How to get the heel of RAS Message.
qizj at CAPITEL.COM.CN
Tue May 8 22:40:22 EDT 2001
To get some information of one Q.931 message, say the "sourceInfo" of the
"SETUP" message, what's the path starting from "TCP data" should we follow?
The path: "TCP data --> H323-UserInformation --> h323-uu-pdu -->
h323-message-body --> setup --> sourceInfo " certainly is not right, as Q931
messages all have three outer mandatory fields: "Protocol discriminator",
"CallReference" and "MessageType". The "H323-UserInformatin" is only part
of "User-User" field, which in turn is in the same rank with "Protocol
discriminator", "CallReference" and "MessageType" fields.
There should be a divergence point where all the Q.931 messages received
from TCP are processed.
Could you please consider this and tell me the right path?
----- Original Message -----
From: Paul Long
To: ITU-SG16 at MAILBAG.INTEL.COM
Sent: Tuesday, May 08, 2001 11:43 PM
Subject: Re: How to get the heel of RAS Message.
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
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.
I have two problems concerning H.323 ASN.1.
H.323 ASN.1 states as follows:
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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