32216: SIP: SIP Address is on a deny list

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.

• 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• In some cases, the SIP URI points to a different destination than you intended, such as an outdated user or SIP Domain value.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.

• 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.

• SIP overview
• TwiML Voice: <Sip>
• Making SIP Calls