access new services run from SIP application servers – i.e Mobile PBX, OTT etc.

HLR Lookup RESTful API

Equipment Identity Register (EIR)

In “reverse” the IM-SSF allows legacy subscribers to access the new services available in an IMS network. It is the glue that allows legacy subscribers to access new services run from SIP application servers – i.e Mobile PBX, OTT etc.

Equipment Identity Register EIR

Trusted by Customers Worldwide

Squire Technologies solutions enable over 30 billion transactions per second and 11 trillion transactions per year. We have deployments in over 6 continents, in 150+ countries and with 400+ customers. 


Transactions per second


Transactions per year


Telecom Operators



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Check out what our customers are saying about us here at Squire Technologies.

Further Information

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Product Solutions for

Find out about our MVNO & MVNE Product Solutions and Services

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Signal Transfer Point Presentation

Download our SVI-STP Signal Transfer Point Presentation


Diameter Signalling

Find out more about our SVI-DSC
Diameter Signalling Controller