Voiper is the future of telephony, a local Australian company. Voiper provides low cost International Calling and calling card for internet calls worldwide. Make international calls through USB phone, soft phone or any mobile device with SIP capabilities. Voiper is the future of telephony, a local Australian company. Voiper provides low cost International Calling and calling card for internet calls worldwide. Make international calls through USB phone, soft phone or any mobile device with SIP capabilities.