An arrangement and method for establishing and maintaining a connection between users' communication devices via a public data network. Communication devices belonging to users of a system are terminals of a telecommunication network, say mobile phones, and, in addition, they are adapted to a link to...http://www.google.fr/patents/US7711823?utm_source=gb-gplus-shareBrevet US7711823 - System for establishing and maintaining a connection
System for establishing and maintaining a connection
