roaming Archives - Cellusys


Total Mobile Operators Revenue in 2020 is forecasted around
€ 1,275,000,000,000 (€ 1,275 billion).


Roaming Revenue stays flat at 45,000,000,000 (€ 45 billion) from changes like ‘Roam Like at Home’
source: Juniper Research: Mobile Roaming Operator Billed Revenues to Stay Flat at $51 Billion, As ‘Roam Like At Home’ Becomes Global

source: Mobile Roaming to Represent 8% of Operator Revenues by 2018


  • 4.2 billion IoT Connections
  • 5.1 billion Mobile Subscribers
  • 9.3 billion Mobile Connections


7 out of 10 Subscribers are Silent Roamers

Source: 68% of global roamers are silent


1% of Active Roamers generate up to 70% of roaming data traffic.




By Using The STEERING solution




750 LTE Networks Commercially Launched in 223 Countries.

with 13,700 LTE User Devices listed in the market, 4G is the dominated technology in use.





235 5G Networks Launched or Trialling in 93 Countries.

Only 64 models of 5G User Devices listed.

5G Operates on larger channels up to 100MHz

  • 20X Peak Data Rate
  • 10X Lower Latency
  • 3X Spectral Efficiency

All Leads to 10 Seconds for HD Movie, Leading to a BIG change in the behaviour of subscribers.




Customer Experience


Brand Image


Unlock the Revenue



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Whether this is your first-ever Mobile World Congress or you are a seasoned veteran, this week in Barcelona will show you all you need to know about Mobile and convince you that MWC is the world’s greatest industry event.

Promising to break all records with over 90,000 visitors, meet with Cellusys at Mobile World Congress 6C58 and find out about the latest Signalling Firewall System, the most Advanced Roam Management system and our bulletproof SMS Firewall.

See you in Barcelona.

LTE networks are growing at a fast rate, more than 200 networks in three years have been deployed.

IPX (IP Exchange) enables three key aspects for an operator:

  • A Seamless roaming experience

  • Achieving Scale

  • Increased Services

IPX is not just a network to interconnect operators, it is also a cloud based platform to add new services such as VoLTE and RCS (Rich Communication Suite).

Most high level managers in the Telcos agree on one thing when asked about the benefits that IPX brings to the business. They all need a higher quality of service standard and a well-defined network to carry different kinds of applications and services driven by the end users needs and expectations.

IPX connection refers to multiple layers of service, rather than just a voice connection, an IP connection or an SMS connection as an alone. IPX also means sufficient capacity for reaching a critical-mass in coverage.

The IPX world might be linked to the concept of a roaming hub, it is about a central point for many services. One could say that today it is not really clear to find anyone (provider) creating that ‘’critical-mass’’ where an operator can get the reach needed to satisfy their target coverage and at the same time, avoiding needing more than two IPX-to-IPX transit points. Once you start adding, getting three IPXs in the chain means you are missing the benefits of not having direct connectivity as it used to be in the bilateral scenario to meet the needs of the business ecosystem in which they operate.


GRX providers can upgrade to IPX platforms, but they will struggle to keep up with LTE data demand compared to facilities-based IPX service providers.

The Benefits most operators are waiting for

When surveyed, CTO’s from influential mobile operator groups have three main drivers to launch an RFP to retain an IPX: Privacy, Security & QoS.

Other factors to consider when selecting the right IPX provider are:

  • Skillsets for easy and fast deployment. How good are they at working with multiple customers and variety of different objectives such as, providing innovative communication services with better quality and features as well as providing differentiated services against OTTs’ VoIP services, reduced setup times, audio quality with the possibility of wider codecs, and the possibility of implementing voice with more services such as video or RCS.

  • Guarantees Interconnection with multiple operators

  • Achieves operational cost savings

  • Ability to offer and demand end-to-end SLAs depending on the place you occupy in the value chain

  • Flexibility in Diameter signalling routing options and guaranteed Diameter signalling interoperability


LTE Roaming

SS7 has been used for 20 years, so it is a significant challenge to move to a complete new protocol.

