You have the option of sending your visitor to the advertiser's website directly, or to a 'Landing Page' you create that gives the visitor the concise information catered to promoting them to contact the advertiser.
Creating a Landing Page is the best option as you can give the visitor the advertiser's contact information and give them an action to do.
Directing your visitor simply to their website might not provide them with the right action to take to contact the advertiser.
The best alternative is to embed the advertiser's website into your website and add an action on your website page of what the visitor should do. Here's an example.
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