Mobile Ad hoc NETworks (MANETs) is a wireless network without any infrastructure, where each node act as router, transmitter and data sink. As various previous works have described that the performance of routing is highly dependent on the stability and availability of wireless links. With the development of the Internet services, Voice over IP (VoIP) has been participating a primary role in cutting the telephone calls costs. It can be viewed that since the demand of VoIP over wireless network is developing, utilization of VoIP over mobile ad-hoc network is required to develop as well.