Quality Assurance - Solid understanding and development of QA management technique. - Responsible for setup and configuration of Voice over IP (VoIP) - Wrote, reviewed and executed detailed test plans. - Configured multi-domain of test environment including presence and unified messaging. - Tracked progress against plan and reported to upper management. - Used specialized testing software tools (Wireshark, Sipp, Selenium Test Automation Framework, Jira, ...). - Coordinated with developers and other departments as required to obtain maintain service levels. - Analyzes results and determines bugs and other outstanding issues.Support and installation Support and installation: - Works with necessary teams to resolve defects in a timely and cost effective manner. - Installation and configuration all applications VoIP for new and existing customers. - Provided technical support for users. - Configurations and implementing upgrades of Gateways, IP-Phones and A