---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/32216#article
headline: "32216: SIP: SIP Address is on a deny list"
url: https://www.twilio.com/docs/api/errors/32216
inLanguage: en
dateModified: 2026-06-09T11:00:42.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 32216: SIP: SIP Address is on a deny list

Log Type: APPLICATION

Log Level: ERROR

## Description

You receive this error when the SIP address you are trying to reach is on a deny list. When you dial a SIP endpoint, send a valid SIP URI in the `To` parameter or inside the `<Sip>` noun.

### Possible causes

* The SIP address or SIP URI you supplied is on a deny list.
* You passed the denied destination in the REST API `To` parameter for a SIP call.
* You passed the denied destination in the `<Sip>` noun in your TwiML.
* In some cases, the SIP URI points to a different destination than you intended, such as an outdated user or SIP Domain value. Twilio SIP Domains use specific domain and registration formats.

### Possible solutions

* Replace the destination with a SIP URI that is not on a deny list.
* Review the exact value you send in the REST API `To` parameter and confirm it is the SIP URI you intend to reach.
* If you use TwiML, review the `<Sip>` noun and confirm it contains the correct SIP URI.
* If you use a Twilio SIP Domain, verify that you are using the correct SIP Domain format and the intended registered endpoint before you retry the call.

#### Additional resources

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