Telnyx Configuration

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Prerequisites

• An active Telnyx account
• A Telnyx phone number or SIP trunk
• Access to the Telnyx portal

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Step 1: Create a SIP Connection

1. Log in to the Telnyx Portal
2. Navigate to Voice > SIP Trunking (or search for “SIP Connection”)
3. Click Create SIP Connection

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Step 2: Configure Details

1. Enter connection details:
   • Name: “TELNYX SIP TRUNK ROUNDED” (or your preferred name)
   • Type: Select FQDN (recommended for Rounded integration)

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Step 3: Authentication and Routing

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Method A: Credentials (Username/Password)

• Select Credentials
• Enter Username and Password
• Note these credentials for Rounded configuration

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Method B: IP Address Authentication

• Select IP Addresses
• Add Rounded server IPs (contact team@callrounded.com for IPs)

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Step 4: Inbound Configuration

1. Add FQDN for Rounded routing:

• DNS record type: SRV
• FQDN: sip.callrounded.com

2. Configure other inbound settings:
   • SIP transport protocol: TCP (recommended)
   • SIP region: Europe (or closest to your location)
   • Codecs: G722, G711U, G711A (recommended)

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Step 5: Outbound Configuration

• Outbound voice profile: Default
• Localization country: Select your country
• Channel limit: Set according to your needs
• Caller ID Override: Configure if needed

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Step 6: Associate Numbers

1. Go to the Numbers tab in your SIP connection
2. Click Assign number to add existing numbers
3. Or purchase new numbers if needed

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Step 7: Configuration in Rounded

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Number settings

• Phone number: Your Telnyx number (e.g., +15551234567)
• Friendly name: “My Telnyx number”

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SIP Trunk settings

• Termination URI: sip.telnyx.com
• Username: Your Telnyx username (if credential authentication selected)
• Password: Your Telnyx password (if credential authentication selected)

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Step 8: Test the Configuration

1. In Rounded, create a simple voice agent
2. Assign it to your Telnyx number
3. Test:
   • Inbound call: Call your Telnyx number
   • Outbound call: Initiate a call from your agent

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Troubleshooting

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”401 Unauthorized” error

• Check authentication credentials
• Verify that authentication is correctly configured

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Inbound calls don’t pass

• Check the inbound routing configuration
• Ensure the Rounded URI is correctly configured

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Audio quality issues

• Check authorized codecs
• Test different codecs (G.722 recommended)

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“403 Forbidden” error

• Check the authorized IP list
• Contact Telnyx to confirm the configuration

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Pricing

• Competitive rates for international calls
• No monthly fixed fees for SIP connections
• Per-second billing
• Volume-based discounts

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Support

• 📧 Rounded Support: team@callrounded.com
• 📖 Telnyx Documentation: Telnyx SIP Trunking
• 🎫 Telnyx Support: Telnyx Portal > Support

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Telnyx Advantages