Patent ID: 9544756
Date: 2017-01-10
CPC Classifications: H04W

Claim:
1. A method for determining a home communication network of a user equipment roaming in a visited communication network, wherein the user equipment sends a session invitation to a further user equipment, the further user equipment being located in the visited communication network or a further communication network, the home communication network and the visited communication network being connected by a transit network, the method comprising: receiving, by a control node in the home communication network, the session invitation initiated by the visited communication network; adding, by the control node in the home communication network, an indication of the home communication network identity and an indication for session invitation loopback routing, to the session invitation, if the session invitation comprises a capability indicator for transit and roaming handling in the visited communication network; and sending, by the control node in the home communication network, the session invitation towards the visited communication network, wherein the session invitation comprises the indication of the home communication network identity and the indication for session invitation loopback routing.