We can enable voice trace on your account with your permission. This will be enabled for 15 days and we will use voice trace to monitor your calls and check the quality.
During this time, we also require 3 or more call samples along with from number, to number and time of the call. Ensure that the samples are not older than 24-48 hours.
Post this, we will contact the respective carrier partners to take the necessary steps to improve the call quality.