Re: Relationship of H.323 and H.245 versions
Gary, Chris and others,
To try an clear this issue up I propose that the text below should be added to the implementors' guide and be rolled into H.323 V3. Let me know what you think (No comment will probably mean OK by me as per normal, but will probably have to put a contribution into next meeting anyway.)
Proposed text:
In H.323 version 2 there is conflicting advice on which versions of H.245 should be used with versions H.323. The summary states that H.323 version 2 should use H.225 version 2 and H.245 version 3. However, in the Normative References section it states that implementors are "...encouraged to investigate the possibility of applying the most recent edition of the Recommendations...". To clarify this, the following section is published in the implementors' guide as a clarification to H.323 version 2 and a similar paragraph will be added to H.323 Version 3. The Relationship of H.323 versions to H.225.0 and H.245 versions Entities claiming compliance to H.323 Version 2 shall implement all mandatory features in this recommendation and in H.225.0 version 2. An H.225.0 version 2 implementation is identified by the protocolIdentifier in the messages being set to {itu-t (0) recommendation (0) h (8) 2250 version (0) 2}. H.323 version 2 compliant entities shall implement H.245 version 3 or later. An H.245 version 3 implementation is identified by the protocolIdentifier in the terminalCapabilitySet message being set to {itu-t (0) recommendation (0) h (8) 245 version (0) 3}. Implementations must also be aware that, due to the procedures for 'Third party initiated pause and re-routing,' they may be connected to different versions of H.245 at different times during the life of the call. Therefore, under no circumstances shall an entity infer the version of the H.245 implementation from the protocolIdentifier carried in H.225.0 messages.
And as a word version to help editors!
Regards,
Pete ================================= Pete Cordell BT Labs E-Mail: pete.cordell@bt-sys.bt.co.uk Tel: +44 1473 646436 Fax: +44 1473 645499 =================================
From: Gary A. Thom[SMTP:gthom@delta-info.com] Sent: 14 January 1999 19:02 To: Pete Cordell Subject: Re: Relationship of H.323 and H.245 versions
Pete,
This is a very good question, and one which may need to be answered by bigger minds than mine.
I do not have a definitive answer, but my opinion is:
In order to claim compliance with H.323 V2, an entity shall implement at lease H.225.0 V2 and H.245 V3. This would allow an advanced H.323V2 terminal to incorporate H.245 V4.
However, as part of the H.225.0 and H.245 message exchange (protocolIdentifier parameter), each entity will be aware of the version of the entity which it is communicating with.
The receiver, "shall not malfunction or be adversely affected by receiving H.245 messages it does not recognize". Does this include messages from future versions??? Or does the transmitter have to know that it is talking to a version X entity, so it cant send any messages from versions greater than X???
Gary
Name : Gary A. Thom Company: Delta Information Systems, Inc. Address: 300 Welsh Rd., Bldg 3 Horsham, PA 19044 USA Phone : +1-215-657-5270 Fax : +1-215-657-5273 E-mail : gthom@delta-info.com
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Pete,
I understand what you're trying to do, but I'm a little concerned about allowing a v2 entity to support any version of H.245, including unspecified future versions which may or may not be compatible with what we have now.
So let me propose the following paragraph as replacement text for the offending portion of the H.323 Version 2 Summary section (which begins in the same way).
"Products claiming compliance with Version 2 of H.323 shall comply with all of the mandatory requirements of this document, H.323 (1998), which references H.225.0 (1998) and H.245 (1998). The protocol identifiers used in messages defined in H.225.0 (1998) and H.245 (1998) are specified in those recommendations. An H.323 Version 2 compliant product may also be compliant with other versions of these recommendations, but should not send messages or invoke procedures defined in a newer version of a recommendation than a peer has identified itself as supporting."
Regards,
Dave Walker Mitel Corporation Ontario, CANADA
participants (2)
-
Dave Walker -
Pete Cordell