Abstract
The implementation of the SIP-based Voice over IP (VoIP) and multimedia over MANET is still a challenging issue as many routing factors affect the SIP signaling performance and the voice Quality of Service (QoS). The nodes' mobility in MANET cause dynamic changes on the route calculations, topology, hop numbers, and the connectivity status between the correspondent nodes. The SIP-based VoIP depends on the caller’s registration, call initiation, and call termination processes. Therefore, the SIP signaling performance has an important role for the overall QoS of SIP-based VoIP applications over IPv4 and IPv6 MANET. The SIP end-to-end performance metrics have been defined in RFC 6076 to provide a standardized method of evaluation for the performance of the SIP signaling system over different platforms. However, no benchmarked values for these metrics have been proposed yet. In this thesis, an evaluation studies for the performance of the SIP signaling system over the AODV-based and OLSR-based MANET introduced using various mobility models. The related SIP end-to-end performance metrics were employed for the performance investigations and enhancement efforts for the SIP signaling system. The evaluation study was used to benchmark the related performance metrics for the SIP signaling system in general. In addition, the study evaluated the implementations of the ROHC-based system over IPv6 MANET for SIP-based VoIP. Furthermore, novel Cross-Layer performance enhancement approaches are proposed, implemented, and evaluated to improve the performance of the SIP signaling system over MANET based on simple dynamic modifications for the routing parameters. The SIP performance metrics reflect the SIP signaling state and the required actions for the routing parameters. The implementation of the Cross-Layer approaches succeeded in reducing the total delays in the SIP processes, enhanced the signaling performance, and increased the utilisation level in the system bandwidth and routing processes.