Hello Hashim H.,
I am Shahzaib, a Linux and Network Administration expert with over 5 years of experience. I have carefully reviewed your project requirements for integrating smartphones with the Yeastar S300 PBX over the internet securely. With my expertise in Yeastar S300 PBX systems, VoIP solutions, and remote access setup, I am confident in providing a reliable and secure connection for your project. Please review my portfolio at
Portfolio: https://www.freelancer.co.uk/u/theshahzaibkhan
and let's discuss further.
Regards,
Shahzaib