Can you take over or optimize our existing OpenSIPS?

Yes. We map and document inherited setups, tune throughput and routing, harden security, and support them long term.

Do you handle security and anti-fraud at the SIP layer?

Yes. We add rate limiting, call admission control, IP reputation and filtering, topology hiding, and fraud detection so bad traffic is stopped at the edge.

OpenSIPS Development & Consulting

OpenSIPS development for high-throughput SIP routing at scale

Q: Can OpenSIPS handle high concurrent calls and CPS?

Yes. OpenSIPS is a high-throughput SIP proxy. We design active-active clusters with load balancing and health checks so the signaling layer scales horizontally and stays stable at peak.

Q: OpenSIPS or Kamailio, which should we use?

Both are excellent open-source SIP proxies and we work with both. The right choice depends on your existing stack, module needs, and team. We help you decide based on your use case rather than a fixed preference.

Q: Can you build an SBC or SIP load balancer with OpenSIPS?

Yes. We build session border controllers, SIP load balancers, and HA front-ends on OpenSIPS, with topology hiding, security, and RTP handling via RTPEngine.

Q: Do we own the source code?

Yes. You own 100% of the source. We hand back clean, documented code and transfer knowledge so you are never locked in.

Build and scale high-throughput VoIP networks with OpenSIPS development services covering SIP routing, SBC, load balancing, high availability, and integrations, backed by experienced OpenSIPS developers.

Building VoIP since

Years in SIP engineering

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Engineers on the team

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Engineer coverage

0 /7

OpenSIPS

SUMMIT 2026

Sponsor and speaker at OpenSIPS Summit 2026

We back the OpenSIPS community, sponsoring and speaking at the annual summit in Bucharest. View the summit

Trusted by Global Clients

Inside your OpenSIPS

Follow a SIP request through OpenSIPS

Click any stage to see the modules and what happens. It mirrors how a real OpenSIPS routing script executes.

1Ingress & sanity 2Security & anti-fraud 3Auth & registration 4Routing decision 5NAT & media 6Forward & track

failure_route / onreply_route

Forward & track

Forwards requests reliably, tracks dialogs, hides internal topology, and retries alternate gateways when needed.

tmdialogtopology_hiding

Simplified for clarity. Your real routing logic is designed around your traffic, carriers, and security needs.

Where we come in

The walls teams hit at the SIP layer

These are the problems senior VoIP teams bring to us and how our OpenSIPS development services solve them.

Throughput Ceiling

Your proxy hits its CPS limit at peak traffic, causing calls to fail.

We redesign it for OpenSIPS load balancing and scalable, multi-process throughput.

Interconnect Breaks

A carrier changes a header and calls start dropping.

We handle OpenSIPS customization, SIP/SDP normalization, and repeatable interop testing.

Fraud Bursts

A traffic-pump attack drives up your bill overnight.

We add rate limiting, call admission control, and edge-level fraud protection.

Fragile Failover

Manual failover slows you down during incidents.

We build OpenSIPS high availability with health checks and automatic failover.

Services

However deep you need us to go

From OpenSIPS consulting and architecture to custom development, optimization, and 24/7 support, we handle as much of your signaling layer as you need.

Architecture & Deployment

Capacity planning, HA design, and clean, documented deployments.

Custom modules & routing

Routing scripts, custom logic, and modules built to your requirements.

Throughput Tuning

Optimize CPS and concurrent call capacity for better performance.

HA & Clustering

Active-active proxies, OpenSIPS load balancing, health checks, and automatic failover.

Security & SBC

Topology hiding, TLS/SRTP, anti-fraud controls, and rate limiting.

Migration & Support

Version upgrades, platform takeovers, and 24/7 OpenSIPS support.

Capabilities

Depth where it matters

For teams that already know OpenSIPS, we go deep where performance, reliability, security, and interoperability matter most.

01 Routing & SIP processing 02 Scale, HA & load balancing 03 Security, SBC & anti-fraud 04 Integration & interoperability

Routing & SIP processing

Dynamic, business-aware SIP proxy routing built for complex call flows.

RFC 3261 proxy and registrar
Dynamic routing with drouting drouting
Dialog and transaction tracking
SIP and SDP manipulation
Per-tenant and per-carrier routing logic
Number and prefix handling

Scale, HA & load balancing

Build OpenSIPS high availability into your platform from the start

load_balancer and dispatcher
Active-active clustering
Health checks and automatic failover
CPS and concurrent-call scaling
Geo-distributed front ends
Graceful capacity control

Security, SBC & anti-fraud

Harden your signaling edge with OpenSIPS SBC development and proactive traffic controls.

