---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/13254#article
headline: "13254: Dial->Sip: SIP URI DNS does not resolve or resolves to an non-public IP address"
url: https://www.twilio.com/docs/api/errors/13254
inLanguage: en
dateModified: 2026-06-08T11:38:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 13254: Dial->Sip: SIP URI DNS does not resolve or resolves to an non-public IP address

Log Level: WARNING

## Description

Twilio returns this warning when you use `<Dial><Sip>` with a SIP URI whose host does not resolve in public DNS or resolves to a private or otherwise non-public IP address. Use a valid SIP URI that points to a publicly reachable SIP endpoint.

### Possible causes

* The domain in the SIP URI is missing, misspelled, or not published in public DNS.
* The DNS record for the SIP URI resolves to a private or internal IP address.
* The SIP endpoint is only reachable on an internal network and is not available through a public address.
* The SIP URI is invalid or the host portion of the URI is incorrect.

### Possible solutions

* Verify that the SIP URI is valid and that the host portion is correct.
* Check your DNS record and make sure the SIP URI resolves in public DNS.
* Update the DNS record so it resolves to a publicly routable IP address.
* Use a specific public IP address in the SIP URI if you do not want to use a domain.
* If your endpoint does not have a fixed public address, use SIP Registration so Twilio can route calls to the registered endpoint.

#### Additional resources

* [TwiML `<Sip>`](/docs/voice/twiml/sip)
* [SIP Registration](/docs/voice/api/sip-registration)
* [Use SIP with Twilio Voice](/docs/voice/api/sip-interface)