# 13220: Dial: Invalid ringTone value

Log Type: APPLICATION

Log Level: WARNING

## Description

This warning is returned when a `<Dial>` verb includes an invalid `ringTone` attribute value. The `ringTone` attribute lets you override the ringback tone Twilio plays to the caller while executing `<Dial>`.

### Possible causes

* The `<Dial>` verb included a `ringTone` value that does not match one of Twilio's accepted ringtone overrides.
* A custom ringtone override was supplied with a value outside the documented `ringTone` values for `<Dial>`.

### Possible solutions

* Update the `<Dial>` verb so `ringTone` is one of the accepted values for [ringTone](/docs/voice/twiml/dial#ringtone).
* If you do not need to override ringback, omit `ringTone`. When it is not specified, Twilio will play ringback or pass ringback from the carrier if one is provided.

#### Additional resources

* [TwiML for Programmable Voice](/docs/voice/twiml)