supply of supply of master telephone,slave telephone & 24 vdc power supply unit of electronic lc gate communication system with voicesupply of master telephone,slave telephone & 24 vdc power supply unit of electronic lc gate communication system with voice,supply of master telephone with voice logging facility for electronic lc gate telephone syste m as per specification no : rdso /spn/tc -51/2021 revision 1.0 with latest amendment. material is acce pted only with oem warranty certificate. [ warranty period: 30 months after the date of delivery ] ] , supply of slave telephone of electronic lc gate communication system with voice logging f acility as per rdso spec. no. rdso /spn/tc -51/2021 revision 1.0 with latest amendment. with a surge pr otection device and line connection unit. [ warranty period: 30 months after the date of delivery ] ] , supply of 24 vdc power supply unit with mf battery for electronic lc gate telep hone system as er rdso spec no. rdso/spn/tc/51/2021-rev-1 or latest. [ warranty period: 30 mo nths after the date of delivery ] ]