A French telecom provider moved its hosted voice business from Vodia PBX to Yeastar. After the migration, orders followed with demo, and its cloud phone system user seats grew eightfold in two years.
Key Takeaways
- Who: Rezzo, a Marseille-based telecom solutions provider serving operators, integrators, ESNs, and IT resellers across France. Founded by Cyril Cassignol and Stéphane Bernard, the company runs a 100% indirect model, supplying white-label telephony, internet, and mobile solutions, plus LUCY, its own billing and management software for telecom operators.
- What: Rezzo ran its hosted voice business on Vodia, and in day-to-day work the team found configuration on the platform more involved than they would have liked. When they evaluated Yeastar, they saw a better fit for their channel model and cloud ambitions.
- Outcome: Configuration and management workload slashed with Yeastar P-Series Phone System. A simple presentation to partners and resellers turned into orders, and the hosted voice business scaled with them.
- Cloud user seats grew roughly eightfold within two years, driven by P-Series yPBX Cloud Edition
- Yeastar YCM platform put business phone system provisioning, monitoring, updates for every operator customer in one portal, making Rezzo’s white-label telecom business far easier to run.
- Smooth platform transition with minimal disruption to customers.
- New customer opportunities driven by customer recommendations.
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Behind the Story: A Supplier to Telecom Suppliers
Rezzo operates from Marseille, where it has carved out a specific niche in the French telecom market: it is a supplier to other suppliers. Its customers are telecom operators, integrators, and IT resellers, all of them reselling telecom services under their own brands.
That channel-only positioning shapes what Rezzo needs from a PBX platform. Its hosted telephony offering runs in white label, which means every configuration hurdle it encounters gets passed downstream to a reseller who lacks the time to wrestle with it.
When a supplier in this position starts weighing platforms, the evaluation rarely stays in the engineering room. It shows up in every demo, every quote, and every rollout a partner attempts.
A Platform That Worked, and One That Fit Better
Rezzo’s hosted voice business previously ran on Vodia. The platform worked. The feedback was a matter of day-to-day experience. By the account of Ezechiel Ngoupande, Rezzo’s administrator of systems, networks, and VoIP, configuration on the Vodia platform felt a bit more involved than the team would have liked.
«At first, we were using a solution called Vodia, which is a bit complicated to set up. As soon as we switched to Yeastar, we gave presentations of the solution to our partners, who found it simple and started placing orders.»
In a channel business, preferences like this compound. Resellers experience a platform through demos and rollouts, not the spec sheets, and a solution that is quicker to configure and easier to present shortens the distance between demonstration and order. That is a commercial advantage, and it is the gap Yeastar closed.
That impression is a customer’s lived experience rather than a lab result, but structured product testing points the same way. A side-by-side evaluation of the two platforms highlights where Yeastar pulls ahead on configuration, management, and user experience:
| Comparision | Vodia PBX | Yeastar P-Series Phone System |
|---|---|---|
| Call Flow Designer | Code-based configuration via JavaScript code; supporting call control, HTTP requests, email notifications, and address book lookups | Visual drag-and-drop Call Flow Designer; Supporting call control, HTTPS requests, email notifications, third-party database authentication, queue status queries, and more |
| Auto Provisioning for IP Phones | 19 phone brands | 22 phone brands and 500+ models |
| White-label Branding Setup | Code-based configuration; time-consuming and difficult setup | Web-based configuration, no coding needed; changes at any time |
| Mobile Client Capabilities | Basic features like contact synchronization, call forward/transfer, voicemail, etc | Includes all Vodia features plus Call Flip, Local Conference, Native Recordings, and more |
| Omnichannel Messaging | SMS and WhatsApp (inbound only) | SMS, Bulk SMS, WhatsApp (inbound & outbound), Website Live Chat, Facebook Business |
| AI Capabilities | Call transcription only. AI Receptionist setup requires custom JavaScript coding. | Call transcription and summary. Point-and-click AI Receptionist setup, no programming required. |
For the full picture, covering architecture, features, integrations, and provider support, download the complete comparison document: Yeastar vs Vodia Comparison Sheet.
