supply of supply of l.c gates telephones systems (master telephone)supply of l.c gates telephones systems (master telephone),supply of l.c gates telephones systems (master telephone) with the inbuilt voice recorder f acility as per rdso spec. no. rdso/spn/tc/51/2021 or latest rev 3.0 or latest or similar (rdso item id 31 00180 , electronic l.c. gate telephone system spec: rdso/spn/tc/51/2021, rev.-1) [ warranty period: 30 months after the date of delivery ] ] , supply of gate telephone (slave telephone) of electronic l.c gate telephone system with v oice recorder & surge protection & line connection unit/ circuit as per rdso spec.no.rdso/spn/tc/51-202 1(rev1. or similar (rdso item id 3100180 , electronic l.c. gate telephone system spec: rdso/spn/t c/51/2021, rev.-1) [ warranty period: 30 months after the date of delivery ] ] , supply of 24 v dc 7 ah power supply unit for l.c.gate telephone systems as per rdso spec . no. rdso/spn/tc/51/2021 or latest or similar (rdso item id 3100180 , electronic l.c. gate telephon e system spec: rdso/spn/tc/51/2021, rev.-1) [ warranty period: 30 months after the date of delivery ] ]