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).
A feature allowing sending calls to queues or extensions based on set criteria. In example, a skill based routing where calls are directed to an agent or person, who has the most appropriate skill set in order to address the problem.