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).
The majority of PBX systems are able to output Call Detail Record (CDR) or Station Message Detail Record (SMDR). Basically the systems are the same and they contain detailed information of telephone activity inside the organization. Usually these reports contain information regarding all the incoming and outgoing calls, the information includes dates and times of the call, duration, direction, numbers dialed and Called ID.
VIETTEL TELECOM
Viettel Group is one of leading telecom service providers in the world with over 50 million subscribers. Wireless Intelligence has ranked Viettel Group as the 19 th out of 784 biggest telecom service providers in the world regarding the number of subscrib
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