Doorbel via telephone

Depends on the PABX system you are using.

Will the PABX allow all six lines to ring at the same time ??

Please check you user manul.

donald

PS: I would say use a PIC, but in your case I just say, "use a Z8". :-)

I have a Panasonic 2-line phone (KX-TS3282B) which supports up to

8-extensions, with paging/intercom capability. Whether they make a "door-bell" equivalent I don't know.

...Jim Thompson

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|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
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|  Phoenix, Arizona            Voice:(480)460-2350  |             |
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The pabx will send the ring tone to the first connection, then the second, third and so on... If nobody answers then it start the cycle all over again and again... But that's not the real problem (it's no problem at all)

My problem is to use a set-up like a parlaphone (doorbel phone) and to wire it in such a way that it can act as a telephone.

When the doorbel is pressed it has to send a sequence of tones that form a number recognized by the pabx as a call to all connected telephones. It then wait's for an aswer. If not the phones keep on ringing for let's say 10 times. Then the connection is ended.

If there is a connected telephone that answers the call the parlaphone will act as a two way communication device. Just as a normal telephone. The two parties can talk to each other.

Of course an old telephone can be used but we have to find a way to form a sequence of numbers to dial the moment the doorbel is activated. A timer will check the time from activation to disactivation in the event there is no reply on the other side of the pabx.

When the phone is hooked on again the connection is obvious ended.

Well that's probably a better description of what it should do.

Thanks for the answers. Zilog

:Hi, :As I've been asked (family) to construct a doorbel - PABX interface I :have to resort to the ingenuity of fellow readers. :What is the aim? :When the doorbel is pushed, all telephones connected to the in-house :pabx (1 external line, 6 internal lines, 2 wire) have to ring. :Any of them can accept the call and talk to the kind of "parlefoon" on :the door. :This "parlefoon" is connected as telephone nr6 of th PABX. :A two way communication is then setup. :There is a method to let all connected telephones to ring when a :particular sequence of digits is sent to the PABX. :1. How to generate this sequence of tones. :2. How to establish a conversation. : :Thanks :Zilog

I believe you are wasting your time if you try to do this. For a start nobody can advise you unless they intimately know the existing PBX system currently installed in your premises. Even then, it is highly unlikely they would know all the intricacies of that particular PBX, facilities, programming modes, circuitry, hardware add-ons etc, etc. And they would be even less likely to know how to advise you to hack into the system to incorporate your add-on circuitry.

You would be far better off, and it would be cheaper in the long run, to buy an off-the-shelf system such as the Panasonic KX-TA824

or even the older obsolete KX-TA308 which may be available 2nd hand or on Ebay, which provide most if not all of your requirements. These systems have a door telephone and call forwarding. If the door phone is activated it will ring a selected phone but if this isn't answered in a preset number of rings, it forwards the call to another phone, and so on. While these systems also include all-phones paging with call pick-up, this function is not activated from the door phone. If it were possible then your problem would be solved. It may be possible to build an add-on circuit for these systems to intercept the door phone call and then activate the paging/call pickup function, which would be far simpler than what you propose.

all

know

far

Thanks for the reply. But I have to ask you to read all the postings before answering. As you could have seen all that's needed is an interface between the doorbel (eg parts of an old telephone?) and the pabx. One internal line is used for this doorbel (telephone). After pushing the doorbel (= same as taking the phone Off-Hook) the interface must generate a sequence of known numbers (eg 6 0 0 - six zero zero) and when this sequence of numbers is send to the pabx ALL telephones ring one after the other. A feature excisting in the pabx! If any of them will answer a conncetion is created. AFter the answering phone is placed On-Hook, the connection is interupted. Only other problem remains,; if after a fixed number of rings (eg 10) the ringing will stop.

So there are two main items:

1. Generate a known sequence of numbers (DTMF code)
2. A Ringing counter that resets the doorbel interface.

Voila. This must clarify the problem a b it more. There is no option of buying another pabx. I'm looking for an interface to be build. Tips and links to schematics are very usefull. No new PABX.

Thanks, Zilog

I appreciate your detailed explanation and I do understand your requirement.

If you could tell us the brand and model of your existing pabx we may be able to help further. Most small pabx's already have a doorphone facility (usually via an add-on card) but depending upon the model may only contact a dedicated station. Some pabx doorphones actually use dtmf dialling to contact the main station.

On Thu, 07 Feb 2008 12:40:55 +0100, VMI wrote:

:Ross Herbert wrote: :> On Mon, 04 Feb 2008 16:39:54 +0100, VMI wrote: :> :> :Hi, :> :As I've been asked (family) to construct a doorbel - PABX interface I :> :have to resort to the ingenuity of fellow readers. :> :What is the aim? :> :When the doorbel is pushed, all telephones connected to the in-house :> :pabx (1 external line, 6 internal lines, 2 wire) have to ring. :> :Any of them can accept the call and talk to the kind of "parlefoon" on :> :the door. :> :This "parlefoon" is connected as telephone nr6 of th PABX. :> :A two way communication is then setup. :> :There is a method to let all connected telephones to ring when a :> :particular sequence of digits is sent to the PABX. :> :1. How to generate this sequence of tones. :> :2. How to establish a conversation. :> : :> :Thanks :> :Zilog :> :> :> I believe you are wasting your time if you try to do this. For a start nobody :> can advise you unless they intimately know the existing PBX system currently :> installed in your premises. Even then, it is highly unlikely they would know all :> the intricacies of that particular PBX, facilities, programming modes, :> circuitry, hardware add-ons etc, etc. And they would be even less likely to know :> how to advise you to hack into the system to incorporate your add-on circuitry. :> :> You would be far better off, and it would be cheaper in the long run, to buy an :> off-the-shelf system such as the Panasonic KX-TA824 :>

:> or even the older obsolete KX-TA308 which may be available 2nd hand or on Ebay, :> which provide most if not all of your requirements. These systems have a door :> telephone and call forwarding. If the door phone is activated it will ring a :> selected phone but if this isn't answered in a preset number of rings, it :> forwards the call to another phone, and so on. While these systems also include :> all-phones paging with call pick-up, this function is not activated from the :> door phone. If it were possible then your problem would be solved. It may be :> possible to build an add-on circuit for these systems to intercept the door :> phone call and then activate the paging/call pickup function, which would be far :> simpler than what you propose. :Thanks for the reply. :But I have to ask you to read all the postings before answering. :As you could have seen all that's needed is an interface between the :doorbel (eg parts of an old telephone?) and the pabx. :One internal line is used for this doorbel (telephone). :After pushing the doorbel (= same as taking the phone Off-Hook) the :interface must generate a sequence of known numbers (eg 6 0 0 - six zero :zero) and when this sequence of numbers is send to the pabx ALL :telephones ring one after the other. A feature excisting in the pabx! :If any of them will answer a conncetion is created. :AFter the answering phone is placed On-Hook, the connection is interupted. :Only other problem remains,; if after a fixed number of rings (eg 10) :the ringing will stop. : :So there are two main items: :1. Generate a known sequence of numbers (DTMF code) :2. A Ringing counter that resets the doorbel interface. : :Voila. :This must clarify the problem a b it more. :There is no option of buying another pabx. I'm looking for an interface :to be build. :Tips and links to schematics are very usefull. :No new PABX. : :Thanks, :Zilog

all

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calims 10683 FREE Manuals and I have found full documentation that I needed on several phone systems. A used Nitsuko (NEC) system was donated to my church. From the looks of the documentation, even 'Sloman' could install it.

That system has a board availible to do what the OP wants, and a lot of other systems offered it as an option.

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