supply of programmable primary digitalprogrammable primary digital,programmable primary digital drop/insert multiplexer with conference facility fully wired for 30 channels complete with accessories and power supply e.t.c as per rdso speen. irs- tc-68/2012 with amendment, make-webfil only. [ warranty period: 30 months after the date of delivery ] , supply of voice card 2w/4w e&m 4 circuits webfil mux as per rdso specification no. tc 68- 04/2012 with amdt. no.1 . make-webfil only. [ warranty period: 30 months after the date of delivery ] , supply of voice card ( subscriber interface ) card of webfil mux as per rdso specification no. tc 68-04/2012 with amdt. no.1. (for extension of subscriber line ). make-webfil only. [ warranty period: 30 months after the date of delivery ] , supply of voice card ( subscriber interface) card of webfil mux as per rdso specification no. tc 68-04/2012 with amdt. no.1.(for extension of hot line ) make-webfil only. [ warranty period: 30 months after the date of delivery ]