Patent ID: 11909777
Assignee: WONE SAGL
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. Method for initiating a mobile voice call from a caller user equipment (UE) to a callee UE, having a subscriber identity module (SIM) card associated with a callee phone number, which callee phone number is a E.164 compliant Mobile Station International Subscriber Directory Number (MSISDN) of the SIM card, which method comprises the following steps, performed ahead of the said call initiating:
a) providing a software function arranged to execute on or from the callee UE, which software function is associated with a receiving address, which receiving address comprises the said callee phone number; and
b) configuring a call forwarding function in a first network to which the callee UE subscribes, which call forwarding function is activated for the said callee phone number and configured for forwarding circuit switch (CS) voice calls to a forwarding phone number associated with a voice over internet protocol VOIP service, and wherein the method further comprises the following steps, performed in connection to the said call initiating:
c) the caller UE calling the callee phone number;
d) the first network performing said call forwarding, forwarding the call to said VOIP service using said forwarding phone number;
e) the VOIP service identifying the callee UE based upon the forwarding phone number; and
f) the VOIP service initiating the call between the caller UE and the said software function, using the receiving address,
wherein the receiving address is a session initiation protocol (SIP) address in which the “user” field comprises the callee phone number.