# 13222: Dial->Number: Invalid sendDigits value

Log Type: APPLICATION

Log Level: WARNING

## Description

The `sendDigits` 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. See the [Dial Verb](/docs/voice/twiml/dial) API Reference for more information.

### Possible causes

The attribute `sendDigits` includes an invalid character.

### Possible solutions

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