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).
The feature, which is not redirecting calls to the voicemail, during the big traffic in peak hours. All calls will be put on waiting mode for the next available operator.