VoipNow Desktop uses the VoipNow Call API in order to connect with the VoipNow Professional server. Call API access can be enabled
for each account in VoipNow, so you can grant access to certain customers only.
In the picture below you can see how VoipNow Browser Module (a component of VoipNow Desktop) converts a regular
webpage, enabling click to call on phone numbers.
For more details on how to activate Call API for a VoipNow Professional account, you should
read this article.