Well, it can tell after it%26#39;s picked up the phone. The sending fax sends a fax announce tone, 1100 Hz, for half a second repeated every three seconds.
But there is no way of knowing a fax is calling until you pick up the phone. Unless you (or your machine) recognize the caller ID. So if you know a fax is going to come from a particular number, you can programme your machine to answer.
This is the reason home fax mahines are often tied in with answering machines. The machine picks up the phone and if it hears the fax announce tone, switches to fax, otherwise it%26#39;s through to the answering machine. Yes, many of those all in one fax/copier/scanner devices do just that. They are made for a home office.
You control how many rings you want it to answer.
Pretty easy stuff YES... most fax machines have the ability to do this...
some older fax machines may not be able to do this... but there is a soloution for that problem also. they sell a fax switch. you connect the fax switch at or near your demarc. you connect the wire going to the fax jack into the fax port of the switch, and the wire connecting the rest of the jacks to the phone port of the jack... and the dial tone from the nid connects to the input of the device... it will send your incomming faxes to the fax jack, and the voice calls will ring to your phones...
here is a link to what i am talking about
http://www.cwol.com/fd2.htm
i purchaced and installed something similar in a doctors office some time ago at staples..however i believe that staples no longer carries these, as most modern fax machines are able to distinguish the diffrence between voice and fax calls.
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