Experienced PBX and VoIP engineer with comprehensive expertise in configuring and managing Asterisk, Yeastar PBX and Gateway ,GrandStream, Issabel ,VICIdial, and other software-based PBX systems. Skilled in telephony technologies, network security, and system integration. Strong ability to develop customized solutions, including call center reporting, post-call surveys, and CRM integrations, with a focus on enhancing client satisfaction and operational efficiency.Survey Integration & Automation• Survey After Call (Inbound Satisfaction Survey): Developed and implemented a post-call satisfaction survey for inbound calls using Asterisk. The system prompts callers to rate their experience after completing the call. The survey flow was built into the Asterisk dialplan to automatically gather and log responses.• Survey Auto-dial Campaign: Automated satisfaction survey campaigns by setting up auto-dial calls via VICIdial. After customer interaction, the system would dial customers and record their feedback. This was integrated into the call center’s database for comprehensive customer satisfaction reporting.Technical Skills• PBX Systems & VoIP Technologies: Asterisk, Issabel, VICIdial, Grandstream, Yeastar, Dinstar, FiberMe, • Gateway Configuration: SIP Trunks, Grandstream, Yeastar, Dinstar, FiberMe, Sangoma• customize report in issabel call center and vicidial• Linux Administration: CentOS, Ubuntu (Command-Line & GUI)• CRM Integration: Vtiger CRM customization with Asterisk PBX (click-to-call, pop-ups)• Security & Firewall: Sophos, FortiGate, Draytek (VPN setup, site-to-site, web filtering)• Network Configuration: Nano Station setup,• ESXI VM Install and manage ESXI Create Machine • Backup solution (VMware vCenter & Veeam backup )• Windows Server Management: 2012, 2016, 2019 (Active Directory, DHCP, Remote Desktop Services, • Web Development: HTML, CSS, Bootstrap, PHP scripting