Nowadays, networked electronic devices allow users to access services wherever they are. In an ubiquitous networks, clients notice the network to be everywhere and hence also ask networked services to be accessible everywhere. In such scenario, announcement and discovering of services are crucial. Currently, many service discovery protocols exist, however they are limited to a concrete network technology and most of them do not fit mobility and security requirements for a global and ubiquitous solution. In this paper the authors introduce a Multiprotocol Service Discovery solution for heterogeneous networks and describe their work for including security as a main design goal of the proposal.