Disconnection monitoring terminating device and disconnection monitoring method

A disconnection monitoring method executed by a disconnection monitoring termination apparatus, the disconnection monitoring termination apparatus operable to be connected between a first network configured to monitor for inability to communicate real time transport protocol (RTP) packets in a second network by using a disconnection monitoring timer and the second network configured to accommodate terminals that do not send a hold signal, the disconnection monitoring method comprising:

• storing a value of a disconnection monitoring timer for second network monitoring used for monitoring for the inability to communicate the RTP packets in the second network, in a disconnection monitoring timer storage unit;
• setting the value of the disconnection monitoring timer for second network monitoring to a value smaller than a value of the disconnection monitoring timer of the first network;
• controlling a signal transmitted and received between the first network and the second network;
• and
• monitoring, by an RTP disconnection monitoring unit implemented in the disconnection monitoring termination apparatus, for the inability to communicate the RTP packets in the second network, by using the disconnection monitoring timer for second network monitoring,
• wherein, while controlling the signal, based on the RTP disconnection monitoring unit detecting inability to communicate the RTP packets in the second network, a request including a session description protocol (SDP) offer in which a direction attribute of receive only set is sent to the first network.

A disconnection monitoring method executed by a disconnection monitoring termination apparatus, the disconnection monitoring termination apparatus operable to be connected between a first network and a second network that are respectively configured to monitor for inability to communicate real time transport protocol (RTP) packets in the second network or the first network by respectively using disconnection monitoring timers having different values, the disconnection monitoring method comprising:

• storing a value of a disconnection monitoring timer held by the first network and a value of a disconnection monitoring timer held by the second network, in a network disconnection monitoring timer storage unit;
• storing a value of a disconnection monitoring timer for monitoring both networks used for monitoring for inability to communicate RTP packets in both networks of the first network and the second network, in a disconnection monitoring timer storage unit;
• setting the value of the disconnection monitoring timer for monitoring both networks to a value smaller than the value of the disconnection monitoring timer held by the first network and the value of the disconnection monitoring timer held by the second network;
• controlling a signal transmitted and received between the first network and the second network;
• and
• monitoring for the inability to communicate the RTP packets in each of the first network and the second network, by using the disconnection monitoring timer for monitoring both networks,
• wherein, while controlling the signal, based on the disconnection monitoring termination apparatus detecting the inability to communicate RTP packets in one network having a larger value of the disconnection monitoring timer among the first network and the second network, a request in which a direction attribute of receive only is set is sent to the other network.