H.323 TCS Media Sample Size Preservation

For H.323 fastStart calls, the Oracle® Enterprise Session Border Controller can be configured to preserve the packetization interval from the called gateway if it differs from the one offered in the Setup message the calling gateway sent.

When this feature is disabled and in accordance with the ITU H.323 recommendation, the Oracle® Enterprise Session Border Controller changes the packetization rate to the one used by the calling gateway if the one offered by the called gateway differs. In the following example, this means that the Oracle® Enterprise Session Border Controller replaces the packetization interval of 20 with 30 before it forwards the Alerting message to the calling gateway.

However, not all H.323 elements comply with the ITU recommendation. Since some network elements do modify the packetization rate in the dataType element, this behavior is now configurable.

When you enable media sample size preservation, the Oracle® Enterprise Session Border Controller allows the packetization rate to be modified and forwards on the modified dataType element to the calling gateway. In the following example, you can see that the Oracle® Enterprise Session Border Controller forwards the called gateway’s Alerting with the packetization interval of 20 despite the fact that the calling gateway’s Setup specified 30.

Note that the calling endpoint might or might not work with the modified dataType.

You can enable this feature for the global H.323 configuration so that it applies to all H.323 fastStart calls, or you can enable it on a per-H.323 interface (stack) basis. When you enable this feature for an individual H.323 interface (stack), the Oracle® Enterprise Session Border Controller performs media sample size preservation for calls egressing on that interface.