Flexisip vs Kamailio
A side-by-side comparison of Flexisip and Kamailio — pricing, license, deployment, and where each tool wins.
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.
Kamailio
kamailio.org
Modular SIP server (registrar/proxy/router/etc).
| Feature | Flexisip | 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 Flexisip if…
- ✓You prefer Flexisip's feature set or ecosystem fit.
Pick Kamailio if…
- ✓You prefer Kamailio's feature set or ecosystem fit.