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).
Asterisk 1.6 emerged with the several features of version 1.2 and 1.4, and also it features new dial plan functions. Further is the list of the recent updates on functionality changes.
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