Heating Cooling Units

What is the purpose of a small box between the telephone line and the phone?

MTNL and BSNL use a small plastic box (about 2x2 inches) before fixed telephone set. What is the purpose of the little box. I removed my phone and still not working perfect. A response saying "This box is required for connecting multiple phones more than one." But it is only one entrance and an output port.

This could be an ADSL microfilter. If you have a DSL Internet connection, the filter is used to avoid overlaps between the signals DSL and your voice signals. The link I referenced Wikipedia will tell you more about this, and the second will show a picture of a "filter line 'with an entry and exit, as you described in your question.

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