Inserting phone link in person screen

SOLVED

Hi,

I would like to add the link <a href="tel:..." </a> to the displayed phone number on the person screen in order dial the number using an external application.

I cannot use the CTI option in the users details since the app has no cti drivers installed locally.

Is there any possibility to add this link using screen customisation or any other change?

Thank you for helping

Samuel