openSIPS vs Kamailio
A side-by-side comparison of openSIPS and Kamailio — pricing, license, deployment, and where each tool wins.
openSIPS
opensips.org
SIP proxy/server for voice, video, IM, presence and any other SIP extensions.
Kamailio
kamailio.org
Modular SIP server (registrar/proxy/router/etc).
| Feature | openSIPS | Kamailio |
|---|---|---|
| Pricing | Free | Free |
| Model | Open-source | Open-source |
| License | CC-BY-SA-3.0 | CC-BY-SA-3.0 |
| Deployment | Self-hosted | Self-hosted |
| Category | Communication - SIP | Communication - SIP |
| Self-hosted | ✓Yes | ✓Yes |
| Free tier | ✓Yes | ✓Yes |
Pick openSIPS if…
- ✓You prefer openSIPS's feature set or ecosystem fit.
Pick Kamailio if…
- ✓You prefer Kamailio's feature set or ecosystem fit.