Conflicting text in H.323 concerning the requirement for esta blishing a H.245 control channel??

[Agboh, Charles]

Chris,

Part of  establishing a "point-to-point" call involves opening 2 TCP
connnections using the Fast Connect procedure as you described it.  If that
is the case, then the extract from H.323v2 below is misleading(I believe).

H.323v2: 8.1.7 Fast Connect Procedure

"..... The Fast Connect procedure allows the endpoints to establish a basic
point-to-point call with as few as one round-trip message exchange, enabling
immediate media stream delivery upon call connection."

BR,
Charles
> -----Original Message-----
> From: Chris Wayman Purvis [mailto:cwp at ISDN-COMMS.CO.UK]
> Sent: Tuesday, March 20, 2001 5:47 PM
> To: ITU-SG16 at MAILBAG.INTEL.COM
> Subject: Re: Conflicting text in H.323 concerning the requirement for
> esta blishing a H.245 control channel??
>
>
> Charles,
>
> It does NOT defeat ANY of the stated aims of FastConnect.
> These aims were to get agreed media channels in both
> directions open as
> quickly as possible.  Doing FastStart AND H.245 gives you your media
> quickly, and means you have the power of H.245 thereon.
>
> In-band DTMF transfer may be used.  If you happen to be using
> a codec that
> supports it.  If you assume it when you're using an
> unsuitable codec you'll
> have a problem.  Which is a reason for using H.245 capability
> negotiation.
>
> Regards,
> Chris
>
> Agboh, Charles wrote:
>
> > which defeats the whole point of having a Fast Connect
> procedure (FS +
> > H.245).  Why isn't in-band- DTMF transfer used instead (in FS)?
> >
> > -Charles
> >
> >
> >> -----Original Message-----
> >> From: Frank Derks [mailto:frank.derks at PHILIPS.COM]
> >> Sent: Tuesday, March 20, 2001 4:40 PM
> >> To: ITU-SG16 at MAILBAG.INTEL.COM
> >> Subject: Re: Conflicting text in H.323 concerning the
> requirement for
> >> establishing a H.245 control channel??
> >>
> >>
> >> Chris,
> >>
> >> I thought I was being clear enough, so let me try again.
> >> 6.2.8/H.323 states
> >> that an enpoint must open one (and exactly one) H.245 control
> >> channel. When
> >> Fast Connect is being used, I assume that the intention is
> >> that no such control
> >> channel is opened.
> >>
> >> To be compliant with 6.2.8/H,323 I would have to open a H.245
> >> control channel
> >> irrespective of which type of H.245 procedures I will be
> >> using. So if I intend
> >> to use Fast Start (and assuming that the other party also
> >> supports this), I
> >> still have to open a H.245 control channel.
> >>
> >> Frank
> >>
> >>
> >>
> >>
> >>
> >>
> >> cwp at isdn-comms.co.uk on 20-03-2001 15:17:14
> >> To:     Frank Derks/HVS/BE/PHILIPS at EMEA2
> >> cc:     ITU-SG16 at mailbag.cps.INTEL.COM@SMTP
> >> Subject:        Re: Conflicting text in H.323 concerning the
> >> requirement for establishing a H.245 control channel??
> >> Classification:
> >>
> >> Frank,
> >>
> >> Why do you consider this text to be "conflicting"?
> >> Specifically, with what does it conflict?
> >>
> >> Regards,
> >> Chris
> >>
> >>
> >>> 6.2.8/H.323 states: "The endpoint shall establish exactly
> one H.245
> >>> Control Channel for each call that the endpoint is
> >>
> >> participating in."
> >>
> >>> 8.1.7/H.323 never states that when Fast Connect is being
> used such a
> >>> control channel should be established. As far as I understand the
> >>> mechanism this is only required to switch to "normal" H.245
> >>
> >> procedures.
> >>
> >>> It would seem that section 6.2.8 should be rephrased to
> >>
> >> make clear that
> >>
> >>> the H.245 control channel shall only be established when
> >>
> >> "normal" H.245
> >>
> >>> procedures are being followed and not in the fast connect case.
> >>>
> >>> Frank
> >>
> >> --
> >> Dr Chris Purvis -- Development Manager
> >> ISDN Communications Ltd, The Stable Block, Ronans, Chavey Down Road
> >> Winkfield Row, Berkshire.  RG42 6LY  ENGLAND
> >> Phone: +44 1344 899 007
> >> Fax:   +44 1344 899 001
> >>
> >>
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> >> For help on this mail list, send "HELP ITU-SG16" in a message to
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> >>
> >
> >
> >
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>
> --
> Dr Chris Purvis -- Development Manager
> ISDN Communications Ltd, The Stable Block, Ronans, Chavey Down Road
> Winkfield Row, Berkshire.  RG42 6LY  ENGLAND
> Phone: +44 1344 899 007
> Fax:   +44 1344 899 001
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> For help on this mail list, send "HELP ITU-SG16" in a message to
> listserv at mailbag.intel.com
>

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