jwk@galbp.UUCP (John Kish) (11/09/85)
I am looking for information or pointers to information on telephone ring
control. What I want is as follows:
A device that can be plugged into a standard modular phone jack
that is capable of disabling the ringing of all telephones while
still getting a ring indication itself. However, it also needs
to have the ability to ring the other phones if the call is not
for itself.
This may or may not be possible, I don't really know.
Mail me any ideas or sources of ideas.
Thanks,
John Kish
Lanier/Harris
Computer R&D
..!{gatech,akgua}!galbp!jwkewa@sdcc3.UUCP (Eric Anderson) (11/15/85)
In article <233@galbp.UUCP> jwk@galbp.UUCP (John Kish) writes: > What I want is as follows: > > A device that can be plugged into a standard modular phone jack > that is capable of disabling the ringing of all telephones while > still getting a ring indication itself. However, it also needs > to have the ability to ring the other phones if the call is not > for itself. This could be done two ways: 1. Place the device between the phone company and all extensions, so that it can choose to pass the ring on or not. 2. Make the device sink so much current (like 10A) that other phones can't ring. The phone company may not appreciate this, though. Now for the question: How are you going to determine if the call is meant for you without answering the phone? If the device answers and elects to pass on the call, it will have to generate its own ringing voltage for the extensions, since the line will already be active. Meanwhile, whoever called will be confused unless you can echo the ring back to them. (do NOT send the ringing voltage (somewhere around 60VAC) back down the active line!!) Eric Anderson, UC San Diego {elsewhere}!ihnp4!ucbvax!sdcsvax!sdcc3!ewa Home: (619)453-7315 Work: (619)586-1201 White House: (202)456-1414