TPKT is a necessary addition to TCP-based messaging, to provide advance delineation of individual messages. TCP by itself doesn't do this very well, since it is stream-oriented. See RFC 1006 as you indicate.

-----Original Message----- From: Derks, Frank [SMTP:F.Derks@PBC.BE.PHILIPS.COM] Sent: Monday, February 01, 1999 12:31 PM To: ITU-SG16@MAILBAG.INTEL.COM Subject: TPKT in H.225.0

I am trying to make some sense out of H.225.0. Section 6.1 (in versions 2 and 3) refers twice to TPKT: "In IP implementations as outlined in Appendix D, this packet is defined by TPKT". Appendix D shows an unnumbered figure that indeed has the acronym "TPKT" in it. However, from this it is still not quite clear what TPKT is. What is the purpose of mentioning it 6.1 if it is not specified/explained anyway? If TPKT is nothing else than one (whole) Q.931/H.245 PER encoded message (pre-pended with the relevant Q.931 fields in the case of "Q.931") then the recommendation could be less ambiguous about it. The reference to the appendix leads one to believe that further inofrmation can be found there, whereas the preceding text already explains what TPKT is.

Furthermore, the list of abbreviations does not list it either.

Regards,

Frank

P.S.

Does this "TPKT" have anything to do with "TPKT" as used in RFC1006?

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Frank Derks |Tel +31 35 6893238 | Advanced Development |Fax +31 35 6891030 | Philip Business Communications |P.O. Box 32 | |1200 JD Hilversum | |The Netherlands | ----------------------------------------------------| E-mail: mailto:f.derks@pbc.be.philips.com | WWW: http://www.business-comms.be.philips.com |

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