Real-time multimedia applications, such as video on demand, use the
communication subsystem in different ways than traditional applications
such as file transfer or electronic mail do. Obviously, the prevailing
service model of the Internet---the best-effort, point-to-point delivery
service of IP---does not reflect the needs of continuous media
transmission. The special needs of real-time--multimedia network traffic
that also led to the proposed Integrated Services extensions for the
Internet architecture (see Section 
), will be considered in the
remainder of Section .