[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentOptions](./sip.js.useragentoptions.md) > [preloadedRouteSet](./sip.js.useragentoptions.preloadedrouteset.md) ## UserAgentOptions.preloadedRouteSet property Adds a Route header(s) to outgoing requests. Signature: ```typescript preloadedRouteSet?: Array; ```