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.

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-----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