IP-based networks for corporate and public network have been growing widely in recent years along with remarkable advances in the devices making up the IP-based network infrastructure. Recently a great deal of attention is being focused on using VoIP (Voice over IP) for a wide range of real-time streaming IP services and the VoIP traffic to be a promising traffic over IP-based networks. This paper describes schemes for efficiently transporting voice signals over IP-based networks in order to provide VoIP services. While taking the requirements for these schemes into account this paper provides IP-based circuit-multiplexing techniques for carrying voices calls over IP-based networks and evaluates the voice quality of those schemes.
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