Skip to main content

​
Overview

Import Telnyx numbers using SIP trunking. This guide walks through FQDN-based trunk setup.

​
Step-by-Step Setup

1

Create SIP Connection

Log in to Telnyx → SIP Connections → Create SIP Connection. Choose FQDN as trunk type.
2

Configure FQDN

In the FQDNs section under Authentication and Routing:
  • Add FQDN: 5t4n6j0wnrl.sip.livekit.cloud
  • Set DNS record type to SRV
3

Set Up Outbound Authentication

Under Outbound Calls Authentication:
  • Choose Credentials as method
  • Set a username and password (save these for later)
4

Configure Inbound Settings

  • Allow inbound calls in +E.164 format (critical — wrong format causes inbound failures)
  • Choose codecs: G722, G729, and OPUS
  • Select the region closest to you
5

Configure Outbound Settings

Create a new Outbound Voice Profile and select it in the dropdown.
6

Import to Assistable

Gather your raw phone number, SIP username, password, and URI (sip.telnyx.com), then import in the Assistable dashboard.
Double-check that the inbound format is set to +E.164 and the outbound URI is correct — incorrect values are the most common cause of call failures.

​
Troubleshooting

If calls aren’t working, verify all steps above are done correctly. Assistable stores the SIP info you provide to build the SIP packet — whether calls connect depends on your Telnyx configuration. Contact Telnyx support for provider-side issues.