Call control system, terminal device, call control apparatus, method and program

A call control device for controlling a call between a terminal device and another terminal device, the call control device comprising:

• one or more processors;
• and
• one or more storage devices storing instructions that when executed by the one or more processors, cause the one or more processors to perform operations comprising:
• collecting, from a plurality of SIP packets related to the call that are transmitted and received between the terminal device and the other terminal device, identification information of a plurality of devices and networks through which the plurality of SIP packets are routed, acquiring information about RTP packets related to the call from call disconnection SIP packets transmitted from the terminal device, and storing identification information groups related to the plurality of pieces of identification information that have been collected and the information about the RTP packets in association with each other in a storage unit, for each call;
• identifying a problem-occurring call using the information about the RTP packets, and extracting, from the storage unit, a plurality of identification information groups corresponding to a plurality of calls communicating in the same time slot as the problem-occurring call;
• and
• determining a faulty portion based on a bias in a quantitative trend of each of the devices, or each of the networks, using the plurality of identification information groups.

A call control method that is performed by a terminal device configured to transmit a signal of a call to another terminal device and a call control device configured to control the call between the terminal device and the other terminal device,

• the terminal device performing the steps of:
• collecting information about RTP packets related to the call;
• and transmitting the information about the RTP packets to the call control device in a state in which the information about the RTP packets is contained in call disconnection SIP packets related to the call, and
• the call control device performing the steps of:
• collecting, from a plurality of SIP packets related to the call that are transmitted and received between the terminal device and the other terminal device, identification information of a plurality of devices and networks through which the plurality of SIP packets are routed, also acquiring the information about the RTP packets from the call disconnection SIP packets, and storing identification information groups related to the plurality of pieces of identification information that have been collected and the information about the RTP packets in association with each other in a storage unit, for each call;
• identifying a problem-occurring call using the information about the RTP packets, and extracting, from the storage unit, a plurality of identification information groups corresponding to a plurality of calls communicating in the same time slot as the problem-occurring call;
• and
• determining a faulty portion based on a bias in a quantitative trend of each of the devices, or each of the networks, using the plurality of identification information groups.