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

[John Todd]

See below for a previous post of mine.  It doesn't offer a "dial pad" 
like most normal phones, but won't get stolen, offers the intercom 
service you want, and has a big fat button for people to call a 
"hotline".

JT

>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 <<mailto:dschumann at fpcfilters.com>dschumann at fpcfilters.com>
>Filter Products Company
>P.O. Box 13068
>Richmond, VA 23225
>804-231-4646, phone
>804-233-3912, fax
><http://fpcfilters.com>http://fpcfilters.com



>Date: Wed, 26 Nov 2003 22:43:27 -0500
>To: asterisk-users at lists.digium.com
>From: John Todd <jtodd at loligo.com>
>Subject: Re: [Asterisk-Users] door phone
>
>>Hi,
>>
>>Anyone know anything about Asterisk's support for door phones? 
>>Receiving the call from the door intercom system, opening the door, 
>>etc?
>>
>>Any hardware recommendations? I understand that the equipment we 
>>have now is Panasonic proprietary and came with the currently 
>>deployed Panasonic TD12-32 pbx.
>>
>>We intend to deploy Asterisk in a 72 extensions + 16 trunks in a 
>>while, so any info will be great.
>>
>>thanks
>
>While this isn't an Asterisk question, I guess, I find it hard not 
>to comment on a particularly excellent piece of equipment which 
>which I've worked previously:
>
>http://www.talkaphone.com/products.cfm?prodid=168
>
>Can be ordered from Grainger (at least, two years ago it could) here 
>in North America under part number 4RR12 "Emergency Access Phone" 
>for $623.50.  I'm sure you can find it elsewhere, too.
>
>Built like tanks, designed for outdoor implementation.  I _highly_ 
>recommend this device.  ADA-compliant with braille and raised 
>letters (must be mounted within wheelchair height to be compliant.) 
>They can dial a specific sequence of numbers upon button press, and 
>they can take inbound calls, or even auto-dial when someone is 
>screaming at it with the right module option.  Also includes a set 
>of relays that can be activated via DTMF.  All analog, will plug 
>right into an FXS port.  I'm sure a clever hacker could find some 
>NEMA-rated outdoor boxes into which an ATA-186, WiFi device, power 
>regulator, and battery could be built, and a solar panel mounted on 
>the top for a campus-wide or for large park areas with no wiring...
>
>To address the other point made on this thread: the DTMF sequences 
>to open the door are only valid coming from the "far end" of the 
>call.
>
>JT