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- From: jwb@capek.rdt.monash.edu.au (Jim Breen)
- Subject: Re: Call Waiting --- A better way of informing the user ?
- Message-ID: <jwb.721951555@capek.rdt.monash.edu.au>
- Keywords: flash, recall
- Sender: news@monu6.cc.monash.edu.au (Usenet system)
- Organization: Monash University, Melb., Australia.
- References: <11048@uqcspe.cs.uq.oz.au>
- Distribution: aus
- Date: Mon, 16 Nov 1992 22:05:55 GMT
- Lines: 36
-
- anthony@cs.uq.oz.au (Anthony Lee) writes:
-
- >One thing that I found difficult to use about Call Waiting is
- >the way that a user is informed of another call. Currently,
- >this is done by the exchange sending a special tone but the
- >problem is the user might miss the tone especially if it is too
- >soft. I am wondering, what if the phones are themselves modified
- >with flash detector circuit. I propose a detector that looks for
- >three consecutive circuit breaks (flash or recall), these breaks
- >are of very short interval, should be even shorter then
- >what the recall button generates. By waiting for three breaks from
- >the exchange, the detector won't confuse that with the user pressing
- >the recall button. Having detected the three breaks, an LED would light
- >up to indicate CW. I think having a detector to detect the tone
- >would make the phones far too expensive and hence my alternative
- >proposal.
-
- >Any comments ?
-
- The problem with this proposal is that it probably would require
- mods to exchange hardware. I don't recall the facility in the codec
- card on AXEs (for example) to allow them to generate (as opposed to detect)
- circuit breaks. The big advantage of the present methos of signalling a
- call-waiting is that it all done by software, i.e. mucking around
- with the bit stream.
-
- If Telecom or CCITT could standardize on the frequency and duration of
- the call-waiting tone, or better still opt to
- use one of the spare DTMF codes, e.g. the A-D codes, phones could
- be easily made to detect that, and ring bells flash light, whatever.
-
- --
- Jim Breen JIS:$B%8%`!!%V%j!<%s(J
- Department of Robotics & Digital Technology. Monash University.
- PO Box 197 Caulfield East VIC 3145 Australia (ph) +61 3 573 2552
- (fax) +61 3 573 2345 AARNet/Internet:jwb@capek.rdt.monash.edu.au
-