Blocking first telephone ring?

[John W]

I saw a thread from 1997 on this subject when doing a web search on this
subject but nobody ever had a solution. I figure now that this is 2005
perhaps some new technology is available. I'm using a computer to screen
calls. Caller ID is transmitted between the first & second ring. While I am
able to successfully block calls, I still get the first ring. I'm looking
for a device that I can connect to my phone line before the telephone that
will not cause the phone to ring on the first ring but start on the second.
Does such an item exist & if so where can I find it? If it doesn't a person
could get rich developing such a device. It seems like it would be quite
simple!

Thanks,

John

[Mark Thomas]

Hmm, I've seen several things like this. Here's one a google search
brought up. Looks like it'd do the trick:
http://www.privacycorps.com/products/?id=20

[Byron A Jeff]

In article <2iwId.2995$dm5.1081@fe37.usenetserver.com>,
John W <jward2NOSPAM@fuse.net> wrote:
-I saw a thread from 1997 on this subject when doing a web search on this
-subject but nobody ever had a solution. I figure now that this is 2005
-perhaps some new technology is available. I'm using a computer to screen
-calls. Caller ID is transmitted between the first & second ring. While I am
-able to successfully block calls, I still get the first ring. I'm looking
-for a device that I can connect to my phone line before the telephone that
-will not cause the phone to ring on the first ring but start on the second.
-Does such an item exist & if so where can I find it? If it doesn't a person
-could get rich developing such a device. It seems like it would be quite
-simple!

There's no easy solution for a couple reasons:

1) Many telephones use the first ring to initiate the search for CID.

2) Blocking the ring generally blocks the CIS transmitted signal.


Blocking the ringing is pretty simple. All you have to do is run the tip
and ring of the line into a full wave recitifier. By converting the AC
ring signal into DC, the ringing is suppressed. But so is the CID.

I actually have a similar project on my task list: suppress the distictive
ring while allowing the normal one to go through. Also you can use this to
route the distictive ring to a fax and whatnot.

But I need CID when the call comes through.

As a first pass I plan to use a CID phone with the ringer cut off and a
second phone for the ringer only. Then use a relay to switch between the
full wave bridge and the straight line. My PIC based circuit will detect
the ring type and if it's one where the phone is supposed to ring, then
switch out the bridge, causing the ringer only phone to ring. The CID will
always be passed to the CID no-ringer phone.

The right way to do it is for the circuit to capture the CID, then replay
both the 1st ring and the CID to the target, then connect the line through.
But that's a daunting task.

BAJ

[Andrew Gabriel]

In article <2iwId.2995$dm5.1081@fe37.usenetserver.com>,
"John W" <jward2NOSPAM@fuse.net> writes:
> I saw a thread from 1997 on this subject when doing a web search on this
> subject but nobody ever had a solution. I figure now that this is 2005
> perhaps some new technology is available. I'm using a computer to screen
> calls. Caller ID is transmitted between the first & second ring. While I am
> able to successfully block calls, I still get the first ring. I'm looking

Rather drastic perhaps, but you could move to the UK where the
callerid is sent before the first ring ;-)
The reason you cite is exactly why this is done. It also allows
for no-ring calls where some piece of equipment grabs the call
based on the callerid before the phones ring. Recieving SMS
messages over landlines is an example of such calls.

--
Andrew Gabriel
Consultant Software Engineer

[nobody@is.home]

www.homeseer.com and the Way2Call USB device. Same thing I do.
Homeseer gets the call and then it decides if the phones in the house
will ring or not based on CID. Ultimate for complete control over you
phone.


On Sat, 22 Jan 2005 12:44:32 -0500, "John W" <jward2NOSPAM@fuse.net>
wrote:

>I saw a thread from 1997 on this subject when doing a web search on this
>subject but nobody ever had a solution. I figure now that this is 2005
>perhaps some new technology is available. I'm using a computer to screen
>calls. Caller ID is transmitted between the first & second ring. While Iam
>able to successfully block calls, I still get the first ring. I'm looking
>for a device that I can connect to my phone line before the telephone that
>will not cause the phone to ring on the first ring but start on the second.
>Does such an item exist & if so where can I find it? If it doesn't a person
>could get rich developing such a device. It seems like it would be quite
>simple!
>
>Thanks,
>
>John
>
>