In order to realize the transmission of real-time data over IP networks, quality of service parameters for multimedia applications have been developed. Based on the Quality of Service (QoS) in graduated level, the Integrated Services (IntServ) and Differentiated Services
(DiffServ) have been created. IntServ is designed to transmit real-time applications more efficiently and with maximum possible performance
. To achieve this, the IntServ model assumed that available resources must be explicitly managed, that no service guarantees can be made without resource reservation, and that end-to-end delays are limited.According to the procedure, in IntServ, the host asks routers
Theswitching systems then establish the connection
with thedesired quality and maintain it until the end of the transmission. The concept provides for several priority classes that represent different QoS classes
. The IntServ model is described in RFC 1633.