supply of electronic lc gate master telephone with voice recorderelectronic lc gate master telephone with voice recorder,supply of electronic lc gate master telephone with voice recorder, surge protection and lin e connection unit/circuit as per specs no. rdso/spn/tc/51- 2021 (rev. - 1.0 or latest). make: epsilon, bentr on or similar. [ warranty period: 30 months after the date of delivery ] ] , supply of slave telephone for electronic lc gate telephone system of voice logging facility as per rdso specification no: rdso/spn/tc/51-2021 (rev. - 1.0 or latest). make: epsilon, benton or similar [ warranty period: 30 months after the date of delivery ] ]