Patent ID: 9667798
Date: 2017-05-30
CPC Classifications: H04L,H04M,H04W

Claim:
1. A method of registering an instant messaging client at an instant messaging server, wherein the instant messaging client is associated to a mobile terminal and wherein the instant messaging server is configured to use functions of a mobile switching node of a circuit switched network, the method comprising: initiating a connection between the instant messaging server that is configured to use the functions of the mobile switching node and the instant messaging client that is associated to the mobile terminal; receiving identification information at the instant messaging server from the instant messaging client via the connection; interrogating an authentication module of the mobile switching node to perform a user authentication by the instant messaging server; fetching subscriber information from a database by the instant messaging server; sending the subscriber information to the instant messaging client via the connection; receiving by the instant messaging server from the instant messaging client an instant message comprising a destination ID not registered at the instant messaging server; and forwarding the instant message by the instant messaging server to a destination instant messaging server, wherein at least one part of the identification information is stored in a Domain Name System, DNS, server in combination with an IP address of the instant messaging server, the DNS server being connected to the instant messaging server and the destination instant messaging server.