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