Raspberypi

Do you think it's possible to use a http://www.raspberrypi.org/ to make some
sort of VOIP device ?

I'm always amazed how much voip ata devices cost for example.

Stephen

In article <-YydnQ3MVLFQUyvTnZ2dnUVZ7sudnZ2d@brightview.co.uk>,
Stephen Hammond <someone@imco.com> wrote:
>Do you think it's possible to use a http://www.raspberrypi.org/ to make some
>sort of VOIP device ?

If you can get audio in & out, then there's no reason why not.

It'll be a bit of a hobby project though, looking like a pile of
spaghetti on a bench...

Unless you put it in a box with Ethernet and audio sockets and a nice
little display and dial-pad, but by then you've just re-invented the
SIP phone and you can buy those for 40 quid or so...

>I'm always amazed how much voip ata devices cost for example.

50 quid? (or less) I think that's a pretty good price for what you're
getting. Processor, RAM, Flash, etc. analogue interface, digital interface
(Ethernet), TCP/IP software stack, and other softwares to plumb it
all together...

Gordon

Stephen Hammond <someone@imco.com> wrote:
> Do you think it's possible to use a http://www.raspberrypi.org/ to make some
> sort of VOIP device ?
>
> I'm always amazed how much voip ata devices cost for example.

Yes, but there's only one ethernet port. There's no FXO or FXS or any means
of adding one (though I suppose one of those 'use Skype on your landline
phone' USB gadgets might work).

The GPU is pretty good... if someone was able to write (eg) audio
transcoding code for it I'd guess Asterisk performance would be good (I have
no firm data for this).

Question is, what would you do with a small VOIP device with only interfaces
to the ethernet or USB worlds? If you can think of a use, it'll probably be
able to do it.

Theo

In article <N+f*JFCRt@news.chiark.greenend.org.uk>,
Theo Markettos <theom+news@chiark.greenend.org.uk> wrote:
>Stephen Hammond <someone@imco.com> wrote:
>> Do you think it's possible to use a http://www.raspberrypi.org/ to make some
>> sort of VOIP device ?
>>
>> I'm always amazed how much voip ata devices cost for example.
>
>Yes, but there's only one ethernet port. There's no FXO or FXS or any means
>of adding one (though I suppose one of those 'use Skype on your landline
>phone' USB gadgets might work).
>
>The GPU is pretty good... if someone was able to write (eg) audio
>transcoding code for it I'd guess Asterisk performance would be good (I have
>no firm data for this).

Asterisk performace was adequate on the Nokia N770 - A 252MHz ARM. You
don't need to transcode to run asterisk, but some people still want to
have crappy GSM call quality for some bizarre reason... Or you might
be using G729. I know that an AMD Geode (P5 architechure) running at
500MHz can transcode 4 or 5 ALAWs into G729, so the faster ARM in the
RPI ought to cope better even before using the GPU...

But as you say - what's the point?

Gordon