Codec Request Change from the H.323 Side
When the Oracle® Enterprise Session Border Controller receives a codec request change on the H.323 side of an IWF call, it sends a Re-INVITE to the SIP endpoint containing new codec and information. The Oracle® Enterprise Session Border Controller uses IP address and port information it has cached for the H.323 side of the call for the Re-INVITE since H.245 Request Mode requests do not have this data. If the IP address and port combination should subsequently change (in an OLC from the H.323 side), the Oracle® Enterprise Session Border Controller handles additional INTVITEs on the SIP side to support the change.