Call signaling and media are handled by separate services for resiliency and scaling purposes. Genesys Cloud’s media services are autoscaling microservice instances, which are instantiated or removed as needed based on platform load. These instances draw IP addresses from a pool of Genesys owned IP ranges, or a large pool of public addresses in AWS depending on the region. For more information, see the Domains and IP Addresses section of the About ports and services for your firewall article.