| 摘要 |
<p>Disclosed is a gateway apparatus that allows for interconnection between a communication terminal connected to a mobile circuit switched network and a partner terminal mediated by a mobile IMS network to implement voice telephony. The gateway apparatus arranged between the mobile circuit switched network and the mobile IMS network, includes a conversion unit 151 which converts a control signal output from the mobile circuit switched network into at least one of SIP and SDP to output a signal converted to the mobile IMS network and which receives a line switching protocol for audio output from the mobile circuit switched network. The conversion unit decides, using at least one of SIP and SDP, output from the mobile IMS network, on whether the partner terminal is to be connected via the mobile IMS network to the mobile circuit switched network, via the mobile IMS network to a fixed network or via the mobile IMS network to a mobile broadband network, then converts the line switching protocol received to a different protocol, depending on a result of the decision, and outputs the protocol converted to the mobile IMS network ( Fig.2 ).</p> |
