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).
Designed by Digium the Switchvox AA305 VoIP Pbx Appliance ensures support of up to 150 users simultaneously. The device can support up to 45 concurrent calls, 15 conference participants and 10 concurrent call recordings.