Frank- The stimuli (signals to the endpoint and events to the gatekeeper/feature server) are carried in H.248 SignalsDescriptors and ObservedEventsDescriptors encapsulated in a stimulusControl element of the H323-UU-PDU for H.323 Annex L signalling. The H248SignalsDescriptor defined in the ServiceControlDescriptor may be used to send an announcement to an endpoint for service control. See TD-24a from Osaka for a description. Both Annex L and service control use the H248packagesDescriptor to identify which packages the endpoint supports. -Bob ---------------------------------------------------- Bob Gilman rrg@avaya.com +1 303 538 3868

Frank Derks wrote:

As from version 4 of H.323, stimulus signalling using H.248 is possible with H.323. The H.225.0 ASN.1 has been extended with an H248PackagesDescriptor (PackagesDescriptor from H.248) and an H248SignalsDescriptor (SignalsDescriptor from H.248) to make this possible.

The first allows for the specification of the package(s) from which signals/event may be used. The second, however, would seem to restrict the use of H.248 to signals only. I.e. H.248 events can not be carried by H.323 because there is no field for the EventsDescriptor.

Is this intentional and if so why? (Or do I misinterpret things?)

Regards,

Frank

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