Re: [Asterisk-Users] Intercom system (not paging system)

[David Schumann]

Thanks for all the ideas!

I looked around on the internet last night to try and find some ideas for the wiring and came across some sites that have started me thinking about how the phone might be wired to get the intercom to work. I thought I would pass what I found on to everyone in case they found some of the wiring ideas useful.

Wiring diagram that shows an inexpensive way to automatically answer a phone line using a Bilateral trigger diode to open a circuit:
http://www.phrack.org/show.php?p=35&a=9

General telephone circuit diagrams:
http://www.electronic-circuits-diagrams.com/telephones_circuits.shtml

Phone wiring guide:
http://massis.lcs.mit.edu/telecom-archives/archives/technical/wiring.inside.phones

Wide variety of links to telephone wiring, circuit diagrams, and do it yourself ideas:
http://www.electronics-ee.com/Electronics/Circuits/Telephone.htm

Hope this helps others!

---

David Schumann <[EMAIL PROTECTED]>
Filter Products Company
P.O. Box 13068
Richmond, VA 23225
804-231-4646, phone
804-233-3912, fax
http://fpcfilters.com

> Great idea, James.
>
> David, you could use the manager interface to automagically do all this. When one person initiates a call to the speaker phone, the manager interface could automatically send the speaker extension to the conference room. Voila, you're both hooked up!
>
> Check out mattf's thread, "Asterisk Manager Interface notes " on last month's user archives and John Todd's reply to the thread "Office-wide paging with Asterisk and Cisco 7960 7940 phones" (same month) for an idea of how to get it to work.
>
> If you're patient, I'm working on something similar for my Polycom phones now, but it'll probably take me a day or so to write it. I'll post it if it works.
>
> John
>
> ----- Original Message -----
> From: James H. Thompson
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Sent: Monday, February 09, 2004 6:52 PM
> Subject: Re: [Asterisk-Users] Intercom system (not paging system)
>
>
> This may be a way to do what you described with a $20 speaker phone and no phone modifications:
> Using the speaker phone dial-in to a conference room on the asterisk Then whenever anyone wants to call this extension, you can route their call to the conf room and they can have a two-way conversation.
>
> Possible Downsides:
> * if call from the conference room gets terminated for any reason, then it will have to be re-established manually.
> * resources consumed to keep conference room open and call always active
>
> Possible Advantages:
> * phone only in auto-answer when you put it in that mode
> * phone usable to make and receive normal calls
>
>
> Jim
>
> James H. Thompson
> [EMAIL PROTECTED]
>
> ----- Original Message -----
> From: James H. Thompson
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Sent: Monday, February 09, 2004 1:55 PM
> Subject: Re: [Asterisk-Users] Intercom system (not paging system)
>
>
> There is an auto-answer speakerphone that might do what you described:
>
>
> http://www.vikingelectronics.com/products/apartmententry/k-1700-3(rd).html
>
>
> Jim
>
> James H. Thompson
> [EMAIL PROTECTED]
>
> ----- Original Message -----
> From: David Schumann
> To: [EMAIL PROTECTED]
> Sent: Monday, February 09, 2004 9:57 AM
> Subject: [Asterisk-Users] Intercom system (not paging system)
>
>
> I've looked around and found previous discussion about this, but so far I have not seen any answers that really solve this problem.
>
> I'd like to integrate an intercom system into Asterisk so that users could dial an extension, the phone on the other end would emit a beep, and then the speakerphone would activate letting two people have a conversation without the person at the extension picking up the phone. This is a huge benefit for an office/warehouse environment.
>
> I know that this can be programmed with certain Cisco phones (set to autoanswer), but my problem is that the phones that I want to do this with are down in our warehouse and I think the Cisco phones would be stolen quickly. I've also thought about a writing a software solution with microphone and a set of speakers, but, again, the computers would probably end up getting stolen.
>
> A $20 analog speaker phone would work great if I could wire the speaker phone to pick up the line automatically on ring and then hang up the line on disconnect. Anyone know how to change the wiring to get it to work?
>
>
>
> David Schumann <[EMAIL PROTECTED]>
> Filter Products Company
> P.O. Box 13068
> Richmond, VA 23225
> 804-231-4646, phone
> 804-233-3912, fax
> http://fpcfilters.com
>
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