| 摘要 |
<p>The invention relates to a method of establishing a circuit switched, CS, call to a mobile subscriber (18) of a CS network, wherein the mobile subscriber (18) comprises an instant communication client (132, 78) which is adapted to communicate via an instant messaging protocol with an instant communication server (711), and wherein the instant communication server (711) is associated to a hosting switching node (71) of the CS network, the method comprises the following steps: - receiving, by a switching node (71, 90, 92) of the CS network, a CS setup message for terminating a CS call; - detecting, by a switching node (71, 90, 92) of the CS network, that the mobile subscriber (18) is not reachable over the CS network, - routing the CS setup message to the hosting switching node (71), - converting, by a message converter (714) associated to the hosting switching node (71), the CS setup message into a converted setup message according to the instant messaging protocol, - forwarding, by the instant communication server (711), the converted setup message to the instant communication client (132, 78).</p> |
