Once your data is sent to Calltools, you want one contact with one phone number. For example, in REISift if you have a contact with three phone numbers, it is going to create three individual contacts so you can call through them and and send your records back to REISift with Zapier. If you are on our Business Plan, Calltools will automatically send records back to REISift (correct number, wrong number, etc) and update your data in real time.