An apparatus, a system, and a method for obtaining a quality of service parameter of a voice over Internet Protocol (VoIP) service are presented. The apparatus obtains a quality of service parameter of a VoIP service, and the apparatus sends a quality parameter report of the VoIP service to a centralized processing device. The quality parameter report of the VoIP service includes the quality of service parameter of the VoIP service, such that a network system obtains quality of service of the VoIP service according to the quality of service parameter of the VoIP service, further helping an operator control and adjust the network system based on the quality of service of the VoIP service.