32223: There is no username in the SIP URI when calling a SIP registered endpoint

Twilio only routes a call to a registered SIP endpoint when you use the endpoint's full Address of Record, such as username@yourdomain.sip.twilio.com. Calling the SIP Domain by itself, such as yourdomain.sip.twilio.com, is not supported for this call flow.

• You attempted to call a registered SIP endpoint without the username portion of the SIP URI.
• You used the SIP Domain by itself instead of the full registered endpoint AOR, such as username@yourdomain.sip.twilio.com.
• You attempted to place a SIP call from Twilio to a Twilio SIP Domain instead of to a registered SIP endpoint. Twilio does not allow SIP calls between Twilio SIP Domains.

• Update the destination SIP URI to include the registered endpoint username, such as username@yourdomain.sip.twilio.com.
• Verify that the username matches the credential configured for SIP Registration on that SIP Domain.
• If you are placing the call with the REST API or with <Dial><Sip>, pass the full SIP URI for the registered endpoint instead of the bare domain.

• SIP Registration
• Outbound - Receiving SIP from Twilio
• TwiML Voice: <Sip>