On Dec 1, 2003, at 10:10 AM, Jon Pounder wrote:
That's an interesting solution.
Caveats :
- To have a door phone and door release would require 2 ports on the pbx
unless you don't want to be able to call the doorphone, or release the
door while the caller is still on the line.
Yes, I am using 2 ports for this. Otherwise, the door would open if you just wanted to ring the phone outside the door. I have 2 extensions, (1) front door, and (2) front door release.
I have my PBX set up so that if you dial the release extension, it rings once or twice, and then hangs up the call. This way, people can program their phone for the release, and just press a button on their phone to open the door. (for example, if someone just rings the doorbell or knocks, instead of calling).
As it happens, the contactor also closes a nice 12V (or something like that, circuit), and I added another cheap piezo buzzer, because the system I had didn't have any buzzer sounds..).
- if the doorphone is a regular phone and uses this method, anyone could
simply apply 120VAC to the phone jack for it and presto, the door opens.
If you used just one extension for both, and the phone jack was accessible, and the person had a source of 120V nearby. (or brought 10 9v batteries with them for 90V).
But, there's probably easier ways to defeat electric door releases than all that.
For a door release, I have a cheap radio-shack device which is supposed
to light up a lamp when a phone rings. Basically, it has a contact
which is activated by the ring signal on a telephone line.
I wired this up to the door release in the office, and have it hooked up to our (non asterisk) PBX. So, anyone can open the door by dialing the extension. The ringing itself opens it.
The radio shack doojigger was probably about 10 bucks.
-SteveK
On Nov 26, 2003, at 6:12 PM, Jon Pounder wrote:
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.
I just use an ordinary "disposable" phone, and put the zap channel in
immediate mode. lift the phone and it starts to ring the extensions in
the
context it jumps to. I can also call the doorphone just like any other
extension and it rings when I do so. Basically the keypad is ignored on
the phone.
as for door release, I have an electric strike on my dsc alarm system,
but
I have just not gotten around to making an agi that I can use to flip a
bit on the parallel port and have that release the strike as well.
(2n2222, a 10k resistor, and a pcb mount 12v relay, and a flyback diode, hooked up to the data bit, and in parallel with the alarm release relay.)
We intend to deploy Asterisk in a 72 extensions + 16 trunks in a while, so any info will be great.
thanks
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