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- Path: news.cc.uic.edu!usenet
- From: yaojun@tigger.uic.edu (John)
- Newsgroups: comp.dcom.modems
- Subject: Re: Voice/Fax Modem vs Fax w/Voice
- Date: Mon, 11 Mar 1996 00:34:03 GMT
- Organization: University of Illinois at Chicago
- Message-ID: <4hvov4$s4c@piglet.cc.uic.edu>
- References: <4hl7jf$h9p@news.sas.ab.ca>
- NNTP-Posting-Host: slip5b-02.dialin.uic.edu
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-
- Redirecting a fax and voice call is a little complicated issue. The
- main reason for that is the way poeple sending faxes and the way a fax
- machine sending fax. In general, there are two way to send a fax:
-
- 1. manual dialing in which poeple pick up the hand set or push the
- Speaker Phone/On Hook Dial button and then dial. Faxes sent this way
- nerver send a calling tone (CGN), a slow repeating beep, wich is a key
- signal that recieving fax machine/modem is waiting to switch to fax
- mode. So manual dialing usually invokes the voice part from the
- recieving side. Some fax machine added a silent detect feature which
- will detect the length the silent after it pick up the call. If
- nobody speaks for about 3 seconds it will switch to fax mode and send
- out recieving tone( a high frequency squeese).
-
- 2. Automatic dialing in which people dialing by push a button with a
- number prestored or a timed fax, or redial the fax machine is always
- send a CGN, which always invoke the fax part of the recieving side
- and cause the recieving part to send a recieving tone.
-
- So if a fax is sent by automatic dialing any recieving device with
- automatic switch function can redirect the fax to fax. But if the
- fax is sent by manual dialing the recieving device depending the mode
- you set will either treat the incoming call as fax(if you set it as
- fax mode) or treat it as voice call(if you set it at manual or
- automatic mode).
-
- Since different manufacturers have different design for above issue it
- is very difficult to efficiently to redirect fax and voice call in one
- phone line. A better solution is order a distinctive ringing service
- from your phone company which give you another number for the same
- line. The added number has a new patten of ringing. If you assign this
- ring patten to fax/modem and when a ring of new patten rings you will
- know it is a fax or a modem call and need not to pick up. The best
- solution which is what I currently use is to add a ring reader( a
- small device connected in between your phone/modem/fax and wall
- outlet. The ring reader will recoganize the ring pattern and redirect
- fax call to fax and voice to voice!
-
- Hope this helps!
-
- -John
-
-
- smithr@freenet.edmonton.ab.ca () wrote:
-
- >After three voice/fax/data modems, I am discouraged with the technology's
- >inability to reliably differentiate between voice and fax calls. Now, I
- >am on the verge of buying a Fax machine that has digital voice mail.
-
- >Does anyone know if the technology is any different in a fax machine with
- >voice mail than what is in a voice/fax/data modem. In short, will I have
- >the same problems differentiating between voice and fax calls.
-
- >Also, there are devices that hook up to the phone lines that simply split
- >up a call and route them to TAD's, faxes and modems. Is this the same
- >technology too? Is it any more reliable than the aforementioned devices?
-
-
- >TIA
-
- >Rand
- >--
- >Rand Smith
- >smithr@freenet.edmonton.ab.ca
- >76535.217@Compuserve.com
-
-
-