Patent ID: 9699763
Date: 2017-07-04
CPC Classifications: H04M,H04W

Claim:
1. A method in a mobile terminal of receiving a circuit-switched (CS) voice call when the mobile terminal is operating in a packet-switched-only wireless telecommunication network, said method comprising: receiving a paging request message from the packet-switched-only network; determining whether the paging request message is an invitation to participate in a data session in the packet-switched-only network, or is an invitation to accept an incoming CS voice call through a Mobile Switching Center/Visitor Location Register (MSC/VLR); upon determining that the paging request message is an invitation to participate in a data session in the packet-switched-only network, utilizing a packet-switched communication protocol stack in the mobile terminal to transmit a response to a control node in the packet-switched-only network; and upon determining that the paging request message is an invitation to accept an incoming CS voice call, utilizing a circuit-switched communication protocol stack in the mobile terminal to transmit a response directly to the MSC/VLR, wherein utilizing a circuit-switched communication protocol stack in the mobile terminal to transmit a response directly to the MSC/VLR includes: