Patent ID: 8873545
Filing Date: 2014-10-28
Classification: H04L,H04W

Abstract:
1. A gateway apparatus that connects an access point to a preset node on a mobile circuit switched network to perform mutual communication, said gateway apparatus comprising a conversion section that receives at least one of a call control signal and a packet that has voice data stored therein in a predetermined protocol or payload format from said access point, and converts at least one of a protocol of said call control signal and a protocol or a payload format of said packet into a protocol being same as a circuit switched protocol which is used when a radio network controller (RNC) on said mobile circuit switched network connects to said preset node, for output to said preset node, said conversion section receiving at least one of a call processing signal that uses a protocol being same as a protocol which is used when said preset node outputs to said radio network controller, and a voice signal that uses said same protocol, and converting at least one protocol of said call processing signal and said voice signal received, for output to said access point, wherein the preset node includes a second gateway apparatus that interconnects the mobile circuit switched network and an IMS (IP Multimedia Subsystem) network, wherein the gateway apparatus and the second gateway apparatus interconnect a terminal connected to the access point and a terminal connected to the IMS network, wherein, when no conversion is needed, the conversion section is configured to receive a circuit switching protocol frame, which is a circuit switched protocol, from the second gateway apparatus and to place the circuit switching protocol frame on an Realtime Transport Protocol/User Datagram Protocol (RTP/UDP) packet, and wherein, when conversion is needed, the conversion section is further configured to receive conversion instructions on a per channel bases, to convert the circuit switching protocol frame into a Realtime Transport Protocol (RTP) payload format by reading a compression-encoded audio bit stream stored in an Radio Access Bearer (RAB) SubFlow of the payload of an IuUP protocol frame, to construct an RTP payload format header on a per channel basis according to the conversion information, and to store the compression-encoded bit stream in an RTP payload portion.