For operators to use the Diameter protocol it demands integrating their equipment at the interconnection level. However, LTE data roaming will be the main driver in the immediate future. Physical interconnects between roaming partners need to be re-forged from scratch, using a relatively new protocol.

Worldwide mobile data traffic set to increase 13-fold between 2012 and 2017, reaching 11.2 exabytes (11.2 billion gigabytes) per month. According to Cisco Systems’ Visual Networking Index, Telcos are under pressure to address data service delivery not only on their own networks, but beyond them via roaming services. Complicating the issue is the fact that most mobile operators have to support roaming for all-IP services while still supporting legacy voice, SMS and data services at home and abroad. The mobile industry’s default solution to the problem is the concept offered by the IPX which was spearheaded by the GSM Association that promotes common specifications for end-to-end IP traffic delivery and quality of service that gives operators a cost-effective way to manage LTE services across networks.

What are the rules now and in the immediate future?

The Diameter signalling protocol is used for coordination between IP network elements such policy servers, online charging systems and mobility gateways. Diameter plays a crucial role in mobility and as operators have migrated networks to LTE, added new services and implemented more sophisticated policy use cases, signalling volumes are skyrocketing.

Operators moved from the older RADIUS, MAP and CAMEL interfaces to the newer, more sophisticated Diameter signalling protocol. Examples of service plans for subscribers (such as new charging models) can be categorized as follows.

  • Tiered services

  • Shared data plans

  • Casual usage and loyalty programs

  • “Toll-free” or sponsored data usage

  • Mobile advertising

  • Quality enhanced over-the-top (OTT) applications and content

  • Cloud and machine-to-machine (M2M) services

Operators will need a robust Diameter network in place to manage signalling traffic increases resulting from more frequent and longer data sessions, video downloads and complex charging rules and policy.

Statistics to illustrate the LTE landscape:

  • LTE penetration, North America is leading with 56%, today is the largest LTE market.

  • JAPAC –Japan and Asian countries- 11% in second place. There’s a significant room for growth

  • By 2017 more than 10 billion devices will process more than 300 billion app downloads worldwide.

  • The notion of “busy hour” will evolve, volumes to be driven by subscriber behaviour rather than time, the devices they use and services apps they invoke will determine the traffic levels. Signaling traffic peaks and valleys will not occur at the same time of the day.

  • The pace of Diameter signalling growth will increase as operators evolve to all-IP networks. Even though Diameter is used in 3G networks as well as LTE, SS7 signaling is still heavily employed in 3G environments.

  • Signaling traffic is growing at twice the speed of mobile data.

  • WiFi roaming, once standards have been completed, WiFi roaming will begin to offset the 3G decline, (in low levels). Due to its high LTE penetration, North America will have the lowest per capita 3G – LTE roaming traffic of all regions.

  • Mobility is projected to reach 3.5 million MPS (messages per second) by 2017, a CARG of 84% in JAPAC. Developing countries continue to maintain their 3G networks while they roll out LTE in metropolitan areas. LTE will be adopted slowly due to subscriber buying behaviour still heavily favour feature phones.

In conclusion, if you are in the supplier side of the ecosystem, and you plan to keep your business in good shape exploiting the potential of mobility and satisfying your customer hunger for being connected, accessing content and information before each one of his daily activities take place on the move, then think twice, you need to upgrade your network before the tsunami of signalling traffic takes over.

Control Roaming Quality and Partner Network activities to increase revenues with the most comprehensive solution available on the market

Many Operators have growing numbers of roaming subscribers and need to protect and increase their roaming revenues. With many visiting customers and their own customer roaming abroad, roaming management departments look to deploy on-line monitoring tools and roaming intelligent systems to assure quality of international roaming service and capture the growing roaming traffic revenues.

The functional area of particular interest is VIP (High ARPU) customer management, including the possibility to define alarms and reports for particular inbound roamers. Another area is the steering of roaming, the process by which a mobile operator decides which partner their subscribers will use whilst roaming. Operators want the possibility of identifying steering of roaming activities and roaming service issues to capture and respond to new roaming trends with partner networks.

