13249: Dial: Invalid username or password attribute

Twilio returns this warning when the username or password attribute on the <Dial> noun is invalid. This usually happens when you use <Sip> with missing, malformed, or unsupported authentication credentials.

• The <Sip> noun inside <Dial> includes an empty username or password attribute
• The username or password attribute contains an invalid value
• You provided authentication attributes in a format that Twilio cannot use for SIP authentication
• The generated TwiML includes a typo in the username or password attribute name or value

• Review the <Dial> and <Sip> TwiML you return and confirm the username and password attributes are present only when needed
• Make sure both credentials are valid for the SIP endpoint you are dialing
• Verify the credentials do not contain unintended empty strings, template errors, or malformed characters
• Validate your TwiML against the <Dial> noun and <Sip> noun documentation and correct any invalid attributes before returning the response
• If you generate TwiML dynamically, log the final XML and inspect the values passed to username and password

• TwiML Voice <Dial> noun
• TwiML Voice <Sip> noun
• TwiML for Voice