Generic Extensibility Framework elements in SETUP are different from those in other Call Signalling messages, why?

[Frank Derks]

The SETUP messages contains the three elements neededFeatures, desiredFeatures
and supportedFeatures. The other call signalling messages contain on single
featureSet element that includes these three elements. Why does the SETUP
message deviate frome the other call signalling messages?

Regards,

Frank

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