Patent ID: 8160058

Claim:
A method for signaling a voice over Internet protocol (VoIP) call based on a class of VoIP service in a VoIP service system, the method comprising: storing VoIP signaling information in a database, the VoIP signaling information comprising a Quality of Service (QoS) factor being differentiated by a class of VoIP service; producing a call setup message by referring to the database using a service class assignment condition, the call setup message comprising the QoS factor associated with the class of VoIP service; and processing and transmitting, to a correspondent, the produced call setup message with VoIP signaling information comprising the QoS factor corresponding to the class of VoIP service, wherein the QoS factor is set differently for the call setup message and for a response message received from the correspondent in response to the call setup message, and wherein producing the call setup message comprises: determining the class of VoIP service corresponding to the call setup message to be produced; assigning a service class to the determined class of VoIP service, the service class being classified by one of a user policy and a VoIP operation policy; and producing the call setup message comprising the QoS factor associated with the assigned class of VoIP service.