When your customer desires to contact your "Customer Service Center" they simply click on "Customer Service" Call Button banner which is located on your website. It will make the call from callers PC to your office automatically. It works just like international toll free numbers. User uses IN-Call Button does require IN-Call Gateway in order to make free calls. Users in US can make calls through IN-Call Button without IN-Call Gateway by using DSG's Gateway in US with discount calling rates.