Patent ID: 8532630

Claim:
A method for call control, comprising: sending from a call control manager a first message using an Unstructured Supplementary Service Data (USSD) protocol to a first device, wherein the first message alerts the first device of an incoming call from at least one second device and includes a first set of call options and call initiator information; receiving a first response message from said first device responsive of said first message; and, when the first response includes an instruction for accepting said call with at least one second device, exchanging USSD messages, during said call established between the at least one second device and the first device, between said call control manager and said first device and between the first device and the at least one second device through the call control manager, said USSD messages containing selection lists including a second set of call options sent to said first device from said call control manager and responses thereof received from said first device; sending a barge-in call control message from said call control manager to said first device during a call in progress.