Freelance VoIP/PBX Engineer (Project-Based)

About the ProjectWe are looking for an experienced VoIP/PBX Engineer to lead the implementation of a new SIP Trunk solution for our global PBX infrastructure. The selected freelancer will be responsible for evaluating Saudi telecom providers, selecting the most suitable solution, coordinating directly with the chosen carrier, and completing the full SIP Trunk integration into our existing FreePBX/Issabel environment.This is a short-term project expected to be completed within approximately two weeks.Key ResponsibilitiesEvaluate Saudi telecom providers, including STC, Mobily, Zain, and other available carriers.Compare SIP Trunk pricing, commercial terms, technical capabilities, and service offerings.Recommend the most suitable provider based on reliability, voice quality, scalability, and cost-effectiveness.Coordinate directly with the selected telecom provider throughout the provisioning process.Obtain all required SIP Trunk credentials and technical configuration details.Configure, integrate, and fully deploy the SIP Trunk within our existing FreePBX/Issabel environment.Configure and validate: Inbound and outbound calling Caller ID presentation SIP routing and dial plans Codec configuration Call routing and failover Overall call quality and system performanceTroubleshoot and resolve any SIP, RTP, networking, or call quality issues encountered during implementation.Deliver complete documentation of the final configuration and deployment.Required Skills & ExperienceThe ideal candidate has proven hands-on experience with:SIP Trunks and carrier integrations, particularly with STC, Mobily, Zain, or other Saudi telecom providers.PBX platforms including FreePBX, Issabel, 3CX, and Yeastar.SIP routing, dial plans, media paths, failover, and high-availability voice environments.Designing and scaling VoIP infrastructure for high call volumes.Troubleshooting SIP/RTP issues, including packet loss, latency, one-way audio, NAT traversal, and signaling problems.Strong networking knowledge, including: TCP/IP SIP & RTP VLANs QoS Firewalls NATWorking directly with Saudi telecom providers throughout the provisioning and implementation process.Preferred QualificationsPrevious experience implementing enterprise SIP Trunk solutions in Saudi Arabia.Ability to independently deliver end-to-end SIP Trunk deployments.Strong problem-solving skills and excellent communication.Project DetailsDuration: Approximately 2 weeksStart Date: ImmediateLocation: Remote