Nexus Telecom with the Cellusys alliance enables operators to receive the most comprehensive portfolio of roaming management solutions available in the market. Nexus Telecom’s expertise in monitoring and testing, coupled with Cellusys’s active signaling expertise for signaling management, allow implementations to perform in any network topology. The complementary nature of the alliance means that significant advances can be made, and the data shared can be turned into valuable roaming management information.

Roaming Service Monitoring

Nexus Telecom’s NexusNETVIEW Signaling Intelligence Monitoring System, with its International Roaming Management Application (IRM), monitors roaming service QoS inbound and outbound, as well as detecting Steering of Roaming. For VIP customer management, the Subscriber Monitor App is an on-line VIP service quality monitoring system delivering instant feedback if these important customers experience poor access connection to roaming services.

NexusNETVIEW solution provides benefits including:

  • For Marketing – What are the important networks/countries for our VIPs and subscribers?

  • For Planning – To which network/country do we have international capacity issues?

  • For Operations Center:

    • Do we have data service connectivity with roaming partners?

    • Can our Outbound Roamers receive voice calls and use the SMS service?

    • Do we have voice call, data and SMS service issues for inbound roamers?

NexusNETVIEW IRM provides online Call Data Records (CDR) for international signaling roaming services and VIP customer service monitoring.

Steering of Roaming (SoR) and Roam intelligence

For members of Global Alliance Networks, network operators must keep their roaming subscribers on the partner networks. However, often they need an additional solution to measure and report statistics, including:

  • Success-Rate of Preferred Networks vs. Non-preferred Networks

  • Trend-Analysis of SoR Success and immediate recognition of new trends in SoR

  • Tecognition of SoR Procedures Applied

  • Identification of SoR Methods by different Operators

  • Identification of Lost Roamers due to SoR

  • MAP Statistic Reports on Inbound SoR Manipulation:

Nexus Telecom’s partner for Roaming Intelligence, Cellusys, provides Roam Intelligence (RI). The Roam Intelligence (RI) system is responsible for reporting on the behavior of inbound and outbound roamers on the network, giving accurate network information not previously available. This enables Operators to maximize revenues while establishing, maintaining and controlling roaming agreements with their partner operators.

Roam Intelligence (RI) provides essential analysis for every roaming department, both commercially & technically. RI gives a full overview and analysis with 15+ advanced reports of critical roaming signaling KPIs required to detect unexpected trends, perform network enhancement and maintain customer satisfaction.

The system also provides access to real-time roaming activity, helping operators solve roaming issues for inbound and outbound subscribers. Roaming managers receive a full overview and analysis of all roaming activity with advanced reports combing the customer activity and statistical data points required to perform traffic analysis, protect and increase roaming revenue, and prevent customer churn.

Did your father ever tell you to do things yourself when you wanted it done right and become a success? (at least for your own purposes). I believe that’s true and its also important in business that promotes openness and transparency.

An example of the dynamics nowadays that roaming is experiencing big changes are still to come but the trend is that there is a concern from mobile operators to more efficiently use the resources available and optimize business models to avoid subscribers turning their backs in a rage caused by desperation to get fair tariffs. One can say there are some good options available to focus efforts in the right direction and I believe the concept of a multi-IMSI roaming Hub is among those.

The solution offers a whole new model to MNOs of all types (Full MVNO, MVNO light and operators). The main difference between the traditional dual-IMSI Roaming Hub model is that here the full MVNO is offered 2 options to obtain  new revenues, buying from the Roaming Hub or selling to the Roaming Hub.

In North America is where this transition has found the required support form regulatory bodies and groups from the Industry. Below you find a simple description I prepared in order to show you briefly the concept and benefits in each case.

