Network quality monitoring device and method for internet services involving signaling

A network quality monitoring device operated on an IP network in which communication is performed based on an Internet protocol and monitoring network quality in an Internet service whose communication state is controlled based on a signaling protocol, the network quality monitoring device comprising:

• a packet receiving unit that receives packets used by a signaling protocol server device, which is a server device for processing the signaling protocol and which receives a request from a client to communicate with the IP network;
• a signaling protocol packet extracting unit that extracts signaling protocol packets for controlling the signaling protocol from packets received by the packet receiving unit;
• a signaling protocol packet analyzing unit that analyzes the signaling protocol packets for establishing a communication session, which are extracted by the signaling protocol packet extracting unit and which are transmitted and received by the signaling protocol server device respectively at an ingress and an egress, in order to associate signaling protocol information obtained from the signaling protocol packets and session states for each session and for each of the ingress and the egress, and manage the associated signaling protocol information and the session states as session management tables while managing transitions of the session states;
• a session management table storing unit that stores the session management tables;
• a signaling protocol quality analyzing unit that collects quality information regarding the network quality from session management tables corresponding to sessions that have transitioned to a predetermined communication state among the session management tables stored in the session management table storing unit and, based on the collection result, analyzes statistical information regarding the network quality;
• and
• a statistical information notifying unit that notifies the quality information and the statistical information obtained at the signaling protocol quality analyzing unit.