Abstract: A network that is to execute transcoding is fixed. IMS networks (SBC 1a and SBC 1b) set an information element that requests either of the IMS networks to execute transcoding into the SDP, and use that information element to select the IMS network (SBC 1a or SBC 1b) that is to execute transcoding between the IMS networks (between SBC 1a and SBC 1b). Then, the selected IMS network executes transcoding of media data.

Abstract: A network that is to execute transcoding is fixed. IMS networks (SBC 1a and SBC 1b) set an information element that requests either of the IMS networks to execute transcoding into the SDP, and use that information element to select the IMS network (SBC 1a or SBC 1b) that is to execute transcoding between the IMS networks (between SBC 1a and SBC 1b). Then, the selected IMS network executes transcoding of media data.

Abstract: A network that is to execute transcoding is fixed. IMS networks (SBC 1a and SBC 1b) set an information element that requests either of the IMS networks to execute transcoding into the SDP, and use that information element to select the IMS network (SBC 1a or SBC 1b) that is to execute transcoding between the IMS networks (between SBC 1a and SBC 1b). Then, the selected IMS network executes transcoding of media data.

Abstract: It is possible to appropriately avoid erroneous call disconnection between interconnected networks at a low cost without modifying an apparatus in the network. A disconnection monitoring termination apparatus 1 is connected between a first network 100 for monitoring for inability to communicate RTP packets in a second network 200 by using a disconnection monitoring timer and the second network for accommodating terminals that do not send a hold signal, monitors for the inability to communicate the RTP packets in the second network 200 by using the disconnection monitoring timer for second network monitoring having a value smaller than a value of the disconnection monitoring timer of the first network 100, and when detecting the inability to communicate the RTP packets in the second network 200, the disconnection monitoring termination apparatus 1 sends an UPDATE request or a re-INVITE request including an SDP offer in which a direction attribute of “a=recvonly” is set, to the first network 100.

Abstract: An SIP proxy server 1 includes a forking termination unit 21. The forking termination unit 21 is configured to: in response to receiving an Initial INVITE request message from a originating-side network 6, transmit the Initial INVITE request message to an incoming-side network 7, and in response to receiving an 18X response message at the first time from the incoming-side network, transmit the 18X response message received at the first time to the originating-side network 6. The forking termination unit 21 establishes Early dialog #0 between the SIP proxy server and the originating-side network 6 and establishes Early Dialog #1 that is compatible with an incoming-side terminal 3 that is a transmission source of an 18X response message received at the first time.

Abstract: It is possible to appropriately avoid erroneous call disconnection between interconnected networks at a low cost without modifying an apparatus in the network. A disconnection monitoring termination apparatus 1 is connected between a first network 100 for monitoring for inability to communicate RTP packets in a second network 200 by using a disconnection monitoring timer and the second network for accommodating terminals that do not send a hold signal, monitors for the inability to communicate the RTP packets in the second network 200 by using the disconnection monitoring timer for second network monitoring having a value smaller than a value of the disconnection monitoring timer of the first network 100, and when detecting the inability to communicate the RTP packets in the second network 200, the disconnection monitoring termination apparatus 1 sends an UPDATE request or a re-INVITE request including an SDP offer in which a direction attribute of “a=recvonly” is set, to the first network 100.

Abstract: A network that is to execute transcoding is fixed. IMS networks (SBC 1a and SBC 1b) set an information element that requests either of the IMS networks to execute transcoding into the SDP, and use that information element to select the IMS network (SBC 1a or SBC 1b) that is to execute transcoding between the IMS networks (between SBC 1a and SBC 1b). Then, the selected IMS network executes transcoding of media data.

Abstract: An SIP proxy server 1 includes a forking termination unit 21. The forking termination unit 21 is configured to: in response to receiving an Initial INVITE request message from a originating-side network 6, transmit the Initial INVITE request message to an incoming-side network 7, and in response to receiving an 18X response message at the first time from the incoming-side network, transmit the 18X response message received at the first time to the originating-side network 6. The forking termination unit 21 establishes Early dialog #0 between the SIP proxy server and the originating-side network 6 and establishes Early Dialog #1 that is compatible with an incoming-side terminal 3 that is a transmission source of an 18X response message received at the first time.

Abstract: A network that is to execute transcoding is fixed. IMS networks (SBC 1a and SBC 1b) set an information element that requests either of the IMS networks to execute transcoding into the SDP, and use that information element to select the IMS network (SBC 1a or SBC 1b) that is to execute transcoding between the IMS networks (between SBC 1a and SBC 1b). Then, the selected IMS network executes transcoding of media data.

Abstract: A network that is to execute transcoding is fixed. IMS networks (SBC 1a and SBC 1b) set an information element that requests either of the IMS networks to execute transcoding into the SDP, and use that information element to select the IMS network (SBC 1a or SBC 1b) that is to execute transcoding between the IMS networks (between SBC 1a and SBC 1b). Then, the selected IMS network executes transcoding of media data.