Using VOIP as an audio route.

I have an application where I need to be able to send audio from A to
B about 40 miles apart. There is no audio circuit between the sites
but there is a (fairly) high capacity data circuit.

Does anyone know if there is a simple and inexpensive interface box on
the lines of an ATA that can talk to another box of the same type over
the data circuit usingVOIP-type operation? Ideally I could do with it
being four-wire presentation - that is seperate 600R go and return
audio at each end - but two-wire presentation will do at a push.

Any help gratefully received.


--
Woody

harrogate3 at ntlworld dot com

harrogate3 wrote:
> I have an application where I need to be able to send audio from A to
> B about 40 miles apart. There is no audio circuit between the sites
> but there is a (fairly) high capacity data circuit.
>

I would use a pair of Snom370s and connect to the headset ports to get
your audio.

Reason for this is that Snom370 support G.722 wide band audio, so will
give you the best audio quality.

I can't think of a better way of doing it without buying broadcast sound
style encoders and decoders. Mega bucks.


Tim

"Tim" <nutnews@kooky.org> wrote in message
news:46ead764$0$654$bed64819@news.gradwell.net...
> harrogate3 wrote:
> > I have an application where I need to be able to send audio from A
to
> > B about 40 miles apart. There is no audio circuit between the
sites
> > but there is a (fairly) high capacity data circuit.
> >
>
> I would use a pair of Snom370s and connect to the headset ports to
get
> your audio.
>
> Reason for this is that Snom370 support G.722 wide band audio, so
will
> give you the best audio quality.
>
> I can't think of a better way of doing it without buying broadcast
sound
> style encoders and decoders. Mega bucks.
>
>
> Tim
>

Thanks for the reply gents, but I suspect you have misunderstood my
requirement. I very specifically do NOT want any form of dial-up
circuit. The line must be end-to-end permanently open - just like a BT
private wire which would cost a fortune. Presentation should ideally
be 600R floating or balanced.

I suppose I really need some form of single line mux.


--
Woody

harrogate3 at ntlworld dot com

harrogate3 wrote:
> Thanks for the reply gents, but I suspect you have misunderstood my
> requirement. I very specifically do NOT want any form of dial-up
> circuit. The line must be end-to-end permanently open - just like a BT
> private wire which would cost a fortune. Presentation should ideally
> be 600R floating or balanced.

That was my understanding of what you wanted.

Tim

"harrogate3" <nospam3@ntlworld.com> wrote in message
news:LUAGi.29464$ka7.21918@newsfe4-gui.ntli.net...
>
> "Tim" <nutnews@kooky.org> wrote in message
> news:46ead764$0$654$bed64819@news.gradwell.net...
> > harrogate3 wrote:
> > > I have an application where I need to be able to send audio from A
> to
> > > B about 40 miles apart. There is no audio circuit between the
> sites
> > > but there is a (fairly) high capacity data circuit.
> > >
> >
> > I would use a pair of Snom370s and connect to the headset ports to
> get
> > your audio.
> >
> > Reason for this is that Snom370 support G.722 wide band audio, so
> will
> > give you the best audio quality.
> >
> > I can't think of a better way of doing it without buying broadcast
> sound
> > style encoders and decoders. Mega bucks.
> >
> >
> > Tim
> >
>
> Thanks for the reply gents, but I suspect you have misunderstood my
> requirement. I very specifically do NOT want any form of dial-up
> circuit. The line must be end-to-end permanently open - just like a BT
> private wire which would cost a fortune. Presentation should ideally
> be 600R floating or balanced.

if you have PBXes (or the IP equivalent) then you may be able to program a
fixed link between them - cost approx zero....

"real" IP audio codecs are not cheap (for some definition of cheap of
course) - these are usually stereo (at least) and 15 or 22 KHz audio
channel.

They also tend to eat bandwidth, so you should check how much you are
willing to use.

as an example, you are going to need 400 Kbps+ to get 16 bit sampled stereo
using enhanced APTX compression (which is what a lot of radio broadcasters
seem to use)

www.broadcom.co.uk is 1 source we have used.

if codecs are a bit steep then esp if you have a typical corporate network,
some cisco router models can take analog speech interfaces - set them up to
do point to point permanent G.711 and you get 3.5 Hkz / 8 bit sampled sound

this could still run out several £100 when you add voice grade feature upgra
des for the routers, voice interfaces and DSPs - but 2nd and more channels
will be cheaper.....
>
> I suppose I really need some form of single line mux.
>
>
> --
> Woody
>
> harrogate3 at ntlworld dot com
--
Regards

