One of our most important clients utilizes an IP Office with J-series phones as a house-wide intercom that relies on the speakerphone volume to not be at the default. We'd like the speakerphone volume to stay consistent and not be changed without user input. I was provided this link by Avaya support regarding this being expected behavior: https://support.avaya.com/kb/index?page=content&id=SOLN320766