Before going further, the concept shares the benefits offered by the dual-IMSI Roaming Hub in terms of increased revenue, by accessing new roaming partners in one-shot and saving costs by reducing the administrative costs in clearing house and settling procedures as well as testing resource allocation. But the real beauty lays on the fact that by becoming a member of the hub, the full MVNO is capable of buying and selling his IOTs by having access to a trading platform from the IOT offered by all hub members.


This is done by selecting outbound in one, several or all foreign networks multi-IMSI Roaming Hub offers as its members. Each new Member / network participant provides its IMSI and becomes available to be used by any member. Then the Roaming Hub takes the role of a dealer and offers the right place for optimised negotiation on outbound roaming tariffs all around the world.

The subscriber keeps his home MSISDN for all services, Voice, SMS, data, and access seamlessly like at home. He is controlled by home HLR like in the usual Roaming Hub. The operator is in control of his outbound roaming offers, something which not all networks currently allow.

The pre-negotiated IOT rates available on RH trading platform, are often lower than what is offered by competing dual-IMSI solutions.


Having negotiated, a previously discounted IOT becomes in this model an attractive asset to be leveraged for the full MVNO by offering those discounted tariffs to other members like MVNOs in other areas of the world that have no access to them. It turns in a new revenue stream generator that allows new profits in wholesale operations that were not available in the old model. I On top of that, it improves the negotiation power of the selling network for increases in outbound traffic to offer to roaming partners.

Until few years ago, there was only the traditional Roaming Hub solution and the target market for the vendors were those who just started operations and needed a fast footprint with low admin costs. With the new concept and the strategy where open connectivity,wholesale alliances and cooperation are driving business, a platform to buy and sell your roaming capabilities at a fair price seems to be a wise decision.

Over the course of four days, 24-27 February 2014, Mobile World Capital Barcelona will host the world’s greatest mobile event.

Meet Cellusys at Mobile World Congress in Barcelona at 6C58 where we will be unveiling our next generation LTE Roam Management Suite as well as the latest advances in SMS Firewall from Cellusys SMS Defence.

Mobile is a catalyst of change and innovation. Mobile is creating the next connected device that transforms communication. Advancing the next payment system that alters commerce. Mobile World Congress is the blueprint for the NEXT big innovation. Whatever is coming NEXT will likely be born at Mobile World Congress 2014 – either announced on stage during the Conference programme, showcased in at the Exhibition, or conceived during one of the thousands of meetings taking place during the week.

If you’re a part of the mobile industry, you won’t want to miss it. Join us in Barcelona at 6C58 where we are Creating What’s NEXT, or book a meeting though with our management board and sales team.

When National Mobile Roaming becomes a conflict of Interest

Mobile Operators are constantly looking to enhance their network coverage in order to attract more subscribers and increase customer satisfaction. These enhancements, however, can be both time consuming and costly   pushing Operators towards National Roaming Partner agreements in order to provide better network coverage. By having these agreements in place, Operators are able to provide service to their subscribers in geographic areas they currently cannot reach or are commercially impractical.

Although this can be a beneficial solution for mobile operators, it can cause a conflict of interest in some of their serving areas. Described below is a challenge that one of our clients faced recently and requested Cellusys to implement a solution for this problem:

Our client is a major operator in a large country, which has put in place multiple national roaming agreements with other national operators in order to provide better network coverage to its subscribers.

They noticed that their national roaming partners were expanding their network coverage to overlap their home network coverage area either by adding more base stations or increasing transmission power. This greatly increased the chance of their subscribers registering on the roaming partner’s network even when they are in the home network coverage area. This has resulted in millions of dollars in lost revenue every month to our client.

National roaming agreements tend to be revenue share by nature and require great attention by the home operator on controlling their subscriber roaming activities. Failing to pay attention to this can cause the home operator to face significant revenue losses while their national roaming partners profit significantly.

Basically operators need to control their subscribers roaming activities when moving around following coverage areas.

  1. Home Network Coverage Area Only
  2. Home/Roaming Partner Coverage Area
  3. Roaming Partner Coverage Area Only

Operators can successfully achieve this by incorporating the Cellusys National Steering System into their network which prevents subscribers from registering on the national roaming partner’s network where there is coverage overlap and re-directing them to the home network when the home network becomes available again. In a nutshell Cellusys National Steering enables the home operator to gain control of their subscribers when roaming in partner’s network coverage to ensure that the national roaming partners are only utilised where needed.

