Gate Telephone (Slave Telephone) Of Electronic L.C. Gate Telephone System, With Voice Recorder & Surge Protection & L Ine Connection Unit/Circuit As Per Rdso Spec No. Rdso/Spn/Tc/51-2021 (Rev.-1.0) With Latest Amendment/ Revision Till The Date Of Op Ening Of Tender. Make Epsilon Or Similar. This Includes Supply, Installation, Testing & Commissioning Of System [ Warranty Period: 3 0 Months After The Date Of Delivery ] ]