Bespoke VoIP Solutions
Voice should work like a well-run service: dependable, clear, and shaped around how your teams actually operate. We craft open-source VoIP platforms that are engineered to fit your workflows - giving you the freedom to adapt, integrate, and evolve without being boxed in by someone else's product roadmap.
From first principles design to long-term optimisation, we stay hands-on and transparent, putting you in control of a voice platform built to meet today's demands and tomorrow's change.
What Are Bespoke VoIP Solutions?
Bespoke VoIP solutions are purpose-built voice platforms engineered to meet your business's specific operational and technical requirements. They are designed around the realities of how calls need to move through your business, rather than forcing you into standard feature sets or fixed vendor assumptions.
In practical terms, bespoke VoIP is an architecture-led approach that defines call control, routing, security, integrations, and resilience as first-class requirements. This allows the platform to align with your network, user roles, compliance obligations, and service expectations.
These systems are typically built using established open-source components and custom engineering, giving you control over deployment choices and long-term evolution. The result is a voice platform that can be adapted as your business changes, without being constrained by licensing models or platform limitations.
Platforms & Technologies We Work With
Non-exhaustive - depends on requirements.
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Core Softswitch & Media
FreeSWITCH, Yate, Asterisk
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SIP Edge, Routing & Load Balancing
Kamailio, OpenSIPS
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Media Proxy, NAT Traversal & SRTP
rtpengine, RTPProxy, MediaProxy
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Application Logic & Call Control
Custom call applications (e.g., drachtio where appropriate)
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Security & Hardening
TLS/SRTP, SIP edge protections, rate limiting / abuse controls, automated failover patterns
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Integrations & Middleware
Custom APIs and middleware for CRMs, ticketing, identity/SSO, billing, data pipelines
Communication Challenges We Help You Overcome
Voice communication remains business-critical, yet many businesses run into preventable blockers as they modernise or scale. Common issues include legacy constraints that slow change, fragmented tooling that reduces visibility, and service limitations that become costly the moment requirements move beyond the standard hosted model.
We tackle these challenges with targeted design and delivery: mapping real call journeys, engineering around integration and compliance requirements, and building resilient architectures that scale predictably. By using open-source foundations with bespoke implementation, we reduce lock-in while giving you the control needed to run voice as a dependable, measurable service.
Legacy PBX Burden
Ageing platforms raise overhead and restrict change. We modernise with a staged migration plan and a future-ready architecture built around your call flows.
Growth Pressure
Expansion brings higher volumes, more sites, and remote teams that strain fixed platforms. We design for horizontal scale with clear capacity planning and load distribution.
Security & Compliance Exposure
Generic controls can fall short in regulated environments. We implement tailored security policies, access controls, and audit-ready configurations aligned to your risk profile.
Integration Gaps
Disconnected systems reduce efficiency and create manual workarounds. We deliver API-led integrations and middleware so voice data and workflows connect cleanly to core systems.
VoIP by Industry
Bespoke VoIP delivers the most value when designed around real operational pressures rather than abstract features. We build voice platforms that support daily workflows, regulatory requirements, and growth patterns across industries.
Telecoms
High-volume call routing, SIP interconnects, and carrier-grade resilience for uninterrupted service delivery.
E-commerce
Integrated voice and CRM workflows that improve customer support responsiveness and order handling.
Healthcare
Secure, compliant communication supporting clinical teams, patient coordination, and telemedicine.
Education
Reliable voice services for campuses and remote learning environments, supporting staff, students, and administration.
Logistics
Real-time voice connectivity for dispatch, drivers, warehouses, and customer service teams.
Hospitality
Unified guest communication and internal coordination across properties and departments.
Core VoIP Capabilities & Outcomes
Our bespoke VoIP solutions are engineered for reliability, control, and long-term adaptability - ensuring your voice platform remains an asset, not a constraint.
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Custom Call Flows & Routing
Voice logic designed around your business processes, not platform defaults. -
Scalable Architecture
Systems grow with call volume, users, and locations without disruption. -
Secure by Design
Encryption, access controls, and network protections aligned with your risk profile. -
Seamless Integrations
Tight integration with CRM, helpdesk, analytics, and internal systems. -
High Availability & Failover
Redundant components and automated failover ensure continuity. -
Full Platform Ownership
No forced licensing models or vendor lock-in.
From Design to Go-Live: Our Implementation Process
We don't deploy one-size-fits-all platforms. Every VoIP deployment is built around your technical environment and operational goals. We follow a structured, collaborative process to ensure reliability from day one and flexibility for the future.
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Discovery & Requirements Mapping
We review your current telephony platform, network topology, user groups, and call-critical workflows. We also capture compliance requirements, reporting needs, and growth targets so the platform is designed for what you must deliver, not just what you have today.
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Solution Architecture & Detailed Design
We produce a tailored architecture covering SIP routing, media handling, redundancy, and security controls. We define call flows, numbering, dial plans, integration points, and operational runbooks so there is a clear blueprint before build begins.
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Build, Test & Controlled Migration
We implement the platform, then validate behaviour with structured testing across call flows, failover, and load scenarios. Migration is planned to minimise disruption, including phased cutovers, SIP trunk integration, number porting coordination, and rollback options where required.
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Operational Handover & Support Options
We provide documentation and knowledge transfer tailored to your team's responsibilities, from day-to-day operations to change management. Ongoing support is available through SLA-Based Technical Support or Dedicated Support Hours, depending on your needs.
Why Choose OnyxSis?
The Team That Thrives on the Tough Problems
We take on complex communication challenges that others avoid, bringing curiosity, rigour, and a practical mindset to every engagement. You get a partner that stays accountable from first design decisions through to long-term outcomes.
Open-Source Values, Professional Delivery
We're passionate about open-source software and apply it with the discipline expected in production environments. That balance gives you freedom and control without compromising reliability or governance.
Evidence, Not Assumptions
In our Inter-Protocol Transcoder case study, we delivered SIP-native capabilities that had been blocked by architectural constraints in a proprietary environment. The outcome included a 22% reduction in support tickets related to call control issues and a 15% reduction in complaints about call disruptions.
The solution also achieved a 99.99% success rate for SIP call feature usage, demonstrating consistent performance under real operational conditions. This is the standard we aim for: measurable improvements, delivered through careful engineering and transparent implementation.
Support That Stays with You
After go-live, we stay engaged with proactive guidance, optimisation, and hands-on troubleshooting to keep your platform stable as usage shifts.
For teams that need defined assurance and response times, we offer SLA-Based Technical Support, or Dedicated Support Hours for flexible, predictable access to our engineers.
If you want a voice platform you can truly control and evolve, we'll build it with you and support it long-term - share your constraints, edge cases, and ambitions, and we'll turn them into a clear, buildable plan.
Bespoke VoIP That Performs
If voice is business-critical, it deserves proper engineering. We build tailored VoIP platforms that scale predictably, integrate cleanly, and stay transparent from design through long-term optimisation.
