Toll-free Missed Call Service works on a missed call concept i.e. customers gives a missed call on a specific number assigned for a company than our system captures that detail and send an acknowledgement SMS to the caller. One Ring is a cloud-based telephony platform widely used for call-back service, voting and mobile verification service by just a missed call. Missed Call service is a completely automated web based application enables you to get the real time notifications of all calls on your dedicated Mobile/Land Phone/Toll Free Number.