A communications system includes a caller device, a receiver device, and a communications device. The communications device includes a storage unit, a communications unit, and a processing unit. Each called party is assigned an identifier, and has one or more receiver device. Each receiver device is assigned a phone number. The storage unit stores a phone number of each receiver device associated with a called party. The processing unit includes a request receiving module for receiving a request, a request recognition module for determining whether the identifier from the request matched one of the identifier of the called party; an acquiring module for acquiring the phone numbers of one called party when matching. The communications unit dials the acquired phone numbers to establish communications with the receiver device.