13120: Annotate->BillingReferenceTag cannot be over 128 characters

Twilio returns this error when your Voice TwiML includes a BillingReferenceTag value longer than 128 characters. Twilio parses and executes the TwiML your application returns for a voice call. If Twilio cannot process that request because the TwiML is invalid, Twilio logs the event as an error.

• The BillingReferenceTag value in your Annotate instruction is longer than 128 characters.
• Your webhook returned TwiML that Twilio could not process because the BillingReferenceTag value exceeded the allowed limit.

• Shorten the BillingReferenceTag value so it is 128 characters or fewer before you return the TwiML response.
• Review the TwiML your application generates and make sure the BillingReferenceTag value stays within the allowed length every time you build the response.
• Check the Twilio Debugger for the failed request and inspect the returned TwiML so you can correct the invalid value.
• Open the webhook URL in your browser or test client and verify that the response does not include an oversized BillingReferenceTag.

• TwiML for Programmable Voice
• Twilio Debugger
• Programmable Voice