On the telephone line the information is exchanged between two parties as voice or as data (fax). If someone can tap the telephone line from the pole or from anywhere between the telephone and the exchange, then he can listen to the conversation. It is also feasible that a fax can be sent to a [...]
These devices are used on the normal telephone line to identify from where the telephone call was made. In case there is threatening call or a obscene call then using such a device it can be seen from where the call originated. Most of the enforcement agencies today are equipped with such devices. Such devices [...]
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