The rate should be set to 64k unless there is good reason not to. UBC are required to route our calls through BCTel at 64k. If this is not done and we are routed through Sprint, 64k is not supported for long-distance calls. For general info on ISDN, see e.g. Dan Kegel's ISDN Page Bugs No local video. This bug has been seen twice, but is difficult to reproduce.
Symptoms are a failure of the video windows to update.
It may be necessary to restart Win95 and re-dial. Round brackets are required around the area code to allow long-distance prefix and calling card substitutions to work. Country code tag to allow calling card substitutions is unknown. Microphone input bug. There seems no definitive way to set the video format.