US Patent 10284606 Setting up communication between a web application and a terminal

A method and apparatus are provided for setting up a communications session between an instance of a web application installed in a terminal and a called entity. The method includes sending a first request for setting up a communications session between the application instance and the called entity, the first request being formulated in a first protocol; receiving a response indicating that it is not possible to route the first request, and sending a second request for setting up the communications session formulated in a second protocol.