Leased Circuits National Trunk Services Int. They should first dial the code of the station and then the desired number. Charging of NSD Calls NSD calls are metered periodically based on full rate or concessional rates depending upon distance of the called station and the time of making the call as per four tier tariff, shown under concessional tariff table . On answering by the called party one unit is registered immediately.
Subsequent units depend on the pulse rate and call duration.
Disconnection of NSD calls To ensure disconnection at the end of NSD call replace handset on hook switch and lift again to listen for the dial tone. In the absence of dial tone report the matter to the concerned DE Incharge of Internal maintenance. Full Rate Con. Rate I Con. Rate II Con.