I had not seen that you edited your post to include your currently used software version prior to my reply.
You can check the Previous Releases section >here< for old and no longer supported versions. Our recommendation would be always using a supported version.
In regards to the parameter, the shared FAQ post explains how to use a single parameter and create the relevant configuration file.
I have attached this to the reply, please download, unzip and import this via the Web Interface using Utilities > Import & Export Configuration > Import Configuration
---------------- The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.
Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels. Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's