In this paper we present our implementation of a telephone conferencing system that renders a spatial representation via binaural synthesis. The implementation extends the open-source software Asterisk and complies with established Voice-over-IP standards. The implementation only requires clients to be capable of receiving and reproducing the rendered binaural signals (two channels). Furthermore, the implementation is backward-compatible as clients not fulfilling these requirements are provided with mono-rendered signals without additional spatial information. The implemented system is released as open-source software and will enable researchers to investigate the (dis-)advantages of spatial conferencing under real-world conditions. The project name is Spatial TelephonE conferencing for AsterisK (STEAK)
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