Paul, the user-data field is a container for a "real" Q.931 user-user information element. Since H.225.0 re-defines the User-user IE for its own use, Q.931 user-user information, if present, must be put somewhere else, that's why the user-data field was included in H323-UserInformation. I don't know if it is ever used in practice. Ernst Horvath Siemens AG -----Ursprüngliche Nachricht----- Von: Paul Long [mailto:plong@IPDIALOG.COM] Gesendet am: Dienstag, 08. Mai 2001 17:43 An: ITU-SG16@mailbag.cps.INTEL.COM Betreff: Re: How to get the heel of RAS Message. Delphi, 1. I have no idea what the user-data component is used for. 2. I don't know what you mean by "get and set," but RAS does not use Q.931 or UUIEs in its encoding. It uses ASN.1 PER exclusively. I assume by your other question that you are asking what the outer-most encoding is for RAS. With call-signaling, it's Q.931; with RAS, it's ASN.1 PER--RAS uses ASN.1 PER throughout. Paul Long ipDialog, Inc. -----Original Message----- From: Mailing list for parties associated with ITU-T Study Group 16 [mailto:ITU-SG16@mailbag.cps.INTEL.COM]On Behalf Of Delphi Sent: Tuesday, May 08, 2001 1:53 AM To: ITU-SG16@mailbag.cps.INTEL.COM Subject: How to get the heel of RAS Message. Hi, all: I have two problems concerning H.323 ASN.1. 1> H.323 ASN.1 states as follows:

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>>> H323-UserInformation::=SEQUENCE {

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