Latest draft H.245

Raju Nadimpalli nsraju at CISCO.COM
Tue May 8 13:17:21 EDT 2001


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 at mailbag.cps.INTEL.COM]On Behalf Of Delphi
  Sent: Tuesday, May 08, 2001 1:53 AM
  To: ITU-SG16 at mailbag.cps.INTEL.COM
  Subject: How to get the heel of RAS Message.

  Hi, all:

  I have two problems concerning H.323 ASN.1.

  H.323 ASN.1 states as follows:
      h323-uu-pdu  H323-UU-PDU,
      user-data      SEQUENCE
         protocol-discriminator    INTEGER  (0..255),
         user-information            OCTET STRING (SIZE(1..131)),
  My question is," What's the use of "user-date" field and what its
protocol-discriminator field stand for? " Can anyone present me an example?

  The H.323 ASN.1 tells us that following the path
"H323-UserInformation>>h323-uu-pdu>>h323-message-body", we can get and set
UUIE of Q931 messages. But how can we do the same thing with RAS messages?
  Or, what are the "ABSOLUTE PATH", the root, of the messages?

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