Re: VOIP FXS Gateways that support SIP

["Dan" <dtoma@xxxxxxx>]

Hi Ian,

> Surely SIP is also the transport protocol as well as Signalling or am
I
missing something :-)
RTP is used for transport.. SIP is used only for signaling (as I know)..
Some other opinions here?

Dan
----- Original Message -----
From: "Ian Willoughby" <ian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 02, 2003 11:59 AM
Subject: RE: [ukha_d] VOIP FXS Gateways that support SIP


>
> Hi Dan,
>
> Not being the one who made the tests, I can't say for sure but it
looks
like they were talking about CSICO kit and probably the scale of there test
was larger than I would ever dream of using from home anyway. I agree it
does sound like different codec's were used. Surely SIP is also the
transport protocol as well as Signalling or am I missing something :-)
>
> It looks like I will plump for one of the Pheenet gateways, I like the
look of the rack mount version but it works out quite expensive, the specs
look very impressive though.
>
> R's
> Ian
>
>
> -----Original Message-----
> From: Dan [mailto:dtoma@xxxxxxx]
> Sent: Fri 02/05/2003 09:49
> To: ukha_d@xxxxxxx
> Cc:
> Subject: Re: [ukha_d] VOIP FXS Gateways that support SIP
>
>
>
> Hi Ian,
>
> > Cr*p means very poor speach quality even at quite low
compressions.
> SIP is just a signaling protocol, so the speech quality depend ONLY on
the
> codec!.
> So if you have the same codecs for both (H.323 and SIP) on the same
device,
> then the quality pf the speech is the same.
> If you compare different SIP phones with H.323 phones then you can
have
> difference in speech quality because of the different implementations
of
the
> same codec.
>
> I just make some tests on Cisco ATA-186 (both SIP and H.323) and there
is
no
> difference in speech quality between them for the same codec.
>
> Do not forget the quality of the gateways used, if any....
>
> BR,
> Dan
>
> ----- Original Message -----
> From: "Ian Willoughby" <ian@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, May 02, 2003 11:21 AM
> Subject: RE: [ukha_d] VOIP FXS Gateways that support SIP
>
>
> >
> > Just got this response from Solwise, I really do love Solwise
honesty,
> they are one of the few companies that are a real pleasure to do
business
> with :-
> >
> > I now have SIP firmware for ALL the pheenet gateways.
> >
> > I'm just doing a bit of testing and then I'll post it on our
downloads
> site.
> >
> > Cr*p means very poor speach quality even at quite low
compressions.
Tests
> carried out by one of our punters (very large VoIP carrier - like the
> largest in Europe) showed that H.323 running at a 10K compressed codec
out
> performed SIP running at 32K compression. i.e. the H.323 produced
better
> results and only used one third of the bandwidth. Now maybe 32K
doesn't
> sound bad but remember your ADSL upstream is only 256K so get a few
VoIP
> calls going with SIP and you might start to get problems.
> >
> > Don't get me wrong here.... With MS and Cisco behind it (bl**dy
'ell
cisco
> make rubbish voip kit!) SIP is obviously going to get better but I
just
get
> the impression that, like all MS stuff, it's been launched maybe a
couple
of
> years too soon. Let's face it, after 18 months XP is just starting to
get
> useable (I'm still sticking with win2k for a bit longer). :-)
> >
> > R's
> > Ian
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
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