openSIPS vs Flexisip
A side-by-side comparison of openSIPS and Flexisip — pricing, license, deployment, and where each tool wins.
openSIPS
opensips.org
SIP proxy/server for voice, video, IM, presence and any other SIP extensions.
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 | openSIPS | 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 openSIPS if…
- ✓You prefer openSIPS's feature set or ecosystem fit.
Pick Flexisip if…
- ✓You prefer Flexisip's feature set or ecosystem fit.