Voice Over IP in UK

Author

Best Voip

ddd

2007-05-08, 7:11 am

Hi

We live in an area where ADSL is available (512/12), but we are a long way
from the excahnge, which is reducing our Upload speed. We can hear people,
but they have problems hearing us

Which VoIP needs the least Upload capacity to work very well?

Thanks folks

Herman

2007-05-08, 7:11 am

"ddd" <dddd.net> wrote in message
news:1178608924.55991.0@despina.uk.clara.net...
> Hi
>
> We live in an area where ADSL is available (512/12), but we are a long way
> from the excahnge, which is reducing our Upload speed. We can hear people,
> but they have problems hearing us
>
> Which VoIP needs the least Upload capacity to work very well?
>
> Thanks folks
>
In theory, any provider using SIP should be able to service with this
bandwidth. It all depends on the codec your equipment uses and your ITSP
supports (see http://www.en.voipforo.com/codec/codecs.php). However, at 12
Kbps, I could imagine that the quality would be pretty much unusable. Also,
there could be more chance of ADSL connection dropping. Bear in mind that
you would normally have to have at least 90 Kbps in both directions to have
quality comparable to a POTS service.

My advice is to try to play about with the codecs your equipment uses. If
calls cannot then be connected, it may be because your ITSP does not suport
that codec. If the calls do succeed, you need to make the decision whether
the quality is acceptable. My personal opinion (based on experience with
solely high speed connections) is that the quality will not be acceptable.

Paul Hayes

2007-05-08, 7:11 am

ddd wrote:
> Hi
>
> We live in an area where ADSL is available (512/12), but we are a long way
> from the excahnge, which is reducing our Upload speed. We can hear people,
> but they have problems hearing us
>
> Which VoIP needs the least Upload capacity to work very well?
>
> Thanks folks
>
>

Is that a typing error or are you really getting 12kbps upstream speed?
You wont get VoIP to work using such a slow speed no matter what you
do. G.729 requires about 30kbps in either direction for a slight
sacrifice in voice quality. In reality you'll probably need at least a
56kbps connection. You'll find most VoIP service providers support the
g729 codec and most commercial hardware does to. If you are using
Asterisk you'll have to buy licenses from Digium for about £20 each.

cheers,
Paul.

Panda

2007-05-08, 7:11 am

On May 8, 9:21 am, "ddd" <dddd.net> wrote:
> Hi
>
> We live in an area where ADSL is available (512/12), but we are a long way
> from the excahnge, which is reducing our Upload speed. We can hear people,
> but they have problems hearing us
>
> Which VoIP needs the least Upload capacity to work very well?
>
> Thanks folks

Hi,

Check the following link:
http://forums.networkingland.com/showthread.php?t=6158

for the exact bandwidth consumed by most VoIP codecs.

As you can see G.723 is the minimum among all with around 20Kbps over
all bandwidth consumption.

You must have some kind of QoS to get clear sound for both ends and
higher ADSL bandwidth other wise it's impossible to have decent VoIP.

Panda,
http://forums.networkingland.com

ddd

2007-05-08, 7:11 am

Sorry should be 128 up speed - theoretical

"ddd" <dddd.net> wrote in message
news:1178608924.55991.0@despina.uk.clara.net...
> Hi
>
> We live in an area where ADSL is available (512/12), but we are a long way
> from the excahnge, which is reducing our Upload speed. We can hear people,
> but they have problems hearing us
>
> Which VoIP needs the least Upload capacity to work very well?
>
> Thanks folks
>
>

