Skip to main content

​
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.

​
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:
sip:axg8odfh9dw.sip.livekit.cloud
When you add the number in telli, you’ll need:
FieldDescriptionExample
Phone NumberYour phone number in E.164 format+14155551234
Termination URIProvider hostname for outbound callspstn.provider.com
Auth UsernameSIP authentication usernameuser123
Auth PasswordSIP authentication passwordsecurepass456
Transport ProtocolSIP transport protocol. Supported values are TCP, UDP, and TLS. Defaults to TCP.TCP
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.

​
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

​
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.

​
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.

​
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.