Modem traffic over a hybrid of switched and packet type networks has become a feature needed in nowadays' Gateway systems. Since August 2000, intensive standardization work has been devoted to the development of the Modem over IP (MoIP) standard. This effort culminated in the recent publication of the V.150.0 and V.150.1 ITU standards. Other protocols, such as H.323 call setup have been adjusted to enable MoIP calls over hybrid PSTN-IP networks. In this paper, the V.150 MoIP protocol is introduced. The related network configuration is described. In addition, various aspects of the MoIP protocol, such as preferred physical layer, session flow and transport protocol requirements are discussed in depth.
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