knowledge on: Yeastar, Mitel & 3CX Certification and ECN Certification. Must have VOIP Knowledge, VBX and the customers on new PBX systems, VOIP systems and ECN products and MAN3000 systems. Experience on IP based Knowledge on: Yeastar, Mitel & 3CX Certification and ECN Certification. Must have VOIP Knowledge, VBX and the customers on new PBX systems, VOIP systems and ECN products and MAN3000 systems. Experience on IP based