supply of supply of electronic lc gate telephone system with voice loggersupply of electronic lc gate telephone system with voice logger,supply of electronic lc gate telephone system with voice logger facility as per rdso spec no rdso/spn/tc/51/2011 (rev 3.0) or latest consist of one master telephone, 06 slave telephone with modifie d surge protection & line connecting unit and 24 volt dc power supply unit with mf battery compatible with existing electronic lc gate telephone system of ddu division. make: bentron power system or similar or be tter [ warranty period: 30 months after the date of delivery ] ] , supply of electronic lc gate telephone system with voice logger facility as per rdso spec no rdso/spn/tc/51/2011 (rev 3.0) or latest consist of one master telephone, 06 slave telephone with modifie d surge protection & line connecting unit and 24 volt dc power supply unit with mf battery compatible with existing electronic lc gate telephone system of ddu division. make: bentron power system or similar or be tter [ warranty period: 30 months after the date of delivery ] ] => limited