A company asks a solutions architect to review the architecture for its messaging application. The application uses TCP and UDP traffic. The company is planning to deploy a new VoIP feature, but its 10 test users in other countries are reporting poor call quality. The VoIP application runs on an Amazon EC2 instance with more than enough resources. The HTTP portion of the company's application behind an Application Load Balancer has no issues. What should the solutions architect recommend for the company to do to address the VoIP performance issues?