The basic components of a network can be used in its enhancements through the provision of some reliable services. In order to achieve these provisions of reliable services, various technologies have been put in place. One of these technologies is MPLS and it provides Quality of Service and this is done by delivering such services with high transmission speed, low delays and low losses. Due to the ability to implement Traffic Engineering in MPLS, it can be used to efficiently implement real-time applications. Signaling protocols such as RSVP-TE and CR-LDP are used for Traffic Engineering in MPLS.In this paper, the modeling of IP, MPLS and MPLS RSVP-TE (with path reserved for voice traffic) networks are presented and the performance parameters of the networks are compared. OPNET modeler 16.0 is used to simulate all the networks and the comparison is made for parameters such as Voice packet delay variation, Video packet end-to-end delay variation and voice packet reception rate.