---
page_type: error
code: 31210
message: "31210: Call Message Event Type is invalid."
level: ERROR
product: Programmable Voice
---

## Description

The Message Type used for sending Call Message Event is invalid. Please see Twilio's [Voice SDK Call Message Events Documentation](/docs/voice/sdks/call-message-events/) for more information on valid Message Type.

### Possible Causes

The Message Type used for sending Call Message Event is invalid.

### Possible Solutions

- Verify that Message Type being sent with Call Message Event is a value supported by Twilio Programmable Voice
- Use one of the [supported Message Types](/docs/voice/sdks/call-message-events/) to call a Twilio function.