Abstract: A method is provided for use in transmission of audio signals over an IP network. By this method the synchronous operation of a pair of interconnected an audio encoder and an decoder implementing at least one audio algorithm is coordinated, by transmitting a message indicating that a synchronous reset is required.

Abstract: A digital circuit multiplication system for interconnecting a transmission trunk link having a plurality of bearer channels to a second plurality of telephone communication trunks, with the second plurality exceeding the first. The system comprises transmission apparatus at a first end of the transmission link within which there is apparatus for detecting signals on the second plurality of telephone communication trunks and apparatus for assigning each trunk on which signals are present to an available one of the first plurality of bearer channels and for providing assignment messages indicating such assignments. The speech signals are transmitted in bit reduced form by adaptive differential pulse code modulation (ADPCM) transmitting apparatus which is operative to be coupled to the first plurality of bearer channels.