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Overview

Custom SIP trunk integration allows you to bring your own phone numbers from external SIP providers to telli.
Custom SIP trunks work alongside telli-provided numbers. Use both or either based on your needs.

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Configuration

To import a SIP number, configure both sides of the connection:
  • In telli, add the phone number, provider termination URI, SIP credentials, and transport protocol. These settings let telli place outbound calls through your provider.
  • In your SIP provider, route inbound calls for that number to telli. Provider names differ, but the inbound destination is always:
When you add the number in telli, you’ll need:
Do not include the sip: protocol prefix in the Termination URI. Use only the hostname or IP address. The inbound destination in your SIP provider does use the sip: prefix.
Choose the transport protocol that matches your SIP provider’s trunk settings. If your provider does not specify one, leave the default TCP.

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Adding a Custom SIP Trunk

1

Navigate to Phone Numbers

Go to the Phone Numbers section in your telli dashboard
2

Click Import Number

Click the Import Number button
3

Enter Configuration

Fill in your phone number, SIP credentials, and transport protocolImport Number dialog with phone number, SIP credentials, and transport protocol fields
4

Save and Test

Click Import Number and test with a call

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Provider Examples

Use these examples to map provider settings to the telli fields. Each provider setup includes inbound routing to telli and the outbound termination settings you enter in telli.

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Twilio Elastic SIP Trunking

1

Create or open an Elastic SIP Trunk

In Twilio Console, create an Elastic SIP Trunk or open the trunk used by your imported number.
2

Route inbound calls to telli

Go to Origination and add sip:axg8odfh9dw.sip.livekit.cloud as the Origination URI.
3

Configure outbound settings

Go to Termination and note the Termination URI, for example your-trunk.pstn.twilio.com or your-trunk.pstn.frankfurt.twilio.com. Under Authentication > Credentials, create a username and password.
4

Assign the phone number

Make sure your phone number is assigned to this trunk.
5

Add to telli

In telli, enter your phone number, the Twilio Termination URI without sip:, the Twilio credentials, and the transport protocol configured for your trunk.

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Telnyx

1

Create an FQDN SIP connection

In Telnyx, create a SIP connection and select the FQDN connection type.
2

Route inbound calls to telli

In Authentication and Routing, add axg8odfh9dw.sip.livekit.cloud as an FQDN and set DNS Record Type to SRV. Do not include the sip: prefix in this Telnyx field.
3

Set number formatting

Set both Destination Number Format and Origination Number Format to +E.164.
4

Configure outbound credentials

Configure credential-based authentication with a username and password.
5

Assign the phone number

Make sure your phone number uses this Telnyx SIP connection.
6

Add to telli

In telli, enter your phone number, sip.telnyx.com as the Termination URI without sip:, the Telnyx credentials, and the transport protocol configured for your SIP connection.