Congestion control method, congestion control device, and congestion control program

A non-transitory computer recording medium storing a congestion control program, wherein execution of the congestion control program causes one or more computers to perform operations comprising:

• acquiring a number of established simultaneous calls on a first line shared by a plurality of IP telephones;
• acquiring lengths of call duration of respective calls among the established simultaneous calls;
• and
• setting communication parameters that (i) contribute to communication quality of the respective calls among the established simultaneous calls and (ii) are different from a packet discard ratio based on the number of established simultaneous calls and the lengths of call duration,
• wherein the call duration of a first established call among the established simultaneous calls is longer than the call duration of a second established call among the established simultaneous calls, and
• wherein setting the communication parameters comprises setting the communication parameters such that the communication quality is deteriorated more as the length of the call duration increases based on the number of simultaneous established calls exceeding a threshold value, including setting the communication parameters of the first established call having the longer duration than the second established call such that a first value indicating the communication quality of the first established call is more deteriorated than the communication quality of the second established call as indicated by a second value.

A congestion control device in an Internet protocol (IP) telephone system, comprising:

• an information processing device, implemented using one or more computing devices, and configured to perform:
• acquiring a number of established simultaneous calls on a first line shared by a plurality of IP telephones;
• acquiring lengths of call duration of respective calls among the established simultaneous calls;
• and
• setting communication parameters that (i) contribute to communication quality of the respective calls among the established simultaneous calls and (ii) are different from a packet discard ratio based on the number of established simultaneous calls and the lengths of call duration,
• wherein the call duration of a first established call among the established simultaneous calls is longer than the call duration of a second established call among the established simultaneous calls, and
• wherein setting the communication parameters comprises setting the communication parameters such that the communication quality is deteriorated more as the length of the call duration increases based on the number of simultaneous established calls exceeding a threshold value, including setting the communication parameters of the first established call having the longer duration than the second established call such that a first value indicating the communication quality of the first established call is more deteriorated than the communication quality of the second established call as indicated by a second value.