Supply And Testing Of Digital Telephone Set Compatible To Epabx System Having Following Features: Support Expansion Key Modules (M530/M535): 1, Head Socket: Dhsg, Display: 5x22 Character, Indicator Led: 2, Programmable Hard Keys: 12 Led, Fixed Function Keys: 10, Entries In Private Telephone Directory: 350, Last Number Redial List: 10, (Unanswered/Answered) Call List: 10/10, Switched Ethernet Ports: 10/100 Mbps Make : Mitel Model No. 5370 Or Similar Of Ericsson, Aastra .