Why Yeastar Won the Evaluation
Rezzo’s introduction to Yeastar began with product training, the company’s first hands-on exposure to the platform. Three factors decided the adoption, in the order the team cited them: the responsiveness of technical support, the breadth of the solution’s feature set, and an intuitive interface.
«I found the solution easy to use, intuitive, and the interface was very user-friendly.»
Ezechiel Ngoupande, Administrator of Systems, Networks and VOIP, Rezzo
The order matters. For a provider serving third-party resellers at scale, day-to-day operations depend on how quickly the vendor’s support team answers when something breaks on a customer site. Features can be compared in a spec table; support responsiveness can only be experienced.
A fourth factor matters for the long run: pace of development and a true partnership. Yeastar listens to partner feedback and ships new features monthly (averaging one major release per quarter) and, crucially, does not force upgrades on providers. Rezzo can adopt changes when its own schedule allows. In a market where customer expectations shift year over year, that cadence makes a platform decision future-proof rather than a snapshot of today’s feature list.
One System, Three Editions Built for Broader Market Coverage
Cloud expansion is Rezzo’s growth story, and Yeastar P-Series Phone System’s deployment model is built for it. The system ships in three editions: a hardware appliance for on-site delivery, a dedicated single-instance Software Edition, and a multi-instance Cloud Edition. Rezzo can therefore match each telecom operator customer to the deployment that fits.
Whichever edition a customer runs, Rezzo manages it from one place. Yeastar Central Management (YCM) platform provides centralized monitoring and management across all three editions, with provisioning, updates, alarms, and capacity handled from a single place. As an operator, Rezzo can also open reseller accounts for its telecom operator customers and assign permissions within them, so customers self-serve inside boundaries Rezzo defines and day-to-day operations become simpler for everyone.
The white-label story goes a layer deeper than branding. Both YCM platform and the P-Series Phone System can be quickly white-labeled, so the entire stack carries Rezzo’s own brand. Managing those brands is straightforward inside YCM, where Rezzo can set up and maintain multiple white-labeled P-Series PBX instances in one place. That structure extends the white-label model to Rezzo’s own customers: each telecom operator can sell under its own brand, while Rezzo manages all of those brands from a single platform. For a company whose business model is 100% white-label, the brand architecture and the management platform finally speak the same language.
Growth on the Yeastar Platform
Rezzo’s assessment of the commercial impact is direct: its partners order a lot. Asked whether Yeastar’s offering helps it compete in the local market, the company points to differentiation and new project wins rather than price alone.
«Yeastar enables us to offer a modern, flexible, and competitive telephony solution, which helps us stand out and win new projects. The ease of deployment, the solution’s reliability, and its rich feature set allow us to meet our customers’ needs over the long term and enhance their satisfaction.»
Customer satisfaction has become a growth engine of its own: satisfied users recommended the solution to other businesses, an organic referral loop that helped Rezzo attract additional customers and expand its market presence.
«Our customers are satisfied with the solution because it provides smooth and fast communication.»
For a company whose stated mission is to «support and simplify the daily life of our partners,» a platform its partners describe as simple is more than an internal win. It is the product working the way the business model needs it to.
Ready to Make a Similar Move?
Decisions about UCaaS and hosted PBX platform migration rarely come down to a single demo. Telecom service providers that make the move successfully tend to follow the same three-step path that Rezzo did: Take an honest inventory of your current platform: how long configuration takes on a busy week, how often your team fields support tickets you cannot escalate, and how your resellers react in demos. If the answers make you uncomfortable, that is the signal your current platform is holding you back.
If you are weighing your PBX platform options, the Yeastar team can walk you through what a switch would look like for your installed base and how Yeastar solution can help you address your challenges.
