Having worked extensively with Linux and specialized in web development, I understand the importance of fluid and efficient system interactions, which makes me perfect for your FreePBX 17 and Dinstar GSM Gateway setup. My strong command over the MERN stack - especially Node.js - aligns seamlessly with the technical requirements of setting up outgoing calls through SIP extensions, while my experience with RESTful APIs corroborates my abilities to handle PJSIP configuration.
The beauty of freelancing is that it allows me to explore diverse technical areas, and in this endeavor; I've gained substantial knowledge regarding SIP and VoIP technologies. This, along with my experience working on React.js interfaces for SPA development on real-time data, makes me confident I can ensure a smooth synchronization between the gateway and FreePBX while harnessing your project's full potential.
To wrap up, my experience using Vector for accounting shines light on my problem-solving capabilities -- an invaluable asset when it comes to identifying and rectifying any potential problems in a network environment. With me on board, you won't just get the job done but completed meticulously by a diligent web developer who values clean code solution as much as you do. Hire me, and let's make your system speak volumes about efficiency!