A European format for digital transmission. E1 supports signals at 2 Mbps (32 channels at 64Kbps, with 2 channels reserved for signaling and controlling), versus the T1, which carries signals at 1.544 Mbps (24 channels at 64Kbps).
Conferencing is related to the service, which allows creating the
conference when all participants are in different places. It gives a chance to
communicate, exchange data and correspond in real time and also allows using
the video signal that gives a chance to see one another.