Speech transmission performance planning in hybrid IP SCN networks

The introduction of Internet Protocol technology into traditional telecommu nications networks is changing the nature of speech communication in those networks. As the current switched network infrastructure is augmented by pa cket networks, the needs of voice users of these hybrid networks must be gi ven due consideration. These users are accustomed to high-quality connectio ns with low distortion in the speech signal and low transmission delay in t he speech path. In order for packetized networks to gain widespread accepta nce for speech transmission services, it is necessary to maintain this high -quality performance in the evolving networks. In this article we discuss r elevant speech transmission performance requirements and the associated act ivities faking place in regional and international standards bodies.