I would like to develop a circuit to disconnect a dial-up connection when I receive the signal of a call in waiting. Could someone speak me where I could get the specifications of public telephony [in US if there is not a world-wide standard]?
Could you and Homer give me a answer to my question instead critiques? I am new to groups sci.eletronics.* I didn't know the existence of others good newsgroup. FORGIVE ME, PLEASE. (hehehe)
Learning the netiquette is important because we don't want to answer the same question 7 times.
As for your project, you need to
1) Detect the call waiting signal
2) Put your modem 'on hold' so it still thinks it is connected
3) Connect your phone to the line
4) Send the correct signal to transfer the incoming call over
Then when you are done you need to reverse the connections.
Thanks you, JF. I don't know why but that always happen with me in US/ english chats. The answers always seem to have haine.
"Why bother with all of that redialling if you don't have to? "
Because I don't need to worry in redialling because I don't pay by the number of diallings. I has installed a service with fixed cost in diallings for my internet service provider and also because I believe that the calling would hang up.
Ignore Fields. He's an arrogant pompous ass. No one else pays him any attention.
As long as it isn't a problem, sure. But even in the US which doesn't normally have a per call cost, it's nice to be able to hang up the phone and continue surfing without delay.
They've posted a couple of links - I don't know if they've answered your question, but it's a place to start.
Oh, just ignore the trolls. There's nothing to forgive, but it's still a good idea to read up on netiquette.
In any case, it sounds like all you need is a "call waiting signal" detector, and a switch.
As far as picking up the "call waiting signal", all I really know to recommend is to google for it, or somebody might already have a circuit. A switch, I'd say, get a "make-before-break" so that when you switch over you don't interrupt the "off-hook" current.
About newsgroups, there are lots of them - you should call your ISP, and find their news server's IP, and learn how to use a newsreader.
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