Telephony and SIP Trunking
Configure your phone numbers and telephony services with Rounded
Telephony and SIP Trunking
Rounded offers you several options to manage your inbound and outbound calls. Whether you want to use our integrated numbers or connect your own telephony services, we have the solution adapted to your needs.
Available telephony options
1. Rounded Numbers (Recommended to get started)
The simplest solution to begin:
- Automatic configuration
- No technical configuration required
- Support included
- Transparent billing
2. SIP Trunk - Connect your numbers
Use your own phone numbers via SIP trunking:
- Keep your existing numbers
- Preferential rates from your operator
- Full control over infrastructure
- Integration with existing systems
Supported SIP providers
We have tested and validated integration with these major providers. Other SIP providers are also compatible - these are just our documented examples:
Twilio
The global leader in cloud communications. Simple interface and robust API.
Advantages:
- Excellent documentation
- 24/7 worldwide support
- Easy integration
Telnyx
Global private network with competitive rates. Ideal for high volumes.
Advantages:
- Very competitive rates
- Quality private network
- Modern API
Zadarma
European SIP provider with competitive international rates and flexible configuration.
Advantages:
- Competitive international rates
- IP and credential authentication
- Multiple server locations
Other SIP providers
Any SIP provider that supports standard SIP trunking will work with Rounded. The providers above are documented examples, but you can use:
- Local telecom operators in your country
- Regional SIP providers
- Enterprise SIP services
- Cloud PBX providers with SIP trunk capabilities
- Any RFC 3261 compliant SIP service
Need help with a different provider? Contact our team for configuration assistance.
Provider comparison
Provider | Ease of use | Pricing | Support | Recommended for |
---|---|---|---|---|
Twilio | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Startups, SMBs |
Telnyx | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | High volumes |
Zadarma | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | European market |
Custom integrations
Using another SIP provider? It will work! Standard SIP trunking is universally compatible.
Contact our technical team if you need help: 📧 team@callrounded.com
We can assist you with:
- Configuration guidance for any SIP provider
- Integrations with existing PBX systems
- Multi-tenant configurations
- Enterprise deployments
- Custom SIP trunk setups
SIP Architecture
Inbound call flow
Outbound call flow
Technical configuration
Rounded SIP origination URI
Recommended parameters
- Protocol: TCP (recommended) or UDP
- Codecs: G.722, G.711A, G.711U
- DTMF: RFC 2833
- Port: 5060 (standard SIP)
Security and compliance
Encryption
- TLS 1.2+ for signaling
- SRTP for audio streams
- Authentication by IP or credentials
Compliance
- GDPR compliant
- European hosting available
- Secure call logs
Next steps
- Beginners: Start with integrated Rounded numbers
- Advanced users: Configure a SIP trunk with your preferred provider
- Enterprises: Contact us for custom configuration
💡 Tip: You can mix both approaches - use Rounded numbers for testing, then migrate to your SIP trunk for production.
Support
Our team is here to support you:
- 📧 Technical support: team@callrounded.com
- 📖 Complete documentation in this section
- 🎯 Configuration examples for each provider