The blacklist represents itself a list or register of entities which are denied privileges, service, mobility, access and admission due to these or other reasons. This function blocks all connections from the subscribers who are in the list.
Voice of IP of VoIP technology, is the one which completely changed the telecommunications market by transmitting voice over the Internet. During past several years it expanded in such a way that right now it covers each and every corner of the world and it became the new standard of telecommunication. Nowadays there are plenty of companies offering different kinds of services and devices.