Topology hiding
TLS and SRTP
Permissions and IP filtering
Rate limiting and call admission control
Fraud detection and blacklists
RTPEngine integration

Integration & interoperability

Connect OpenSIPS with the systems and services already in your stack.

REST and event interfaces
Billing and CDR integrations
Database and cache backends
WebRTC over WSS to SIP
Media server and PBX integration
Carrier interconnect normalization

What we build

Signaling platforms on OpenSIPS

Custom OpenSIPS development services built for scalable, secure SIP routing.

Class 4 Front-End

Routing and rating-ready infrastructure for wholesale voice.

Session border controller

OpenSIPS SBC development for security, topology hiding, and carrier interoperability.

SIP load balancer

Smart traffic distribution with health checks and failover.

CPaaS signaling backbone

Scalable signaling for CPaaS and UCaaS platforms.

SIP trunking & interconnect

Reliable carrier connectivity with SIP header normalization.

WebRTC-to-SIP gateway

Connect browser calling to your SIP network over WSS.

Don’t see your setup? We provide OpenSIPS customization and integration to build exactly what your network needs.

What you get

Outcomes, Not Just Features

OpenSIPS solutions designed to deliver real results for your network.

Uncapped throughput

Fewer outages

Lower infrastructure costs

Stronger security

Faster interop

Scales with traffic

How we work

A partner, not just a vendor

Clear communication, experienced OpenSIPS developers, and support that continues after launch.

Discovery

We map your traffic, topology, and goals before development begins.

Build or tune

Senior engineers build or optimize your setup with clear documentation.

Deploy

Load testing and a planned cutover help you go live smoothly.

Support

Ongoing monitoring, maintenance, and knowledge transfer keep your team in control.

Our Case Studies

See how our OpenSIPS development services solve real network challenges and deliver measurable results.

North America

Secure IP PBX Solution

How Inextrix’s Secure IP PBX Ensured Confidentiality for a U.S. Healthcare Provider

We are glad to support a leading U.S. healthcare provider in strengthening its communication security and compliance framework. The organization needed a reliable partner to improve confidentiality across patient interactions. With our expertise in secure IP PBX development, we delivered a customized, compliance-ready solution that improved data protection, ensured secure communication flows, and aligned seamlessly with their operational and regulatory requirements.

Industry · Healthcare

Download case study →

Asia

IP PBX

A Turnkey Communication Solution Provisioned With On-Site Deployment & Training

A tailored communication solution is deployed with on-site setup and training services for MKC Infrastructure Ltd, which is one of the renowned construction and infrastructure development companies in India. The system consists of an IP PBX solution, desktop and mobile dialer support, and IP phones.

Industry · Construction & Infrastructure

Download case study →

Frequently Asked Questions

Can OpenSIPS handle high concurrent calls and CPS?

Yes. We build OpenSIPS high-availability clusters with load balancing and health checks to handle high traffic and scale smoothly.

OpenSIPS or Kamailio, which should we use?

Both are powerful SIP proxies. We help you choose based on your stack, requirements, and use case, not a fixed preference.

Can you build an SBC or SIP load balancer with OpenSIPS?

Yes. Our OpenSIPS SBC development covers session border controllers, SIP load balancers, topology hiding, security, and RTPEngine integration.

Can You Optimize Our Existing OpenSIPS Setup?

Yes. We review your current setup, improve routing, throughput, security, and reliability, and provide ongoing support.

Can You Handle SIP Security and Anti-Fraud?

Yes. We implement rate limiting, call admission control, IP filtering, topology hiding, and fraud detection to protect your SIP edge.

Do We Own the Source Code?

Yes. You own 100% of the source code. We provide clean, documented development and knowledge transfer, with no vendor lock-in.

Ready to Get Started?

With decades of experience and know-how in software development essentials, we build future-proof, intuitive, and highly scalable web, mobile, and VoIP solutions. Bring ultimate success to your business with Next-Gen, Tech-Empowered Solutions.

Sales

+1 315 898 1139 (United States)

+91 93166 18150 (India)

+44 20 3769 2439 (United Kingdom)

contact@inextrix.com

HR

+91 7624079397 (India)

Offerings

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About us

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United States

425 W Colonial Dr, Suite 303
Orlando, FL 32804
United States

+1 315 898 1139

United Kingdom

128 City Road
London EC1V 2NX
United Kingdom

+44 20 3769 2439

South Africa

Baobab Office Park, 86 John Vorster Rd, Randpark Ridge 2169
South Africa

+27 10 630 0487

India

508–509, Lilamani Corporate Heights
Ahmedabad, Gujarat 380013
India

+91 93166 18150

Established in 2010, we're a team of tech enthusiasts driving businesses to success with cutting-edge technology.

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