Hang up received Calls

If all you are going to do is record the Caller ID you don't neet to answer the call. The Caller ID is sent out between the 1st and 2nd ring.

... in the US at least. I have no idea how they do it in Saudi.

I wonder, in the US, if they send the ID via DTMF or if they use a different technique?

Bill

Many thanks. Exactly, but I want to hangup once I have the Caller ID, because I will receive a lot of calls in short period & I don't want to keep the line busy more than 3 seconds

Best wishes.

I don't think we could do that due to the over voltage protection on the phone lines, but once one has the phone number, he could call it back with the message "We cannot come to the phone at this time. Please leave a message and we will get back to you at the earliest opportunity." and repeat this say 2048 times... all done by machine... This would be sent with caller ID disabled. Of course it might result in ending up in jail for a period of time.

Back at the original question... IF DTMF signalling is used, I would use a circuit to detect the first ring... with a DTMF decoder to get the data... a microcontroller to massage the data and send it out to the computer via USB.

Getting the data from USB to disk or entered into a spreadsheet is a big software can of worms, and I don't have the can opener.

Bill

Many thnaks for ur answer,But my issue, I will receive a lot of calls (around 650 calls) within only 1:30 hour (from 12:00pm to 1:30 pm). I just want to get the caller ID. So I need the call time as short as possible, I will not answer the call (because already I got the Caller ID), & I need the call (ring) time be less than 1-3 seconds. Otherwise the most of the caller will find the line busy.

Many thanks again

Problem I see is that the person originating the call is the one who controls the line. If he lets it ring for 10 rings before hanging up, there is nothing that can be done with a single line.

Back in the olden days, we might have maybe 5 lines (or more) which were on a "rotary". If a call came in on line 1 and it were busy, the rotary would jump to line 2. If this were busy, jump to line 3. If this were busy, jump to... etc.

This is stuff we were doing 30 years ago. I know nothing about the Saudi phone system, and little about state of the art telephone technology, so take what I say with a grain of salt.

Bill

thanks