Free Windows Softphone
SipLine is a native Windows SIP softphone built for professionals. HD audio, military-grade encryption, and CRM integration — all in a lightweight desktop app.
Why Choose SipLine for Windows?
Native Windows App
Built specifically for Windows 10 and 11. No browser, no Java, no external dependencies. Installs in seconds.
HD Audio Quality
Opus and G.711 codecs for crystal-clear voice. Adaptive jitter buffer and echo cancellation for perfect calls every time.
TLS/SRTP Encryption
Secure your calls with TLS transport and SRTP media encryption. DPAPI credential protection on Windows.
Multi-Account Support
Register multiple SIP accounts simultaneously. Switch between lines instantly during calls.
Plugin SDK
Extend SipLine with custom plugins using the C# SDK. CRM integration, call recording, custom UI — the possibilities are endless.
Enterprise Deployment
Silent MSI installer with GPO support. Deploy SipLine across your organization in minutes.
Get Started for Free
SipLine Community is 100% free for personal and small business use. No time limit, no feature crippling. Upgrade to Pro or Enterprise when you need advanced features.
- Unlimited SIP calls
- HD audio with Opus codec
- TLS/SRTP encryption
- Up to 2 SIP accounts
- Basic call transfer
Ready to Transform Your Business Telephony?
Download SipLine now and make your first call in under 2 minutes.