Hire OpenSIPS Developers & SIP Routing Experts
OpenSIPS expertise is one of the rarest skills in VoIP — and CelloIP has it in depth. Our engineers build carrier-grade SIP routing, LCR platforms, dispatcher load balancers, CPaaS infrastructure, and SBCs. 12+ years, 25+ SIP proxy deployments handling billions of monthly minutes.
From $25/hr — a fraction of what scarce OpenSIPS talent costs in the US/UK ($120–$200/hr). Full-time CelloIP staff, NDA Day 1, full IP ownership.
$25/hr
Starting rate
48hr
Onboarding speed
25+
SIP proxy deployments
NDA
Signed Day 1
OpenSIPS Engineer Profiles
Match the seniority to your SIP infrastructure needs.
OpenSIPS Routing Engineer
$25–$35/hr- Routing script development
- Dispatcher load balancing
- User location & registration
- NAT traversal & RTPProxy/RTPEngine
Senior SIP Architect
$35–$45/hr- LCR (Least Cost Routing) design
- Carrier interconnect routing
- REST management API integration
- Fraud detection & rate limiting
- High-availability clustering
CPaaS Platform Engineer
$35–$55/hr- Multi-tenant SIP platform design
- Dynamic API-driven routing
- Billing integration (CDR)
- OpenSIPS + FreeSWITCH orchestration
- Real-time provisioning
Full OpenSIPS Expertise Stack
Nine domains across routing, media, and monitoring.
Routing Logic
Complex OpenSIPS Script routing, transformations, dialog tracking, sequential/parallel forking
Load Balancing
dispatcher & load_balancer modules, capacity-based routing, health checks, automatic failover
LCR & Carrier Routing
Least Cost Routing, carrier interconnect, prefix-based routing, dynamic rate tables
REST Management
mi_http module, runtime config reload, statistics API, Grafana dashboard integration
SBC & Security
Topology hiding, rate limiting, fraud detection, anti-flood protection, TLS/SRTP
Media Handling
RTPProxy, RTPEngine integration, NAT traversal, transcoding orchestration, media relay
Database Backends
MySQL, PostgreSQL user location, CDR, dialog persistence, distributed cache (Redis)
WebRTC & WebSocket
OpenSIPS WebSocket transport, WebRTC-to-SIP signalling, browser client registration
Monitoring
Homer/HEP capture integration, sipcapture module, Prometheus metrics, call trace analysis
Frequently Asked Questions
How much does it cost to hire an OpenSIPS developer?
From $25/hr for mid-level, $35–$55/hr for senior carrier-routing architects — 60–70% less than US/UK rates. OpenSIPS expertise is genuinely rare, making this exceptional value. NDA Day 1, 48-hour onboarding, full IP ownership.
What can an OpenSIPS developer build for me?
Carrier-grade SIP routing platforms, LCR systems, dispatcher-based load balancers across media server clusters, CPaaS platforms with REST-driven routing, SBCs, wholesale VoIP termination platforms, and multi-tenant SIP infrastructure.
Do your engineers know both OpenSIPS and Kamailio?
Yes. CelloIP engineers are proficient in both leading SIP proxies (both forked from OpenSER). We advise which fits your use case and can deploy them together — Kamailio edge + OpenSIPS routing + FreeSWITCH media is a proven three-tier pattern.
How quickly can an OpenSIPS engineer start?
48 hours. NDA Day 1, access provisioned in hours, contributing routing logic by end of Day 1. No recruitment process — interview one engineer, agree, they start.
Can you help migrate from a commercial SBC to OpenSIPS?
Yes. We migrate from commercial SBCs (Oracle/Acme Packet, Sonus/Ribbon, AudioCodes) to OpenSIPS-based open-source SBCs — typically reducing licensing costs by 70–90% while retaining carrier-grade functionality.
Ready to Hire an OpenSIPS Expert?
Tell us your SIP routing requirements. We'll match you with the right engineer in 24 hours. Free technical call, NDA before discussion.