Fast Start to Slow Start Translation

The Oracle® Enterprise Session Border Controller supports translations from H.323 Fast Start to Slow Start. Using this feature, an H.323 endpoint that only supports Slow Start can call from a Fast Start source when that call goes through the Oracle® Enterprise Session Border Controller.

In a Fast Start call, the originating H.323 endpoint sends a fastStart element in its Setup message. This element contains H.245 OLC messages that allow Fast Start endpoints to establish a media stream when the call is connected. As a result fewer messages are exchanged between the H.323 endpoints than there would be for a Slow Start call (where the fastStart element does not appear). Because media information is sent in the Setup request for the session, there is no need to use the media profiles when converting a Fast Start call to Slow Start.

When you enable the slow start option in the H.323 stack configuration, the Oracle® Enterprise Session Border Controller performs Fast Start to Slow Start conversion. During the translation, the Oracle® Enterprise Session Border Controller retains the media information included in the incoming Fast Start call as it negotiates a connection with the Slow Start endpoint. After a connection with the Slow Start endpoint has been established, the Oracle® Enterprise Session Border Controller negotiates the media capabilities.