info-mac@uw-beaver (info-mac) (09/26/84)
From: Lauren Weinstein <vortex!lauren@RAND-UNIX.ARPA> While the "basic" tone frequencies in use for the CCITT standard modems and U.S. standard modems (CCITT V.22bis vs. US 212) are the same, there are important differences during connection initialization that can make them incompatible without modification. For example, echo suppressor frequencies are different in most of Europe and this is important during call startup. Also note that laws regarding modems are very strict overseas -- in general most equipment must be rented directly from (or be explicitly approved by) the telecommunications authority. --Lauren--