To upgrade a Protel v3 PBX to version 4, the disc drive must be wiped clean and a new server operating system installed on it.
Follow the preparatory instructions here
During your field upgrade session, a nexMatrix support technician will guide you through the complete process to install the new Linux OS onto the PBX server hard drive.
After the new Ubuntu 16.04 system has been installed, nexMatrix will need to be able to access your PBX via a remote SSH session (TCP port 22) to install the Protel LTS version 4 software. Your support technician can assist you with the necessary port-forwarding settings in your router.
The final steps after the updated software is installed will be to apply your backup configuration file. This will restore complete functionality to the PBX.
The entire process takes about 2 hours. Please schedule this with your account representative, or directly with nexMatrix support, at 855-639-6287.
Preparation steps for field upgrade
Burn a Ubuntu Server 16.04 install DVD disc. Download the disc image from http://releases.ubuntu.com/16.04/ For a Protel 2106 or 3510 wall mount, use the 32-bit i386 server install image. For all other Protel models, including the 3510 1u rack ...
Why upgrade to version 4?
The Protel LTS PBX application runs on Linux Ubuntu Server as its base operating system. Protel LTS version 3, first released in 2013, requires Linux Ubuntu 12.04. This version of Ubuntu reached end-of-life in June of 2017, and as of January 1, ...
11/21/2016 Upgrade to v4 + new features
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