In order to track call data from banner advertisements you need to add additional code to the referral URL link placed on the banner.
The additional code is ?utm_plasource=banner
Therefore for example if the URL is www.mylandingpage.com/business/abn.html
Then the URL will be www.mylandingpage.com/business/abn.html?utm_plasource=banner
Additionally, if you also want to name the banner, then you need to add additional information, such as
www.mylandingpage.com/business/abn.html?utm_plasource=bannername