T46S: Outlook contacts are called to email instead of telephone number

[primator]

Hi, we use the T46S with Skype for Business.
Users add Outlook contacts with an e-mail address and phone number as favorite in Skype for Busniess and therefor on the screen of the T46S.
The email address is not a skype address, and when called using the keys on the phone next to the screen, the contacts e-mail address is used for a call, and not the phone number.

I searched through the setting, but I cannot find any setting to change the order which is called first.

How can I change this behaviour?