Steering of Roaming

Steering of Roaming is an essential part of a comprehensive roaming strategy. The combination of an extensive rules engine with advanced reporting and analytics capabilities allows you to hit more targets on the basis of traffic, without compromising subscriber quality of service. Set your network apart and gain the loyalty of your subscribers.

  • Improve subscriber experience with precision control over outbound roamers
  • Maximise profits from wholesale roaming agreements
  • Strike better deals thanks to accurate analytics
  • Use the multi-tenancy feature to configure and control multiple remote platforms across your group.


Detect and steer to 5G NSA networks for higher quality

When a network makes a 5G roaming agreement with a partner MNO, they want their subscribers using 5G for providing the best quality of service. It is possible in 5G NSA to favour networks only if 5G NSA is available. From an analytics perspective, it is also useful to develop a view of which networks are capable of offering 5G NSA, and how widespread it is within that network. The Steering of Roaming system can provide these benefits to ensure the benefits of 5G NSA roaming can be maximised.

Standalone is based on HTTP/2 protocol and is defined as part of the 5G core

  • Smooth and consistent steering 

It is essential that 5G signalling is processed consistently with the existing SS7 and Diameter traffic to ensure consistency of steering for a subscriber. SS7, Diameter and 5G components are closely integrated, to ensure subscriber is routed to only one network type on one network .

  • Maintain control over 5G subscribers to steer 5G subscribers without losing visibility and control of that traffic. Without 5G SoR, no trigger for steering. 

In traditional SIM based steering, the preferred PLMN list is delivered over an independent channel (eg. SMS). There can be failures in delivering this SMS for numerous reasons, rendering the steering ineffective. With this new coupling of the PLMN list with the signalling registration, we can expect 100% success of delivery to the SIM card.

Every Network

Fully integrated across access technologies 2G, 3G, 4G, and 5G NSA Steering of Roaming is able to support roamers on SS7 and LTE/EPC Diameter networks. Rules are developed independently of the underlying protocol thus reducing the complex changes required to support roamers on different technologies. 

Users can develop and enforce policies to meet any operator or subscriber group requirements. 

Set broad policies or achieve fine-grained control of services available to roaming subscribers such as voice or data.

Uses REST API Integration


The intuitive GUI allows administrators to easily configure white and black lists and customise rules for different segments.

Equipped with powerful (yet agile) reporting and alerting features, you can be sure to have the most accurate information about your network traffic at your fingertips.

Everyone on your team can be provided proper access levels and customise reports to suit their individual needs (no matter their level of technical expertise) thanks to the intuitive GUI. 

Easily set alerts or publish reports as broad as outbound traffic or drill down to troubleshoot VIP roaming complaints with the touch of a button.

VoLTE Steering

Clear visibility of VoLTE subscribers, networks, and quality of service allow you to steer VoLTE users to the highest quality networks. 

  • Identify VoLTE capable subscribers and networks
  • Visibility and reporting on IMS registration success and deregistrations
  • Ensure availability and quality of service for roamers 
  • Automatically steer to better or best network for VoLTE
  • Verify success of VoLTE connection in networks without circuit-switched calling


Powerful analytics give you real-time visibility of all roaming conditions and activity.

The latest Big Data technologies are used for near-real time analytics in tracking patterns of usage and behaviours of subscribers, which means reliable data sources for segmentation. 

Guaranteed optimal Update Location (UL) ensures subscribers are routed to the optimum network with precision.

Advanced analytics allows you to see when outbound roamers are using data in real time. This can be used to make more informed steering decisions as well as classifying roamers into groups based on data usage.

Signalling Providers and Signalling Hubs

Signalling is your business — at least maintain control. We have provided many Tier 1 signalling hubs with the capability to control and secure their signalling.


Compliant with GSMA IR.73

GSMA’s Steering of Roaming Implementation Guidelines, IR.73 defines guidelines which provide cooperative requirements between networks when SoR is employed. It also provides technical requirements for minimal impact on the visited network’s SS7 and Diameter links. Version 1.0 was released June 2005, then Versions 2.0 and 3.0 in 2006, and Version 4.0 in October 2014.

Proof of Concept

What would you like to see?

See about a demo of Cellusys roaming products on your network