Pete,

Your interpretation of the sentence would permit us to achieve what we want to do with no rewording. As Martin mentioned, we are trying to use the tokens and cryptoTokens field that comes with all H.225.0 message UUIEs to provide security services for H.245 messages. This then implies that whenever a H.245 message is to be sent, there is a "need" for transmission of a Q.931 message, since there is a "need" for using the tokens and cryptoTokens field of the Q.931 message UUIE. With that interpretation, we are set. Thanks.

Regards, Senthil ---------- From: Mailing list for parties associ To: ITU-SG16 Subject: Re: Tunneling in FACILITY Date: Thursday, November 26, 1998 3:59PM

The point is what we should do with the H.245 tunneling mode when there is no Facility message to be sent but we still want to secure the tunneled message with the ClearText and CryptoTokens.

Idea is to send "dummy" information in the facility message containing at least some "useless" information. However, when the facility message would empty as specified in H.323v2 section 8.2.1 then the CryptoTokens and ClearTokens could not be used.

Martin.

----------------------------------------------------------------------- | Dipl.-Inf. Phone: +49 89 636-46201 | Martin Euchner Fax : +49 89 636-48000 | Siemens AG | ZT IK 3 mailto:Martin.Euchner@mchp.siemens.de | | Otto-Hahn-Ring 6 | 81730 Muenchen | __________________ | Germany -----------------------------------------------------------------------

-----Original Message----- From: Pete Cordell [SMTP:pete.cordell@BT-SYS.BT.CO.UK] Sent: Donnerstag, 26. November 1998 12:48 To: ITU-SG16@mailbag.cps.intel.com Subject: Re: Tunneling in FACILITY

Senthil,

I think if what you are doing needs you send tokens etc., then the only way to do this is to send a Q.931 message, which means that you need to send a Q.931 message! Therefore I think the original version of the sentence still holds.

Or perhaps I am missing something!

Regards,

Pete

Pete Cordell BT Labs E-Mail: pete.cordell@bt-sys.bt.co.uk Tel: +44 1473 646436 Fax: +44 1473 645499 =================================

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From: Sengodan Senthil NRC/Boston[SMTP:sengodan@NASBPD01BS.NTC.NOKIA.COM] Reply To: Mailing list for parties associated with ITU-T Study Group 16 Sent: 25 November 1998 21:37 To: ITU-SG16@MAILBAG.INTEL.COM Subject: Tunneling in FACILITY

Folks,

Section 8.2.1 of H.323 states:

"If tunneling is being utilized and there is no need for transmission of a Q.931 message at the time an H.245 message must be transmitted, then a FACILITY message shall be sent with 'h323-message-body' set to 'empty'."

I would like to know - for the case where no Q.931 message needs to be sent - if there are any negative implications of setting the 'h323-message-body' to 'facility' with 'reason' set to 'undefinedReason'. This would enable the use of several fields that are available within the 'Facility-UUIE' structure - such as 'tokens' and 'cryptotokens' - which would not be available if 'h323-message-body' is set to 'empty'.

A rewording of the sentence as below would enable this:

"If tunneling is .... a FACILITY message shall be sent and the 'h323-message-body' should be set to 'empty'."

Comments?

• Senthil

Senthil Sengodan Nokia Research Center, Boston