The ability to vary the transmission speed in support of various applications, including videoconferencing. In videoconferencing applications, an inverse multiplexor of I-Mux takes a digital signal that comes from a co-dec and divides it into multiple 56 or 64 kbps channels for transmission across a switched digital network. On the distant end, a compatible I-Mux recombines these channels for the receiving codec, and therefore en-sures that even if the data takes different transmission paths, it will be smoothly recombined at the receiving end.
A feature that reduces costs by automatically determining whether or not a second ISDN B-Channel is necessary during data transfer. For example, the Retoura evaluates the percent of usage on a single ISDN B-Channel (in a data transfer). If the utilization exceeds 90% for a specified length of time, the Retoura automatically brings up the second B-channel to speed up the transfer. Then it reverts back to one B-channel when two are no longer necessary.