Post by thread:caller-id,

> Here in North America, caller ID information is sent as standard 1200 baud > ASCII text between the first and second ring. The signals are exactly like > the ones used by your 1200 baud modem. >I haven't used a 1200bps modem in about 15 years. Can you even put a modern >modem (ie, the 2400bps ones you can get for $10 surplus?) into a dedicated >1200bps mode where it won't need to train/etc before receiving digits? Modern modems decode caller id directly. The tones occur between the first and second ring so no retrain is necessary. The caller id decoder kits available consist of a Motorola MC145447P caller id decoder chip and a MAX232 RS-232 driver. The 145447 could be hooked to a pic software or hardware UART (there I mentioned PICs :-) -- Best regards, Andy Burgess spam_OUTaabTakeThisOuTcichlid.com

In a message dated 96-11-23 21:39:55 EST, you write: >Modern modems decode caller id directly. The tones occur between the >first and second ring so no retrain is necessary. > >The caller id decoder kits available consist of a Motorola MC145447P >caller id decoder chip and a MAX232 RS-232 driver. The 145447 could >be hooked to a pic software or hardware UART (there I mentioned PICs :-) Are the caller id tones always transmitted or do the local phone companies block that info unless you buy there service? Are you only renting the box when you subscribe to their service? Mark A. Corio Rochester MicroSystems, Inc. 200 Buell Road, Suite 9 Rochester, NY 14624 Tel: (716) 328-5850 --- Fax: (716) 328-1144 http://www.frontiernet.net/~rmi/ ***** Designing Electronics For Research & Industry *****

At 10:19 AM 24/11/96 -0500, you wrote: >Are the caller id tones always transmitted or do the local phone companies >block that info unless you buy there service? Are you only renting the box >when you subscribe to their service? > >Mark A. Corio In Mexico the phone company blocks the signal, only subscribers get them. And the decoders are bought anywhere you want (even Radio Shack). I guess it's the same everywhere caller ID is offered since in digital phone centrals it is easy to route diferent services. Rogerio

> Are the caller id tones always transmitted or do the local phone companies > block that info unless you buy there service? Are you only renting the box > when you subscribe to their service? I'm not sure if the phone companies completely suppress the CID string or simply suppress the data within the string (I'm inclined to believe the former) but unless you subscribe to the service, you will get nothing useful. Also, the phone companies supply the service only; you must obtain your own decoder box (of course, you may be able to do that through your local telco). {Quote hidden}> > Mark A. Corio > Rochester MicroSystems, Inc. > 200 Buell Road, Suite 9 > Rochester, NY 14624 > Tel: (716) 328-5850 --- Fax: (716) 328-1144 > http://www.frontiernet.net/~rmi/ > > ***** Designing Electronics For Research & Industry ***** > Mark, I see you are in NYNEX territory, too. If you are considering subscribing to CID from them, you may want to be aware that there seems to be an inordinately high percentage of "Not Available" calls in (at least) my area (Long Island). I would say that at least 75% of the calls we get have no CID data available. Of course, this is NOT the fault of NYNEX; it just makes the service somewhat less useful than I had originally thought. Also, for any other deaf PICLIST subscribers out there in NYNEX land, be aware that all calls from the NY Relay Center will appear on your CID boxes as "NOT AVAILABLE"; i.e. NYRC apparently does NOT re-transmit the CID info of the callers TO the relay center, so you will not get the CID info for those callers. Philip Restuccia .....philip.restucciaKILLspam@spam@peri.com

In message <961124101910_571601410KILLspamemout12.mail.aol.com>, "Mark A. Corio" write s: >Are the caller id tones always transmitted or do the local phone companies >block that info unless you buy there service? Around here, Southwestern Bell sends absolutely nothing but 90 volts at 20 20 HZ unless you pay for the service which is around $7.00 on top of the usual bill. Martin McCormick