The SVI-IWF Interworking Function insures operators 4G Diameter networks can successfully interconnect to legacy 2G/3G networks, equipment and signalling standards.

Comprehensive Diameter Interconnect

4G network rollout is not uniform. The SVI-IWF Interworking Function enables an operator to seamlessly traverse the hybrid mix of 2G / 3G / 4G network components from multiple vendors, across multiple networks on multiple signalling standards. Without it operators would have to replace all their legacy networks while rolling out LTE.


  • Enables roaming between 4G and 3G networks

  • Relieve network congestion with 4G WiFi offload

  • Enhance and upgrade legacy networks

  • Full interworking with MAP, CAMEL, RADIUS & USSD signalling

  • Full interworking with OSS / BSS over SOAP, XML, SQL, JAIN, JSON etc

4G - 3G Roaming

Squire Technologies SVI-IWF Interworking Function enables mobile operators 4G DIAMETER networks to seamlessly inter-op with legacy networks enabling 4G <---> 3G Roaming capabilities.

WiFi Offload

The SVI-Interworking Function enables 4G WiFi or Mobile Data Offloading which allows for further relief of congested networks by way of utilising capacity from unlicensed WiFi spectrum.

Legacy Interconnect

The SVI-IWF insures that mobile operators can integrate existing legacy infrastructure with new DIAMETER based components like Online Charging Systems (OCS), allowing them to maximise value in their legacy networks.

The SVI Interworking Function can be deployed as a standalone item, or as part of Squire Technologies Diameter Signalling Controller the SVI-DSC.

Interworking and Extended Support

The SVI-IWF allows operators to integrate new leading edge OSS / BSS components to their next generation or legacy networks. The flexibility of the SVI-IWF insures operators can confidently extend and advance their operational and business layer services to insure they remain completive.


  • Management and Monitoring
    Comprehensive web based SVI-MS Management system delivering on-board configuration, monitoring and debugging facilities. Full SNMP v1, 2 and 3 supports.

  • High Availability
    Carrier grade reliability supplied through comprehensive range of high availabilty options.

  • Cloud & COTS Delivery
    NFV compliant allowing delivery on a range of cloud native platforms. Can be delivered on a range of COTS server platforms either remotley or shipped from base.

  • Performance
    Highly scalable. Real-time time expansion available thorugh software license upgrades.

  • COTS 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 or OpenStack cloud infrastructure.

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Read our latest whitepaper on solving the 4G LTE mobile roaming puzzle

Download our SVI-DSC Diameter Signalling Controller Presentation