SIP trunking allows you to connect your own phone number to Rounded to receive and make calls. This solution is ideal for:
  • Using your existing numbers
  • Benefiting from preferential rates from your operator
  • Keeping control over your telephony infrastructure

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Rounded SIP origination URI

To configure your SIP trunk, you will need to use this origination URI: 
sip:sip.callrounded.com;transport=tcp

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Configuration methods

This method uses standard SIP trunk services from major providers. It’s simple to configure and compatible with most operators. Documented providers: Other providers: Any standard SIP trunk provider will work with Rounded. The above are just our documented examples.

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Method 2: Custom configuration

For specific needs or advanced configurations, contact our technical team: 📧 team@callrounded.com Our team will support you with:
  • Custom SIP configurations
  • Integrations with existing PBX systems
  • Multi-tenant configurations
  • Dedicated technical support

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Configuration in Rounded

Rounded SIP Trunk Configuration

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1. Phone number settings

  • Phone number: Your number in international format (e.g.: +33156273645)
  • Friendly name: A descriptive name to easily identify this number

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2. SIP Trunk settings

  • Termination URI: Your provider’s SIP address (e.g.: sip.myprovider.com)
  • Username: Optional, provided by your SIP operator
  • Password: Optional, provided by your SIP operator

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Call flows

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Outbound calls

When your Rounded agent makes a call:
  1. Rounded routes the call to your termination URI
  2. Your SIP provider routes the call to the recipient
  3. The caller ID displayed is the one configured

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Inbound calls

When someone calls your number:
  1. Your SIP provider receives the call
  2. It transfers it to the Rounded URI: sip:sip.callrounded.com;transport=tcp
  3. Rounded triggers your voice agent

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SIP Trunk advantages

Reduced costs: Use your negotiated rates
Flexibility: Keep your existing numbers
Scalability: Easily add new numbers
Reliability: Redundancy and high availability

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Next steps

  1. Choose your SIP provider - use our documented guides (Twilio, Telnyx, Zadarma) or any other SIP provider
  2. Configure your SIP trunk according to the provider’s guide
  3. Test the configuration with a test call
  4. Deploy your voice agents
Using a different provider? No problem! Any standard SIP trunk will work - just use the Rounded origination URI: sip:sip.callrounded.com;transport=tcp
💡 Tip: Start with a test number before migrating your production numbers.