supply of master telephone with in built voice logger/slave telephonemaster telephone with in built voice logger/slave telephone,supply, installation, testing and commissioning of slave telephone as per spec no- rdso/sp n/tc51/11 rev. 3.0 or latest and compatible with existing lc gate communication system. make/brand: - b entron power system or similar. [ warranty period: 30 months after the date of delivery ] ] , supply and transportation of master telephone with inbuilt voice logger along with power su pply as per spec nordso/spn/tc-51/11 rev. 3.0 or latest and compatible with existing lc gate communic ation system. make: epsilon or similar. accepted make/brand:- bentron power systems or similar. [ warra nty period: 30 months after the date of delivery ] ] , supply and transportation of master telephone with voice logging facility of latest model for electronic lc gate telephone system as per specification no : rdso /spn/tc -51/2011 revision 3.0 with a mendment no 1 or latest. make/brand- bentron power system or similar. [ warranty period: 30 months a fter the date of delivery ] ] , supply and transportation of master telephone with inbuilt voice logger along with power su pply as per rdso specification no. rdso/spn/tc/51/11 rev 3.0 or latest and compatible wih existing lc g ate communication system. make/brand- bentron power system or similar. [ warranty period: 30 months after the date of delivery ] ]