Hi Vivek

The only function of TPKT is to define message boundaries. Annex E has own mechanisms to do this. So basically I think that should be no TPKT header in the Q.931 messages when used with Annex E.

Sasha

-----Original Message----- From: Vivek Kakkar [mailto:vkakkar@CISCO.COM] Sent: Thursday, September 13, 2001 11:19 AM To: ITU-SG16@MAILBAG.INTEL.COM Subject: H323 Annex E over UDP and TPKT header

Hello, I wanted to poll the H323 community regarding the use of TPKT header with H225 message while using AnnexE transport capability. AnnexE makes the UDP a reliable signaling channel. H.323 spec talks of using TPKT header with reliable signaling channel.

What is your interpretation of H323/AnnexE regarding the TPKT header? Does the TPKT header have a function in this case?

thanks,

-- vivek

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Vivek Kakkar Cisco Systems, Inc.

vkakkar@cisco.com Research Triangle Park, NC

919-392-6975:o USA