---
page_type: error
code: 13430
message: "13430: Play: Invalid DTMF String"
level: WARNING
product: Programmable Voice
---

## Description

The `digit` attribute may contain numbers, the `#` and `*` characters, the letters `A`, `B`, `C`, `D`, as well as lowercase `w` to "wait" for half a second or uppercase `W` to "wait" for a full second.

### Possible Causes

The attribute `digit` includes an invalid character.

### Possible Solutions

Ensure the `digit` attribute only contains the characters: `0123456789ABCD*#wW`.