---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/13244#article
headline: "13244: Dial: No SIP Authorization"
url: https://www.twilio.com/docs/api/errors/13244
inLanguage: en
dateModified: 2026-06-08T11:38:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 13244: Dial: No SIP Authorization

Log Level: WARNING

## Description

This warning is returned when you try to place a SIP call with `<Dial><Sip>` or the Calls API from an account that is not authorized to use SIP calling.

### Possible causes

* You attempted to dial a SIP URI with `<Dial><Sip>` from an account that does not have SIP calling access.
* You attempted to create an outbound SIP call with the Calls API by setting the `To` parameter to a SIP URI on an account that is not enabled for SIP.

### Possible solutions

* Place the SIP call from a Twilio account that has SIP calling enabled.
* Review your SIP call flow and retry with the supported Programmable Voice SIP configuration after SIP access is available.
* If the destination SIP endpoint requires authentication, pass valid credentials by using the `<Sip>` `username` and `password` attributes or the Calls API `SipAuthUsername` and `SipAuthPassword` parameters.

#### Additional resources

* [TwiML Voice: `<Sip>`](/docs/voice/twiml/sip)
* [Making SIP Calls](/docs/voice/api/sip-making-calls)
* [Use SIP with Twilio Voice](/docs/voice/api/sip-interface)