# 21205: Invalid URL

Log Level: ERROR

## Description

You attempted to initiate an outbound phone call, but the URL you specified to handle the call was not a valid URL.

If you specified an Application Sid for your outbound phone call, the application must have a valid VoiceUrl or the call will fail.

### Possible solutions

Make sure you submit a fully qualified URL including:

* protocol (http:// or https://)
* hostname
* file path
* properly url-encoded query parameters

Twilio must be able to reach this URL over the public Internet.