Can you migrate an existing Kamailio deployment to OpenSIPS (or vice versa)?

Yes — we've done it both directions. The migration usually takes longer than teams expect because the proxies handle edge cases differently. We run both in parallel on a subset of traffic before full cutover.

Do you customize OpenSIPS Control Panel?

Yes. We treat CP customizations as first-class code — version-controlled, reviewed, and deployed via CI. We've added custom routing tables, billing dashboards, and B2BUA management UIs.

Does OpenSIPS handle WebRTC?

With the proxy-wss and rtpengine-ng-websocket modules, yes. For WebRTC-heavy platforms we sometimes recommend LiveKit or a dedicated media server alongside OpenSIPS — depends on the UX requirements.

Open-Source Platforms

OpenSIPS Development

OpenSIPS shares Kamailio's DNA — both forked from SER — but its module ecosystem, script language, and internal architecture have diverged. OpenSIPS tends to win for deployments that lean heavily on the Control Panel, B2B scenarios handled inside the proxy, and operators who prefer OpenSIPS's script syntax. We deploy OpenSIPS as a load balancer, registrar, least-cost routing engine, carrier-grade SBC, and B2BUA for prepaid platforms. Our work covers opensips.cfg authoring, MI/JSON-RPC integrations, OpenSIPS CP customization, and the supporting rtpengine deployments that make the SIP-only proxy actually carry media cleanly.

Scope This Work → See All Services

Who it's for

Operators already invested in OpenSIPS CP who want deeper customization
Prepaid voice platforms needing B2BUA with real-time credit control
Carriers routing calls across dynamic LCR tables updated in real time
Teams evaluating OpenSIPS vs Kamailio for a greenfield deployment

Our approach

1Use the opensips.cfg include mechanism to split logic into reviewable files
2Drive routing from a database (drouting module) or REST endpoint, not hardcoded rules
3Pair OpenSIPS with rtpengine on dedicated media nodes for clean CPU budgeting
4Instrument every meaningful route with statistics exposed via the MI interface
5Treat OpenSIPS Control Panel as a product — version its customizations, review them in PRs

What you get

opensips.cfg organized by route type with clear module loading comments

drouting or dialplan module configuration with a migration path for routing updates

OpenSIPS CP customizations — custom tools, tables, and dashboards

rtpengine deployment sized for your codec mix and NAT topology

Prometheus-compatible stats exporter for ops dashboards

Runbook covering common OpenSIPS failure modes and recovery steps

Common questions

Related services

Kamailio Development

Dispatcher tuning, SIP routing logic, and Kamailio-as-SBC deployments for carrier platforms.

Session Border Controller Solutions

Open-source and commercial SBC deployments with topology hiding, DoS protection, and media handling.

SIP Development Services

SIP stacks, B2BUA apps, and protocol-level debugging for teams who need more than a library wrapper.

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