Adopting SCTP and MPLS-TE mechanism in VoIP architecture for fault recovery and resource allocation

VoIP application allows us to transmit the voice data over Internet. In this paper, a VoIP architecture with fault recovery and resource allocation by adopting Multi-homed Stream Control Transmission Protocol (SCTP) and Multi-Protocol Label Switching Traffic Engineering (MPLS-TE) mechanism was proposed. In the proposed architecture, SCTP was employed to transmit SIP messages while MPLS-TE mechanism was applied to set up the voice data transmitting path. With the multi-homing capability of SCTP, the voice call failure rate could be reduced and network resources could be utilized efficiently. Through MPLS-TE mechanism, traffic engineering functions such as network resources optimization, strict quality of service (QoS) voice data delivery, and fast recovery upon link or node failures could be ensured. We simulate three architectures in the network simulator (NS2) software and compare them under different network conditions. The simulation results reveal that the applicability of the proposed architecture.