CallME! Click-to-Call is web-based calling service. Users create accounts linked to their phone numbers and can manage incoming and outgoing telephony functions. Click-to-Call can be used as a long distance calling service, or can regulate operational hours for phone calls made from a userâ€™s website. They provide a RESTful API that exposes the Click-to-Callâ€™s essentially telephony functions as well as data retrieval.