Is H.225.0 Progress message really optional though it is used in Fast Start ?

Paul E. Jones paulej at PACKETIZER.COM
Fri Oct 5 04:18:50 EDT 2001


Terry,

Since Fast Connect information may be contained in a Progress message, that
constitutes a "feature that uses these messages".  As explained in the
footnote in H.225.0v4, usage of such features makes the message mandatory to
process.

Of course, you should process the message, anyway-- especially when building
GWs.

Paul

----- Original Message -----
From: "Lyons, Terry" <TLyons at SONUSNET.COM>
To: <ITU-SG16 at mailbag.cps.INTEL.COM>
Sent: Friday, September 28, 2001 10:27 AM
Subject: Is H.225.0 Progress message really optional though it is used in
Fast Start ?


> H.323 v4 says:
> 8.1.7   Fast connect procedure
> . . .  When the called endpoint desires to proceed with the Fast Connect
> procedure, it sends a Q.931 message (Call Proceeding, Progress, Alerting,
or
> Connect) containing a fastStart element selecting from amongst the
> OpenLogicalChannel proposals offered by the calling endpoint.
>
> However, H.225.0 says that Progress is CM to receive and act on.
> Does that mean that a receiver can ignore Progress and believe that Fast
> Start was refused?
> The transmitter and receiver can then disagree about whether Fast Start
> concluded.
>
> How should we resolve the inconsistency?
>
> - TLyons at sonusnet.com  +1 732 625-3003 ext 212
>
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