H.323 (8.1) Phase A - Call Setup
PeterP at vegastream.com
Fri Jul 20 09:05:20 EDT 2001
I forgot to say that I agree with your second paragraph with the proviso
that it might take more than 4 seconds to send the Alerting.
Call Proceeding is not a substitue for Alerting its just an indication that
the caller should not give up too quickly.
> -----Original Message-----
> From: Paul E. Jones [mailto:paulej at PACKETIZER.COM]
> Sent: 20 July 2001 12:48
> To: ITU-SG16 at mailbag.cps.INTEL.COM
> Subject: Re: H.323 (8.1) Phase A - Call Setup
> Alerting was the intent. Call Proceeding not produce a
> ringing sound in the
> caller's ear. H.323 devices have to be able to send an
> Alerting, though
> they're not required to do so if they can send a Connect
> within 4 second.
> The 4 seconds is the T303 timeout and the T303 timer is disabled when
> receiving Alerting, too... not just Call Proceeding.
> The ideas are related, but independent. What we have seen
> some folks do is
> send a Call Proceeding to the caller and then nothing else until the
> connect. The result is that the calling party hears silence
> for a very long
> time: that's not good.
> ----- Original Message -----
> From: "Peter Price" <PeterP at VEGASTREAM.COM>
> To: <ITU-SG16 at mailbag.cps.INTEL.COM>
> Sent: Friday, July 20, 2001 6:54 AM
> Subject: H.323 (8.1) Phase A - Call Setup
> > Hi folks,
> > I think I may have found some incorrect text in H.323 8.1
> > The same text appears in both V3 and V4 so I suspect nobody
> has commented
> > before.
> > In the paragraph beginning:
> > "An endpoint shall be capable of sending the Alerting message. ..."
> > it goes on to say:
> > "If an endpoint can respond to a Setup message with a Connect, Call
> > Proceeding, or Release Complete within 4 seconds, it is not
> required to
> > the Alerting message. An endpoint sending the Setup message
> can expect to
> > receive either an Alerting, Connect, Call Proceeding, or
> Release Complete
> > message within 4 seconds after successful transmission."
> > I believe the first sentence here should really be discussing the
> > requirement to send a Call Proceeding (not Alerting) message.
> > The period of 4 seconds in the last sentence is related to
> T303 which is
> > specifically terminated by a Call Proceeding message in
> order to extend
> > timeout for the sending endpoint.
> > I think the sentence should read:
> > "If an endpoint can respond to a Setup message with a
> Connect, Alerting,
> > Release Complete within 4 seconds, it is not required to
> send the Call
> > Proceeding message."
> > This is then consistent with the use of Call Proceeding described in
> > (second para).
> > Peter Price
> > For help on this mail list, send "HELP ITU-SG16" in a message to
> > listserv at mailbag.intel.com
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