stephen_hope@xyzworld.com - replace xyz with ntl

"stephen" <stephen_hope@xyzworld.com> wrote in message
news:qNVGi.59294$h11.38866@newsfe7-gui.ntli.net...
> "harrogate3" <nospam3@ntlworld.com> wrote in message
> news:LUAGi.29464$ka7.21918@newsfe4-gui.ntli.net...
> >
> > "Tim" <nutnews@kooky.org> wrote in message
> > news:46ead764$0$654$bed64819@news.gradwell.net...
> > > harrogate3 wrote:
> > > > I have an application where I need to be able to send audio
from A
> > to
> > > > B about 40 miles apart. There is no audio circuit between the
> > sites
> > > > but there is a (fairly) high capacity data circuit.
> > > >
> > >
> > > I would use a pair of Snom370s and connect to the headset ports
to
> > get
> > > your audio.
> > >
> > > Reason for this is that Snom370 support G.722 wide band audio,
so
> > will
> > > give you the best audio quality.
> > >
> > > I can't think of a better way of doing it without buying
broadcast
> > sound
> > > style encoders and decoders. Mega bucks.
> > >
> > >
> > > Tim
> > >
> >
> > Thanks for the reply gents, but I suspect you have misunderstood
my
> > requirement. I very specifically do NOT want any form of dial-up
> > circuit. The line must be end-to-end permanently open - just like
a BT
> > private wire which would cost a fortune. Presentation should
ideally
> > be 600R floating or balanced.
>
> if you have PBXes (or the IP equivalent) then you may be able to
program a
> fixed link between them - cost approx zero....
>
> "real" IP audio codecs are not cheap (for some definition of cheap
of
> course) - these are usually stereo (at least) and 15 or 22 KHz audio
> channel.
>
> They also tend to eat bandwidth, so you should check how much you
are
> willing to use.
>
> as an example, you are going to need 400 Kbps+ to get 16 bit sampled
stereo
> using enhanced APTX compression (which is what a lot of radio
broadcasters
> seem to use)
>
> www.broadcom.co.uk is 1 source we have used.
>
> if codecs are a bit steep then esp if you have a typical corporate
network,
> some cisco router models can take analog speech interfaces - set
them up to
> do point to point permanent G.711 and you get 3.5 Hkz / 8 bit
sampled sound
>
> this could still run out several £100 when you add voice grade
feature upgra
> des for the routers, voice interfaces and DSPs - but 2nd and more
channels
> will be cheaper.....
> >
> > I suppose I really need some form of single line mux.
> >
> >
> > --
> > Woody
> >
> > harrogate3 at ntlworld dot com
> --
> Regards
>
> stephen_hope@xyzworld.com - replace xyz with ntl
>
>

Just what I wanted - the circuit concerned uses Cisco routers!

I should have said at the start that I only need a single audio (i.e.
mono) pathe with a 300-3000Hz audio response, the flatter the batter.
Looks like the last option will fit the job perfectly.

Many thanks.


--
Woody

harrogate3 at ntlworld dot com

"Jono" <nothanks@blueyonder.invalid> wrote in message
news:mn.9d727d796ec516b1.48968@blueyonder.invalid. ..
> Mark formulated the question :
>> On Fri, 14 Sep 2007 16:41:51 GMT, "harrogate3"
>> <nospam3@ntlworld.com>
>> wrote:
>>
>>> I have an application where I need to be able to send audio from A
>>> to
>>> B about 40 miles apart. There is no audio circuit between the
>>> sites
>>> but there is a (fairly) high capacity data circuit.
>>>
>>> Does anyone know if there is a simple and inexpensive interface
>>> box on
>>> the lines of an ATA that can talk to another box of the same type
>>> over
>>> the data circuit usingVOIP-type operation? Ideally I could do with
>>> it
>>> being four-wire presentation - that is seperate 600R go and return
>>> audio at each end - but two-wire presentation will do at a push.
>>>
>>> Any help gratefully received.
>>
>> Slingbox?
>
> Interesting thought, though it's not duplex & requires a software
> client to be running.
>
>
>

A colleague put me onto exactly what I need.

http://www.toneremote.co.uk/trip.htm

I should have thought to ask - I used to work with the guy who owns
the company!

£675 apiece (two needed) but in the professional business this is not
expensive, especially when compared against the cost of a 80Km
landline!


--
Woody

harrogate3 at ntlworld dot com

On Fri, 14 Sep 2007 16:41:51 GMT, "harrogate3" <nospam3@ntlworld.com>
wrote:

>I have an application where I need to be able to send audio from A to
>B about 40 miles apart. There is no audio circuit between the sites
>but there is a (fairly) high capacity data circuit.
>
>Does anyone know if there is a simple and inexpensive interface box on
>the lines of an ATA that can talk to another box of the same type over
>the data circuit usingVOIP-type operation? Ideally I could do with it
>being four-wire presentation - that is seperate 600R go and return
>audio at each end - but two-wire presentation will do at a push.
>
>Any help gratefully received.

Have a look at www.barix.com They have various products which will
probably meet your needs.

I use their Instreamer and Exstreamer units to relay music/PA
announcements from one building of our conference centre to another

Paul