Fast Start Slow Start Translations

The Oracle® Enterprise Session Border Controller can translate between Fast Start H.323 endpoints and Slow Start H.323 endpoints. Using this feature, you can reduce delay in establishing media, improve performance, and reduce network congestion caused by a high number of messages being exchanged. Fast Start and Slow Start calls handle information about media for a session in different ways. In a Fast Start call, information about the media is contained in the Setup message. In a Slow Start call, that information is exchanged between endpoints after the session has been established.

When you Fast Start/Slow Start translation, the Oracle® Enterprise Session Border Controller can take a Slow Start call from an H.323 endpoint that does not support Fast Start and re-initiate that call as Fast Start. It also allows an H.323 endpoint that does not support Fast Start to receive a Slow Start call from a Fast Start source because the Oracle® Enterprise Session Border Controller performs all necessary translations.

For the ACLI, the following parameters apply:

fs-in-first-msg       Fast Start must be sent in 1st response to Setup message
call-start-fast       Enable outgoing Fast Start call
call-start-slow       Enable outgoing Slow Start call
media-profiles        list of default media profiles used for outgoing call