Cellusys has implemented National steering successfully for several operators worldwide to help them visualise their national roaming landscape and minimise revenue loss to their national roaming partners.

NEW ORLEANS, LA and ATLANTA, GA– Cellusys announced today that it is officially launching its SMS Firewall, SMS Parental Control and Roam Management Solutions to the wireless market in the US, Canada and South America. Cellusys’ products provide revenue-generating solutions that add value to application requirements in the wireless environment. Cellusys will showcase these solutions for carriers at CTIA at the Enterprise Ireland Pavilion, Hall F, Booth #5343 from May 8th – 10th, 2012.

The Cellusys Software technology runs on application blades embedded in PT’s SEGway Signaling Platforms, allowing multiple applications to run concurrently on the same platform. This flexible architecture provides the scalability and high performance needed by both large and small wireless networks, all within a small footprint. The strategic relationship with PT, a U.S.-based company, allows Cellusys to seamlessly penetrate the Americas market as PT will provide installation and support activities as required. In addition, through a channel partner arrangement with Cellusys, PT is reselling the solutions under the SEGway brand. Cellusys has already developed a successful customer base with top-tier wireless operators in Russia, the Middle East, Africa and the Asia Pacific regions.

Cellusys’ technology features comprehensive SMS Firewall, Roam Management Solutions and other value-added services such as Parental Control. The innovative Cellusys SMS Firewall includes features which cover SMS Anti-Spam, SMS Faking, SMS Spoofing, SMS Flooding, SMS Anti-Virus, Home Routing, Key Word Analysis plus the ability to incorporate into MVNO’s and Multiple Operator Networks. The Cellusys Roam Management Suite includes sophisticated solutions for Roam Steering, Anti-Steering Detection, Pre-Paid SMS Roaming and Roam Welcome. For mobile operators who want to offer their customers a valuable and custom way of protecting their children, Cellusys has Cellusys Parental Control applications which manages the flow of SMS Messages to/from children’s mobile phones, preventing cyber bullying and allowing use of phones within predefined periods.

“The Northern and Southern American wireless operators are facing challenges with maintaining customer retention and increasing revenues,” said Dawood Ghalaieny, CEO, Cellusys. “The Cellusys Application Portfolio has been successful around the world. Mobile networks operators have found our solution can increase revenue, add more value and protect their customers. We are now bringing these solutions to the American market at CTIA.”

About Cellusys
Cellusys is a privately held company, based in Dublin, Ireland. It provides leading-edge solutions for mobile networks including comprehensive SMS Firewall, Roam Management Solutions and other value-added services such as Parental Control. For more information visit:

About PT
PT is a global supplier of advanced network communications solutions to service provider, government, and OEM markets. PT’s portfolio includes IP-centric network elements and applications designed for high availability, scalability, and long life cycle deployments. The industry-leading Monterey MicroTCA and IPnexus platforms anchor the company’s broad range of offerings on PT’s own IP-native, highly integrated platforms and element management systems. OEMs and application developers, including PT itself, leverage the robust carrier grade Linux development environment and rich suite of communications protocols (PT’s NexusWare) of IPnexus Application-Ready Systems as a cornerstone component of their end product value proposition. PT’s SEGway Signaling Solutions provide affordable, high density signaling, advanced routing for LTE and IMS applications, IP migration, gateway capabilities, SIP bridging, and core-to-edge distributed intelligence, as well as features such as Number Portability and SMS Spam Defense. The company’s Xpress NGN applications enable evolving Mobile 2.0, Multi-media, and IMS based revenue-generating services. PT is headquartered in Rochester, NY and maintains sales and engineering offices around the world. For more information visit:

Rick Carter
Vice President, Global Sales and Marketing
Phone: +1 770 536 2425
Mobile: +1 678 451 4380