supply of power supply system having both 12v/24v dc output including battery charger, master telephone unit with voice logging facility for electronic lc gate---------etc , power supply system having both 12v/24v dc output including battery charger with minimu m 7ah, 24v dc mf battery. 12v dc supply shall be connected to the station telephone unit & 24v dc shall be fed to line circuit for lc gate telephone system as per specification no. rdso/spn/tc-51/2011, rev 1.0 or latest. make: bentron or similar. [ warranty period: 30 months after the date of delivery ] ] , item code: 502355431698 item type : supply item description: master telephone unit with voice logging facility for electronic lc gate telephone system as per specification no. rdso/spn/tc/51/20 11 rev 1.0 or latest. make: bentron or similar. [ warranty period: 30 months after the date of delivery ] ]