Kamailio vs Flexisip
A side-by-side comparison of Kamailio and Flexisip — pricing, license, deployment, and where each tool wins.
Kamailio
kamailio.org
Modular SIP server (registrar/proxy/router/etc).
Flexisip
linphone.org
Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.
| Feature | Kamailio | Flexisip |
|---|---|---|
| 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 Kamailio if…
- ✓You prefer Kamailio's feature set or ecosystem fit.
Pick Flexisip if…
- ✓You prefer Flexisip's feature set or ecosystem fit.