Performance Evaluation of Sip-Based Session Establishment Over DSR-Routed Manets

It is highly desired to support real-time multimedia session services in a mobile ad hoc network (MANET). The standard protocol published by IETF for setting up multimedia session applications in a fixed IP network is the session initiation protocol (SIP). However, SIP-based services depend on the SIP overlay infrastructure. MANETs being lack of any such infrastructure, require auxiliary mechanisms to support such services. The main contribution of this paper is that we propose an integrated SIP-based session establishment mechanism with extensions of the dynamic source routing (DSR) protocol over MANETs through effectively applying the cross-layer design between the networking routing protocol and the application layer SIP methods. In addition, we present that it is not necessary for SIP over MANETs to use via header field any more. Our simulation results show that the proposed mechanism offers superior performances when compared to the SIP MANETs running on the normal DSR