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 configure a custom SIP trunk, you’ll need:
| Field | Description | Example |
|---|
| Phone Number | Your phone number in E.164 format | +14155551234 |
| Termination URI | SIP server endpoint | pstn.provider.com |
| Auth Username | SIP authentication username | user123 |
| Auth Password | SIP authentication password | securepass456 |
Do not include the sip: protocol prefix in the Termination URI. Use only the
hostname or IP address.
Adding a Custom SIP Trunk
Navigate to Phone Numbers
Go to the Phone Numbers section in your telli dashboard
Click Add Custom SIP Trunk
Click the Add Custom SIP Trunk button
Enter Configuration
Fill in your phone number and SIP credentials
Save and Test
Click Add SIP Trunk and test with a call
Provider Examples
Twilio Elastic SIP Trunking
Create Elastic SIP Trunk
Create a new Elastic SIP Trunk in Twilio Console
Note Termination URI
- US:
your-trunk.pstn.twilio.com - EU:
your-trunk.pstn.frankfurt.twilio.com
Create Credentials
Under Authentication > Credentials, create and note username/password
Add to telli
Enter the termination URI and credentials in telli
Telnyx
Create SIP Connection
Create a SIP connection in your Telnyx portal
Set up Credentials
Configure credential-based authentication
Add to telli
- Termination URI:
sip.telnyx.com
- Use your Telnyx credentials
