Patent ID: 9204471
Filing Date: 2015-12-01
Classification: H04L,H04W

Abstract:
1. A method of establishing a circuit switched (CS) call to a mobile subscriber of a CS network, wherein the mobile subscriber comprises a CS client which is adapted to connect to a CS mobile network over a CS radio access and the mobile subscriber comprises an instant communication client which is adapted to communicate via an instant messaging protocol with an instant communication server, and wherein the instant communication server is associated to a hosting switching node of the CS network, the method comprises: receiving, by a switching node of the CS network, a CS setup message for terminating a CS call at the CS client of the mobile subscriber of the CS network; detecting, by the switching node of the CS network, that the mobile subscriber of the CS network is not reachable over the CS network; based on the detecting that the mobile subscriber of the CS network is not reachable over the CS network, routing the CS setup message to the hosting switching node that is associated to the instant communication server; forwarding the CS setup message to a message converter associated to the hosting switching node; converting, by the message converter associated to the hosting switching node, the CS setup message into a converted setup message according to the instant messaging protocol; forwarding the converted setup message to the instant communication server; and forwarding, by the instant communication server, the converted setup message to the instant communication client of the mobile subscriber of the CS network.