ddd

2007-05-08, 7:11 am

What do people think of the www.testyourvoip.com for testing quality

These are my results

Time Source IP Target Codec MOS To MOS From
05/08/07 07:00 AM EDT 91.184.192.3 London G.711 4.0 4.4
05/08/07 06:59 AM EDT 91.184.192.3 Helsinki G.711 3.8 4.1
05/08/07 06:58 AM EDT 91.184.192.3 London G.711 3.4 4.3
05/08/07 06:55 AM EDT 91.184.192.3 London G.711 3.5 4.3
05/08/07 06:54 AM EDT 91.184.192.3 London G.711 3.8 4.3
05/08/07 02:42 AM EDT 91.184.192.3 London G.711 3.8 3.9
05/04/07 12:53 AM EDT 91.184.192.3 London G.711 3.3 3.7
05/04/07 12:52 AM EDT 91.184.192.3 Helsinki G.711 4.2 3.7
05/04/07 12:52 AM EDT 91.184.192.3 London G.711 2.8 3.8
05/04/07 12:51 AM EDT 91.184.192.3 London G.711 3.4 3.5
05/03/07 03:17 AM EDT 91.184.192.3 London G.729 3.2 3.9
05/03/07 03:16 AM EDT 91.184.192.3 Sydney G.711 2.6 2.1
05/03/07 03:16 AM EDT 91.184.192.3 London G.711 3.7 4.2
05/03/07 03:13 AM EDT 91.184.192.3 London G.711 3.3 3.5
05/03/07 03:11 AM EDT 91.184.192.3 London G.711 3.2 3.6
05/03/07 03:09 AM EDT 91.184.192.3 London G.711 2.9 3.8
05/03/07 03:08 AM EDT 91.184.192.3 London G.711 2.6 4.1
04/30/07 10:02 AM EDT 91.184.192.3 London G.711 1.2 1.9
04/30/07 10:01 AM EDT 91.184.192.3 London G.711 1.3 2.1
04/30/07 10:00 AM EDT 91.184.192.3 London G.711 3.0 3.9
04/30/07 09:59 AM EDT 91.184.192.3 London G.711 2.6 3.8
04/30/07 09:58 AM EDT 91.184.192.3 London G.711 3.9 4.2
04/30/07 09:56 AM EDT 82.214.223.1 London G.711 1.9 2.1
04/30/07 09:55 AM EDT 82.214.223.1 London G.711 2.6 2.7
04/30/07 09:17 AM EDT 91.184.192.3 London G.711 3.9 4.1
04/30/07 09:16 AM EDT 91.184.192.3 London G.711 3.2 3.9
04/30/07 09:15 AM EDT 91.184.192.3 London G.711 3.6 3.8
04/30/07 09:10 AM EDT 91.184.192.3 London G.711 1.2 1.4
04/30/07 09:01 AM EDT 91.184.192.3 London G.711 1.1 2.3
04/30/07 08:59 AM EDT 91.184.192.3 London G.711 4.2 4.4
04/30/07 08:45 AM EDT 91.184.192.3 London G.711 3.8 3.8
04/30/07 08:37 AM EDT 91.184.192.3 London G.711 3.9 4.1
04/30/07 08:35 AM EDT 91.184.192.3 London G.711 3.8 3.9
04/30/07 08:17 AM EDT 91.184.192.3 London G.711 3.7 4.2
04/30/07 08:16 AM EDT 91.184.192.3 London G.711 3.5 4.0
04/30/07 08:13 AM EDT 91.184.192.3 London G.711 3.8 3.9
04/30/07 08:11 AM EDT 91.184.192.3 London G.711 4.0 4.0

Paul Hayes

2007-05-08, 7:11 am

ddd wrote:
> Sorry should be 128 up speed - theoretical
>
> "ddd" <dddd.net> wrote in message
> news:1178608924.55991.0@despina.uk.clara.net...
>
>

OK, I thought as much. I guess you aren't actually getting that speed.
Try using g729 codec for a bit and see if it makes a difference.

Implementing QoS might be necessary too if you have other applications
using the Internet connection at the same time.

cheers,
Paul.

ddd

2007-05-08, 7:11 am

At the moment I am trying Tesco Internet Phone. Can the codec be changed
with this?
"Paul Hayes" <nomailforme@polog40.org.uk> wrote in message
news:46406169$0$646$5a6aecb4@news.aaisp.net.uk...
> ddd wrote:
>
> OK, I thought as much. I guess you aren't actually getting that speed.
> Try using g729 codec for a bit and see if it makes a difference.
>
> Implementing QoS might be necessary too if you have other applications
> using the Internet connection at the same time.
>
> cheers,
> Paul.
>

News Reader

2007-05-08, 1:11 pm

News Reader

2007-05-08, 7:11 pm

"News Reader" <no@email.invalid> wrote in message
news:f1q97r$rv0$1@inews.gazeta.pl...
>
> "ddd" <dddd.net> wrote in message
> news:1178608924.55991.0@despina.uk.clara.net...
>
> Hi,
>
>
> Can I suggest you trying going to www.speedtest.com and report the results
> to us.
>
> Please ensure that nothing / no one else is using the internet /
> connection at the time.
>
> Thanks.
>
>
> Best wishes,
>
>
>
> News Reader
>
>
>

