Field Upgrade - Protel v.3 to Protel v.4

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...
Fri, Jan 5, 2018 at 9:57 AM
Preparation steps for field upgrade
Burn a Ubuntu Server 16.04 install DVD disc.  Download the disc image from For a Protel 2106 or 3510 wall mount, use the...
Fri, Jan 5, 2018 at 9:24 AM
Field Upgrade Process
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 in...
Fri, Jan 5, 2018 at 9:36 AM