I am not THE expert on these matters but it comes to play in my daily
duties
SIP is more flexible then H323 and H323 is a suite of protocols for real
time traffic, SIP is far more suitable when looking at unified messaging
Have a look at SMTP and then look at SIP ... you'll see some resemblance
The security issues with SIP are sadly far greater then H323
I can fwd a good link on that
regards
Haakon Claassen
EMEA - IT Transport Services -WAN
Cisco Systems
De Kleetlaan 6b - Pegasus Park
B-1831 Diegem (Belgium)
-----Original Message-----
From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
Sent: maandag 23 september 2002 20:45
To: [EMAIL PROTECTED]
Subject: Re: SIP vs H323 [7:53852]
In what ways was the SIP equipment better? The fact that it comes from a
"www/internet" IETF world, versus H.323 which comes from the ITU,
wouldn't
necessarily mean that it's better. In fact, to make a very broad
generalization, the IETF has historically been involved with data
networking
which hasn't been that concerned about quality. Reliability is
achieved, in
general, by the sender retransmitting if there's no ACK, which doesn't
work
with voice. Quality is achieved by various hacks. ;-)
At least in the U.S., our telephone networks have always been way more
reliable and offered better quality than our data networks, which have
been
annoyingly flaky. When we pick up a phone to make a call, unless it's
Mother's Day and all circuits are busy, it simply works. Problems are
rare.
Problems accessng data on intranets and the Internet are widespread. So
it
doesnt' fit with our paradign that you would think that SIP is better
because it comes from a "www/Internet" world.
SIP may be better because it's always easier to do something better the
second time around. SIP is newer. H.323 is old.
Anyway, this philosophical debate probably isn't that relevant, but
things
are slow today at work. ;-)
Priscilla
Gunjan Mathur wrote:
>
> I tested one SIP equipement of vonage, and that was
> far far better then any device using H323...that's the
> reason I want to know the diff in between these two.
> What I understand is SIP model works on www/internet
> and h323 model is telephony, I believe this is the
> main reason for the quality difference.
>
> What you suggest...
> TIA
>
> --- "Steven A. Ridder" wrote:
> > I agree that SIP is the future, it just isn't there
> > yet. There is some SIP
> > being built into Unity and CM, but until everything
> > is SIP (as opposed to
> > MGCP/H.323 and Skinny), it just isn't useful yet.
> >
> > I know that SIP is being deployed in SP networks,
> > and I have implemented it
> > in a Telco, but for enterprise, it's useless. I
> > can't wait til it is
> > developed and more mature.
> >
> >
> > ""Jason Weden"" wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > Ok, so SIP is nowhere near useless. It is being
> > used all over the place
> > and
> > > will eventually replace H.323. Telcos like Vonage
> > (which uses Cisco SIP
> > > equipment), deltathree, and Denwa are using it for
> > last mile telephony
> > > connectivity for residences and enterprises, and
> > WorldCom, after surfacing
> > > from its financial issues, will be using it on its
> > global network as well.
> > > Microsoft has built a SIP client into Windows XP
> > (Microsoft Messenger) and
> > > SIP is very flexible and extensible and the best
> > place to start is
> > > http://www.sipcenter.com. PBX manufacturers like
> > Mitel and Siemens have
> > > developed their PBX completely around SIP.
> > >
> > > To get back to Cisco (as this is a Cisco
> > newsgroup), Cisco has taken the
> > > time and $$ to start to develop SIP functionality
> > in its products despite
> > > the fact that it isn't need for AVVID at all.
> > Though their initial SIP
> > > focus is on carrier-class products (since that is
> > the logical choice --
> > see
> > > my list of companies above), my bet is that SIP
> > will surface as a more
> > > central part of the AVVID architecture for the
> > enterprise. A good Cisco
> > > link is here:
> > >
> >
>
http://www.cisco.com/warp/public/cc/techno/tyvdve/sip/prodlit/index.shtm
l
> > >
> > > or here (which displays more enterprise
> > scenarios):
> > >
> > >
> >
>
http://cisco.com/univercd/cc/td/doc/product/voice/sipsols/biggulp/index.
htm
> > > Regards,
> > >
> > > Jason
> [EMAIL PROTECTED]
>
>
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Message Posted at:
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