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Home > Archive > Voice Over IP in UK > June 2005 > SIP/ATA/Adapter and Quality of Service (QoS)
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| Author |
SIP/ATA/Adapter and Quality of Service (QoS)
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| Paul D.Smith 2005-06-07, 2:45 am |
| Any tech-heads out there? Am I correct in assuming that the correct setup
for a VoIP/Internet ADSL system is the following?
modem --- VoIP adapter --- router
This allows the VoIP adapter to perform QoS processing and effectively limit
Internet traffic to/from the router to ensure that the quality of the VoIP
call is not affected?
Presumably the following...
modem --- router --- VoIP adapter
....can be prone to break up if people start heavy surfing and downloads
whilst you're on the phone.
And if this is the case, how come nobody sells a combined modem/VoIP/router
that works like this? The latest Netgear offering is a case in point - it
doesn't integrate will with the very popular DG384G(T) models.
Paul DS.
--
Please remove the "x-" if replying to sender.
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| Ivor Jones 2005-06-07, 7:45 am |
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"Paul D.Smith" <paul_d_smith@x-hotmail.com> wrote in message
news:42a556a2$0$293$ed9e5944@reading.news.pipex.net...
> Any tech-heads out there? Am I correct in assuming that the correct
> setup
> for a VoIP/Internet ADSL system is the following?
>
> modem --- VoIP adapter --- router
Not necessarily, it depends on the ATA. Some are designed to plug into an
existing router (eg Sipura SPA-2000). Those that connect directly to a
modem will contain their own router so you should not plug another router
into them, or the two may conflict. You can plug a normal Ethernet switch
in though.
> This allows the VoIP adapter to perform QoS processing and effectively
> limit
> Internet traffic to/from the router to ensure that the quality of the
> VoIP
> call is not affected?
>
> Presumably the following...
>
> modem --- router --- VoIP adapter
>
> ...can be prone to break up if people start heavy surfing and downloads
> whilst you're on the phone.
Yes, this can happen, but only if you're approaching your upload/download
limits.
> And if this is the case, how come nobody sells a combined
> modem/VoIP/router
> that works like this? The latest Netgear offering is a case in point -
> it
> doesn't integrate will with the very popular DG384G(T) models.
Which Netgear "offering" are you referring to..? The TA612V..?
There are devices that combine a modem, router and VoIP adaptor but
they're not common at present. Draytek do one I believe but it's not
cheap..! AVM also have one on the market in Germany but it isn't on sale
in the UK yet, although it should be within a month or so.
Ivor
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| Paul D.Smith 2005-06-07, 7:45 am |
| <snip>
....You can plug a normal Ethernet switch in though.
Good point. Many people might be like me and have a router already though,
but not a switch.
> Yes, this can happen, but only if you're approaching your upload/download
> limits.
Which is the point. I have a 512kB ADSL connection. VoIP (G.711) requires
about 80kB and I believe upload speeds are only about 128kB for ADSL
connections. Plus, if the upstream allows, even a webpage download could
hit the max value resulting is break-up of the VoIP. By using QoS, the
network should adapt to restrict the non-VoIP traffic.
> Which Netgear "offering" are you referring to..? The TA612V..?
Yes. Hadn't got the model number to hand.
>
> There are devices that combine a modem, router and VoIP adaptor but
> they're not common at present. Draytek do one I believe but it's not
> cheap..! AVM also have one on the market in Germany but it isn't on sale
> in the UK yet, although it should be within a month or so.
>
Look forward to seeing them.
Paul DS
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| On Tue, 7 Jun 2005 13:38:47 +0100, Paul D.Smith
<paul_d_smith@x-hotmail.com> wrote:
> Which is the point. I have a 512kB ADSL connection. VoIP (G.711) requires
> about 80kB and I believe upload speeds are only about 128kB for ADSL
> connections.
If it's a "supplied over BT" system like msot dsl, then it's upstream is
256K.
Chloe
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| Ivor Jones 2005-06-07, 8:45 pm |
|
"Paul D.Smith" <paul_d_smith@x-hotmail.com> wrote in message
news:42a59559$0$302$ed9e5944@reading.news.pipex.net...
> <snip>
>
> ...You can plug a normal Ethernet switch in though.
>
> Good point. Many people might be like me and have a router already
> though,
> but not a switch.
Linksys do 5 and 8 port switches quite cheaply, I have a couple that work
well.
>
> Which is the point. I have a 512kB ADSL connection. VoIP (G.711)
> requires
> about 80kB and I believe upload speeds are only about 128kB for ADSL
> connections. Plus, if the upstream allows, even a webpage download
> could
> hit the max value resulting is break-up of the VoIP. By using QoS, the
> network should adapt to restrict the non-VoIP traffic.
Depends who your ISP is. I am on Wanadoo (Freeserve that was) and I was
initially on a 512 connection but upgraded to 1MB. The uplink has always
been 256k.
>
> Yes. Hadn't got the model number to hand.
A couple of friends have them and they seem to work well.
>
> Look forward to seeing them.
Check the Sipgate website shop in a month or so.
Ivor
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| Martin² 2005-06-07, 8:45 pm |
| Paul D. Smith:
> how come nobody sells a combined modem/VoIP/router
There are quite number available:
Draytek Vigor 2100V, 2500V, 2600V, 2600VG
Zyxel 2602HW & Zyxel 2602HWL
Zoom X5
The Vigor range is quality kit, well proven, hence not cheap.
I will be installing the brand new on the market Zyxel 2602HWL on Saturday,
on paper the best and only £159.04 from broadbandbuyer.co.uk.
I have no experience with the Zoom X5V, (but X4 was fine)..
Regards,
Martin
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| On Tue, 7 Jun 2005 13:38:47 +0100, Paul D.Smith wrote:
>Good point. Many people might be like me and have a router already though,
>but not a switch.
Surely if you have a router/switch then you can effectively disable
the "router" function and use it as if it were just a switch?
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| Paul D.Smith 2005-06-08, 2:45 am |
| "Al" <e@aa.invalid> wrote in message
news:bf6da1h78j2av4lqt8nvbqo6dhj99o7tng@
4ax.com...
> On Tue, 7 Jun 2005 13:38:47 +0100, Paul D.Smith wrote:
>
though,[vbcol=seagreen]
>
> Surely if you have a router/switch then you can effectively disable
> the "router" function and use it as if it were just a switch?
>
True, providing I have a router that has a "uplink" switch, or
auto-switches, or have a cross-over cable from router to ATA.
Paul DS.
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| Philippe Deleye 2005-06-11, 5:45 pm |
| > > There are devices that combine a modem, router and VoIP adaptor but[vbcol=seagreen]
There are plenty for sale on e-bay
Do a search for "AVM Fritz!Box Fon WLAN 7050"
For a succesful bid you must go up to 170-180?
New they cost about 249?
It is a combined DSL modem, router, wireless acces point, Voip adapter and
ISDN switchbox
(can be plugged into a analogue *or* ISDN line (not both), has 3 internal
analoge phone connections and 1 internal ISDN So)
rgds
Philippe
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| Martin² 2005-06-11, 8:45 pm |
| Just bought and installed Zyxel 2602HWL, brand NEW on the market.
Two VoIP ports, different registrars and pass trough to POTS landline too.
QoS of course.
WIFI too.
It's £160 all in from broadbanduyer.co.uk and I recon they have made mistake
with the price,
co's it's cheaper then the HW version which hasn't got the landline
pass-through ;-)
Early days but seems fine so far.
Regards,
Martin
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