telephone hacking

[Henry Gomersall]

Does anyone have any experience hacking on devices to plug into the
telephone system?

Essentially I want to build a bit of voip hardware that talks to both
sides (PXO and PXS) of a telephone system that I'm in proper control of
and isn't crap (and doesn't involve a PC with various PCI cards).

What I want:

-------- ------- -----------
|outside | | My | | House |
| PSTN | <---> |widget | <----> | telephone |
| | | | | system |
-------- ------- -----------
/|\
|
\|/
---'----
| Router |
--------

There are loads of chips that seem hard to get hold of for small scale
stuff and its also not clear to me what the differences are between
either side, ie, how is the interface different for the house side
compared to the PSTN side.

Any help appreciated!

cheers,

Henry

[Robert Jason Meerman]

What is the problem exactly? Separating signals?

Have you considered using an ADSL micro filter too separate the analogue frequencies from the digital? I appreciate that adsl isn't what you're playing with...

(I think limber misunderstood your problem, sorry)

RobM

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[Henry Gomersall]

On Wed, 2010-06-30 at 13:58 +0100, Robert Jason Meerman wrote:
> What is the problem exactly? Separating signals?
>
> Have you considered using an ADSL micro filter too separate the
> analogue frequencies from the digital? I appreciate that adsl isn't
> what you're playing with...
>

I want to create my own VoIP gateway. There are loads on the market, but
they are invariably very expensive or locked down (or very crap).

I just came across this project, that may well provide what I need...

http://www.rowetel.com/ucasterisk/

cheers,

hen