ActiveDEMAND automatically creates a webform for every static phone number that is NOT in a DNI pool (Assets->Web Forms). This can be exported and embedded into a website or accessed via a short code inside a WordPress site. The question is, what about a Landing Page? There is nothing special about the webform that is generated by ActiveDEMAND for each tracked number. You can easily replicate this in a Landing Page. The two elements that are required are a phone number form element and a 'call prospect' widget in the autoresponder.
Step 1: Create a landing page (Assets->Published Pages)
Step 2: Edit the form in the landing page (hover your mouse over the form, click the advanced edit pencil)
Step 3: Ensure the form has a Phone Number element and a Submit Button
Step 4: Remove the 'email prospect' action from the autoresponder (click the Auto Responder tab in the form editor)
Step 5: Drag over a 'Call Prospect' Action