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
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
Of course, you should process the message, anyway-- especially when building
----- 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,
> 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
> How should we resolve the inconsistency?
> - TLyons at sonusnet.com +1 732 625-3003 ext 212
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