Sound volume levels are too low for some conference participants. A potential reason can be because these participants connect through international trunks in which the Central Office (CO) loss plans have substantial losses.
Solution
Procedure
At the command prompt, type change location-parameters xxx, and press Enter. Where xxx is the number of the location.
On the Loss Plans page of the Location Parameters screen, administer the End-to-End total loss (db) in a n-party conference field.