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

Claim 14:
15. System for initiating a mobile voice call from a caller user equipment (UE) to a callee UE, which callee UE has 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 system comprises:
a software function, arranged to execute on or from the callee UE; and
a voice over internet protocol (VOIP) service arranged to accept circuit switch (CS) voice calls forwarded to a forwarding phone number from a first network to which the callee UE subscribes to the VOIP service,
wherein the software function is arranged to, when executing, automatically detect the callee phone number from said SIM card, and thereafter automatically to provide the VOIP service with the callee phone number and/or a receiving address comprising the callee phone number,
wherein the VOIP service is arranged to identify the callee UE based upon the forwarding phone number, and to, as a result of this identification, initiate the call between the caller UE and the said software function, using the receiving address, and
wherein the receiving address is a session initiation protocol (SIP) address in which the “user” field comprises the callee phone number.