Communication quality monitoring device, communication system, communication quality monitoring method and program thereof

A communication system including a communication device which executes communication by a session control protocol and a communication quality monitoring device which is connected to the communication device through a communication network to detect deterioration in communication quality based on a buffer length of the session control protocol, wherein said communication quality monitoring device comprising:

• a threshold value calculating unit which calculates a threshold value for the determination of deterioration in communication quality according to a parameter related to congestion detection of said session control protocol;
• and
• a deterioration determining unit which determines deterioration in communication quality by comparing said threshold value and the buffer length.

A communication quality monitoring method of detecting deterioration in communication quality based on a buffer length of a session control protocol, comprising:

• a threshold value calculating step of calculating a threshold value for the determination of deterioration in communication quality according to a parameter related to congestion detection of said session control protocol;
• and
• a deterioration determining step of determining deterioration in communication quality by comparing said threshold value and the buffer length.

A non-transitory computer-readable medium storing a communication quality monitoring program to be executed on a computer device which detects deterioration in communication quality based on a buffer length of a session control protocol, which communication quality monitoring program causes said computer device to execute

• a threshold value calculating processing of calculating a threshold value for the determination of deterioration in communication quality according to a parameter related to congestion detection of said session control protocol, and
• a deterioration determining processing of determining deterioration in communication quality by comparing said threshold value and the buffer length.