# 13214: Dial: Invalid callerId value

Log Type: APPLICATION

Log Level: WARNING

## Description

### Dial: Invalid callerId value

callerId must be the calling number, called number, or a validated outgoing number. Additionally, if the calling leg is a client leg, the caller ID is required and must be a validated outgoing number. See the [Dial Verb](/docs/voice/twiml/dial#callerId) API Reference for more information.

### Possible causes

Carriers may send invalid Caller IDs on Incoming calls to Twilio. If a specific Caller ID is not explicitly defined on the `<Dial>` verb, the invalid Caller ID will be passed to the destination. This may cause some destination providers to reject the call, and Twilio will mark it as failed.

### Possible solutions

To work around this, your application should recognize invalid caller IDs, and substitute them with a valid Caller ID to construct the subsequent `<Dial>`.