Hi,

Ooopppss.... www.speedtest.net

Thanks,

News Reader

ddd

2007-05-09, 1:11 am

422 kb/s down

43 kb/s up

Hope that helps

Thanks

News Reader

2007-05-09, 1:11 pm

"ddd" <dddd.net> wrote in message
news:1178686066.15339.0@despina.uk.clara.net...
> 422 kb/s down
>
> 43 kb/s up
>
> Hope that helps
>
> Thanks
>

Hi,

Yep... you are right on the limit their with your upstream. I don't know if
you may be able to change away from RADSL (i.e. not have rate adaptive adsl
which reduces upstream to maximise downstream) or try a 256kbp/s type
service which should help maintain / support better upstream.

Anyhow, that would require a deal more consideration, discussion,
investigation, etc.

Turning to the key point. At 43 k you are on the limit - iLBC or Speex (or
possibly GSM or G.729) (I think they are) might just fit - but you have to
allow 10% on either side for protocol overhead, packet headers, etc.

The list a fellow poster suggested seems very good for showing you this:

http://www.en.voipforo.com:80/codec/codecs.php

(You will see that quite a few will fit within your [call it a "working"] 35
kbps)

I can't claim to know a great deal about Tesco Internet Phone services...
but generally the more "branded" or packaged services tend not to allow so
much low level configuration or setting adjustment. However, some do! You
could look in the user manuals or any accompanying software for "low
bandwidth" or similar options (perhaps some might mention for use with low
bandwidth dial-up 56k modems). Otherwise, I understand that you can use the
physical Tesco Internet Phone with other software / softphones (such as the
very good X-Lite software - I believe / understand) and then you can choose
one of many very good providers (telecoms side providers) and they will
mostly support a range of codecs - typically including the more common g*
series of codecs and sometimes iLBC and speex, etc. You can always
experiment for free using X-Lite and various free test numbers (you do not
have to even register with any to call them and you can try turning on / off
different codecs in X-Lite and see what works well - perhaps for example,
using a free VoIP echo test number, etc.).

Hope some of this is some use - at least to give you a bit more information
or to get you started.

I am sure others here and elsewhere would be able to help you further as
well

.

Best wishes,

News Reader

News Reader

2007-05-09, 1:11 pm

"News Reader" <no@email.invalid> wrote in message
news:f1sup1$kgh$1@inews.gazeta.pl...
>
> "ddd" <dddd.net> wrote in message
> news:1178686066.15339.0@despina.uk.clara.net...
>
>
> Hi,
>
>
> Yep... you are right on the limit their with your upstream. I don't know
> if you may be able to change away from RADSL (i.e. not have rate adaptive
> adsl which reduces upstream to maximise downstream) or try a 256kbp/s type
> service which should help maintain /

<SNIP>

>
> Best wishes,
>
>
>
> News Reader
>
>
>

P.s. It might be a good idea to double check with your ISP that this is a
genuine issue of line length and not for example capacity problems on their
side, etc.

Hongtian

2007-05-10, 7:11 am

On 8 May, 15:21, "ddd" <dddd.net> wrote:
> Hi
>
> We live in an area where ADSL is available (512/12), but we are a long way
> from the excahnge, which is reducing our Upload speed. We can hear people,
> but they have problems hearing us
>
> Which VoIP needs the least Upload capacity to work very well?
>
> Thanks folks

I think iLBC or SpeeX codec can fit your requirement, but it depends
on whether your SIP softphone or SIP client can support it or not.

Hongtian

2007-05-10, 7:11 am

On 8 May, 15:21, "ddd" <dddd.net> wrote:
> Hi
>
> We live in an area where ADSL is available (512/12), but we are a long way
> from the excahnge, which is reducing our Upload speed. We can hear people,
> but they have problems hearing us
>
> Which VoIP needs the least Upload capacity to work very well?
>
> Thanks folks

If your SIP softphone can support iLBC or SpeeX but your SIP provider
cannot support them, I think you have to establish your own VOIP
environment. In this case, Asterisk or miniSipServer is a good choice.