IP-telephony Zadarma - a network of telephone communications through the Internet. In it, calls do not depend on city or mobile telephone networks. Call from anywhere in the world and from any device connected to the Internet: computer, mobile, IP-phone or office mini-ats. Zadarma integrates with the OneBox system and gives you free audio and video calls within the network, your own phone number, available calls to phones of any country. And OneBox automates business-related business processes.