Without audio, a video call is generally useless unless the video is being used for sign language or some other special application. For many years, videoconferencing users have appreciated the superior quality of the audio call that is generally part of a video call, compared to ordinary telephony. In the past five years, several vendors have introduced multi-codec videoconferencing endpoints, widely known as telepresence systems, and these devices have taken audio to a new level for business meetings while also presenting vendors with a new set of interoperability challenges.
Andrew Davis and I published a new paper (Wainhouse Research Note) on audio performance in multi-screen (multi-codec) telepresence systems. We looked at three scenarios: point-to-point calls between systems from the same vendor, multipoint calls with equipment from the same vendor, and finally, point-to-point calls between systems from different vendors. You would be surprised how the quality of the audio changes depending on the configuration.
The paper is available to WR subscribers at http://wainhouse.com/index.php