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@SONUSNET.COM> To: <ITU-SG16@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@sonusnet.com +1 732 625-3003 ext 212

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