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).
Putting the call on hold by pressing the “Flash” button; the holding time is not limited. The function could be easily used at the moment when the second call has entered the line. By pressing the hold button the conversation will be set on pause and another call can be answered, finishing which you can return to the one which is on the pause mode.
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