Randy,
I agree, it has gone on too long, but... :-)
Exactly, you've made my point for me!
1. One cannot send SETUP to a v1 or v2 EP with the octet-3 extension bit of calling party number set to 0, because H.225.0 v1 and v2 says that it shall be set to 1.
2. An H.323 entity cannot know (through in-band means) the version of the destination EP before it sends SETUP.
3. Therefore, an entity can never send SETUP to an EP with the extension bit set to 0 and octet 3a present.
I don't know how to make it any clearer. Either nobody understands what I'm saying, or they do but really really REALLY want to use octet 3a "the way God intended it to be used" :-) regardless of whether it violates some revisions of H.225.0 and risks breaking compliant implementations. I believe the latter is the case, but nobody wants to admit it.
Paul Long Smith Micro Software, Inc.
-----Original Message----- From: Wuerfel, Randy P [SMTP:Randy.P.Wuerfel@ICN.SIEMENS.COM] Sent: Friday, May 14, 1999 10:18 AM To: ITU-SG16@MAILBAG.INTEL.COM Subject: Re: caller ID and implementer's guide
Perhaps this discussion has gone on too long, however I just wanted to point out that when Paul uses the phrase "an EP cannot send a SETUP message to a v1 or v2 EP ...", the phrase has no meaning (at least to me). We support users (people!) on our H.323 system that register with a GK. The users are mobile, and can thus register from any EP. Thus, when I initiate a call, my ARQ indicates a destinationInfo alias address of a user that may at that moment be using any type of an EP. Since my EP doesn't attempt to match a transport address with an EP type (which would be a triviality anyway), I have no idea of the EP type (v1, v2 or in the future v3) when I send the Setup message.
Don't I need an H.225.0 message returned from the destination EP before I can determine its type?
Please consider the proposals that Karl Klaghofer has made to resolve this issue in Santiago.
========================================================== Randy Wuerfel IP/Data Networks Development Unisphere Solutions, Inc. E-mail: Randy.P.Wuerfel@icn.siemens.com 4900 Old Ironsides Drive Fax: (408) 492-4666 M/S 200 Tel: (408) 492-4375 P.O. Box 58075 Santa Clara, CA 95052-8075