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Signal Transfer PointSignal Transfer Point

The SVI_STP is a feature rich and future proof carrier grade telecommunications Signal Transfer Point that provides core network connectivity and routing between multiple networks supporting legacy SS7 TDM, NGN IP SIGTRAN and IMS / LTE / 4G support.

STP Features and Functionality

The SVI_STP is a feature rich product honed from a decade of deployments.


At the heart of the Signal Transfer Point lies a core set of features including web based OA&M, powerful routing, message manipulation and screening, performance monitoring, detailed debug and trace and carrier grade redundancy.

Flexible licensing provides the choice of Legacy SS7, Next Generation SIGTRAN or 4G/IMS/LTE network support.

Legacy SS7 Networks

Legacy SS7 networks diagram

Deploying an SS7 STP into legacy networks immediately provides cost savings with centralised control, routing and monitoring capabilities:

  • Support for E1/T1/J1 OC-3/STM-1/ DS3 interfaces
  • Scales to 1024 SS7 signalling links
  • A-F link support
  • Seamless inter-op of 40+ SS7 variants inc ETSI to ANSI
  • HSL (High Speed Links – HDLC) support
  • Carrier Grade 1+1 and Mated Pair Redundancy Support

Next Generation SIGTRAN Networks

Deploying a SIGTRAN Signal Transfer Point delivers the immediate flexibility and cost savings available over an all IP SIGTRAN network

Next generation IP networks diagram

  • Support for transition to an all IP network
  • Any-to-any TDM to IP inter-working
  • SS7 linksets can be a combination of SS7 TDM and IP links for maximum flexibility
  • Offload traffic onto cost-efficient IP telecoms networks conserving bandwidth on expensive TDM networks
  • Full support for IETF’s SIGTRAN standards M2UA, M2PA, M3UA, SUA

4G/LTE/IMS Networks

The SVI-STP delivers seamless IMS/4G/LTE interworking via integrated Interworking Function

Diameter Interworking Function diagram

  • The InterWorking Function is delivered as part of Squire Techs carrier grade Diameter Signalling Controller SVI-DSC
  • Fully 3GPP compliant
  • Powerful message manipulation and configuration capabilities
  • Solves interoperability issues and enhances ROI, by protecting investments and enabling new service opportunities

Operation, Administration and Maintenance (OA&M)

Web based GUI

Web Based GUI

The globally deployed SVI platform empowers its users with an advanced level of expertise and functionality.

Building upon the SVI command line interface the web based GUI brings the user powerful tools to manage system resources, ensuring swift new user adoption and delivering a real-time OA&M, offering:

  • Dashboard interface
  • Wizard library
  • Customisation - via XML
  • Secure multi-user features
  • Extensive help resources
  • Compatibility with the entire SVI range


Real time system setup, onboard resource and call routing management


Comprehensive statistical service monitoring and system status tool


Rapid tracing, diagnosing and CDR analysis compatible with Wireshark and Ethereal

Command line interface

Command Line Interface

Expert user tools accessed through wide vocabulary of command line queries via high speed MMI interface.


  • High speed real time configuration
  • Full ‘secure’ remote access


  • Low Level MMI Interface
  • Full onboard database inspection and control
  • Real time resource status display
  • Controlling system recourses


  • Configurable logfiles, capturing all aspects of system performance
  • Compatible with Wireshark and Ethereal for full graphical protocol traces


  • Extensive onboard CDRs and statistics generation
  • Call minutes, ASR, PDD, ACD, etc
  • Resource Statistics
  • Trap Reports Network

Network Monitoring

  • Trap capture
  • Statistic monitoring, graphing and alarming


1+1 Redundancy

Proprietary data + signalling checkpointing between planes

Mated Pair Redundancy

Standard SS7 Mated Pair redundancy

1+1 Redundancy diagram
  • Five Nines up time (99.999)
  • Single Point code spread across dual plane architecture
  • Single IP service address using VIP technology
  • Real Time Maintenance Upgrades
  • Replicated Hardware and Software
  • Maintain calls in answer on failover
  • Eliminates Single Points Of Failure

Combined 1+1 and Mated Pair Redundancy

1+1 Redundancy diagram

Intelligent Routing

Powerful Regular Expression based routing, screening and message manipulation at MTPL3, SCCP and MAP

MTP routing diagram

MTP Routing

  • Route on MTP label
  • Originating and Destination Pointcode
  • Network Indicator
  • SIO

MAP Routing

  • MAP Routing
  • Routing on MAP OP code
  • Manipulation of MAP IE contents


  • ITUT Q711-Q714
  • JT-Q711-G714
  • ETSI ETS 300 589
  • ANSI T1.112

SCCP Routing

  • Routing on incoming SCCP label
  • Called and Calling
  • GT, PC, SSN
  • NOA, etc
  • Variant Translation Outgoing SCCP label manipulation
  • Translate routing variant
  • (GT > PC+SN, etc)

Gateway Screening

Provides telecommunications operators the ability to examine all incoming and outgoing messages against pre-defined rules. The end result is that either a message is routed or discarded. Gateway Screening is performed on the following MSU parameters.

MTP3 Screening

  • Service indicator
  • Affected PC in management messages
  • Origination point code
  • Destination point code

SCCP screening – Called Party

  • Encoding scheme
  • Global title indicator
  • Nature of address indicator
  • Numbering plan
  • Point code
  • Subsystem number
  • Translation type

SCCP management screening

  • Affected point code
  • Affected subsystem number

Calling Party

  • Encoding scheme
  • Global title indicator
  • Nature of address indicator
  • Numbering plan
  • Point code
  • Subsystem number
  • Translation type


  • ISUP message type

MAP Screening

  • OP Code

General Screening

  • Byte-pattern and offset

Flexible MSU Record Capture

Flexible MSU record diagram

The SVI-STP provides a flexible mechanism for the capture of all MSU messaging storing as :-

  • ASCII based MSU records configurable
  • ASCII based CDRs
  • Store MSU details in SQL database

Allows operators to perform Billing Reconciliation, Network Analysis etc