Bs2 pbx

zebawitz

Do you think it would be possible to make a small PBX using the basic stamp 2 series? What about a pbx with intergrated VM using a voice recording dev kit?

Paul Baker

Is it possible: probably, is it easy: absolutely not. It is somewhat complicated to connect a BS2 to a phone line, let alone multiple lines. Added to the difficulty is hosting services would have to be implemented such as intra-line to intra-line phone calls (detecting DTMF signals, sending a ring signal etc) that is not dealt with existing phone line interfaces since they are end units. Also extensive additional hardware would be nessesary because the BS2 is only fast enough to act as a commander module, not able to directly deal with the voice data itself. Finally if you have the intention of interfacing to trunk lines, you'll need to get FCC/UL certification (costly) because the telephone companies don't take very kindly to devices connected to thier network that don't conform to specifications and cause problems requiring thier intervention (they've been know to levy huge fines for just drawing current from thier lines above a very low amount).

Unless you are looking to develop your own commercial PBX, I would just sign up for a virtual PBX marketed for SOHOs, less money and aggrevation.

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zebawitz

Good points.. Not so interested in the commercial aspects, more or less in the challange [noparse]:)[/noparse]· It would have to be an analog system maybe no more than·1 line / two stations? Thinking based on what you mentioned about speed, the intergrated VM is out of the question, but it should have enough to control a few relays and listen to/create tones. I actually was inspired by this webpage http://wandel.ca/homepage/pbx.html. Nothing fancy, just 'git r done'

Let me know what you think.

Paul Baker

Quite interesting, it does look like a system like that counld be controlled by a BS2, the key is finding a DTMF receiver chip, they are becoming quite rare nowadays. The voice recording could work if you had the hardware to do it, the BS2 couldn't do it itself, but it could direct an external module to do it. If you break the project down into manageble parts, it would still be a challenge but should be acheivable with enough perserverence.

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CounterRotatingProps

Don't waste your time, just use Asterisk. It's free, open source, fairly easy to set up, highly extensible, programmable ... and we have made it make coffee too. You need a box pc of only modest power and a phone card if you're connecting to the 'normal' phone system. We have several machines scattered across the globe - and we 'internet phone' between the machines totally transparently.

http://www.asterisk.org/

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Carl Hayes

spikeinin said...
If you're looking on developing your own commercial PBX, it would just signing up for a virtual PBX marketed for SOHOs..


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Can't make head or tail of that statement!

Post Edited By Moderator (Chris Savage (Parallax)) : 8/20/2009 4:50:11 PM GMT

BradC

Carl Hayes said...

spikeinin said...

If you're looking on developing your own commercial PBX, it would just signing up for a virtual PBX marketed for SOHOs..


____________________

Can't make head or tail of that statement!

You're not supposed to. It's simply a spam to boost the pagerank of the link in the signature. Probably not even posted by a human.

Post Edited By Moderator (Chris Savage (Parallax)) : 8/20/2009 4:50:21 PM GMT

Chris Savage

Hello,

The SPAM has been removed and any messages quoting it have been edited to remove the SPAM link.

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Chris Savage
Parallax Engineering