How does this work? If I have a single phone line, say 0207223333 and on the line I have a BT splitter with an analogue phone and a fax connected. If I was then to dial that number, how would it distinguish to dial the phone or fax? Or is this not possible, what would happen?
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4This question appears to be off-topic because it is not about computers– Ƭᴇcʜιᴇ007Jul 5, 2013 at 0:33
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2 Answers
IIRC, the originating FAX is supposed to emit it's carrier tone as soon as the connection is made (whereas an originating data modem waits for the answering side to emit a carrier tone first).
So an answering device can listen very briefly to the line and determine if it's FAX or voice.
answered Jul 5, 2013 at 0:29
as i understand it (which may well be badly!), in the same way that a call can continue to an answerphone, if the incoming call goes unanswered it can begin to initiate a fax.
I think that's why you can buy combined fax/phones which ring the phone section as a call comes in before the fax itself begins.
The bit i'm unsure of is if that were true then why on a sending side do they have to hit a button to start the fax. Perhaps that's picked up by the other end listening out for it.
