E1/T1
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).
This service allows called party to listen to the audio or video announcements of callers before connection. The caller can choose a message that will be played and conditions by which the message will be plaid over. For example, before the subscriber answers the call, they will hear audio message with the name of the person who is calling.
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