# addSession(_:) Adds a session to the active route. ``` final func addSession(_ session: AVSystemRouteSession) -> Bool ``` ## Parameters `session` The session to add to this route. The session must be newly created and not already associated with another route or previously stopped. ## Return Value `true` if the route successfully adds the session; `false` if the route cannot add it (for example, if the session is already associated with another route or if the route is in an invalid state). ## Discussion Call this function to register a new [`AVSystemRouteSession`](/documentation/AVSystemRouting/AVSystemRouteSession-gp78) with the route before starting playback or communication. The session must be added to the route before calling its [`start()`](/documentation/AVSystemRouting/AVSystemRouteSession-gp78/start()) function. Adding a session establishes the association between the session and this route, enabling the system to manage the session’s lifecycle and route media appropriately. You can add multiple sessions to a single route to handle different media streams or communication channels. Sessions are single-use. Once a session has been stopped, it cannot be added to a route again. Create a new [`AVSystemRouteSession`](/documentation/AVSystemRouting/AVSystemRouteSession-gp78) for each new playback. > Note: You must remove sessions when they are no longer needed using ``doc://com.apple.avsystemrouting/documentation/AVSystemRouting/AVSystemRoute-5s2um/removeSession(_:)`` > to release system resources. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)