supply of supply of 4 wire dtmf hq equipmentsupply of 4 wire dtmf hq equipment,supply of 4 wire dtmf hq equipment as per rdso specification. no.irs-tc-60-2007 with am endment-1 with all accessories. hq equipment with hand set & microphone. make epsilon or bentron [ warranty period: 30 months after the date of delivery ] ] , supply of 4 wire dtmf type way station equipment as per spn.no.irs-tc-60/2007 latest with control telephone as per spn.no.irs-tc-38/97 with latest amendment.(4 way dtmf station equipment wit h control phone) make: epsilon or bentron [ warranty period: 30 months after the date of delivery ] ] => limited