Call settings with additional call parameters, such as preferred video codec, custom data, extra headers etc.
Custom string associated with the call session. It can be passed to the cloud to be obtained from the CallAlerting event or Call History using HTTP API. Maximum size is 200 bytes. Use the ICall.sendMessage(String) method to pass a string over the limit; in order to pass a large data use media_session_access_url on your backend
Optional set of headers to be sent to the Voximplant cloud. Names must begin with "X-" to be processed by SDK.