WHAT´S AN ISDN

In the article yesterday David Jost said.

"....

So the songs were reworked in a three hour video-conference, and Bill have sung them in a studio in Hamburg. Via ISDN they were recorded then in Los Angeles, Jost explained.

We have no clue what ISDN means. Do you?

Oh, ISDN = In a videoconference, ISDN provides simultaneous voice, video, and text transmission between individual desktop videoconferencing systems and group (room) videoconferencing systems.