With reference to H.323 Annex K, ServiceControlDescriptor has following ASN.1 syntax:

ServiceControlDescriptor ::= CHOICE { url IA5String (SIZE(0..512)), -- indicates a URL-referenced -- protocol/resource signal H248SignalsDescriptor, nonStandard NonStandardParameter, callCreditServiceControl CallCreditServiceControl, ... }

The use of "url" part is very well described in Annex K but I could not find the use of H248SignalDescriptor in any of the H.323 Annex K documents. I believe the reason for this codepoint is to use H.248 functionality in controlling supplementary Services at the endpoints, but isn't that what H.323 Annex L tries to achieve using Stimulus Control Protocol (Which is also H.248 based). Are we trying to achieve the same function by using this codepoint in Annex K. I shall appreciate if someone could clarify the use of H.248SignalDescriptor in ServiceControl Descriptor structure.

thanks Manoj Paul.

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