kiely@lownlab.UUCP (James P. Kiely) (02/20/85)
I am trying to find an auto-dialing modem with call progress tone detection.
Specifically it should be able to sense:
dial tone
ringing (at either end)
busy signal
reorder signal (circuits busy)
call waiting tone
It should also be able to sense loop current to check for a dead line
and/or for disconnect.
Anybody know of anything that can do all (or most of) this?
Note: Reference "Electrical Characteristics of Bell System Network
Facilities at the Interface with Voiceband Ancillary
and Data Equipment", PUB 47001, ATT, Basking Ridge, NJ
NAME: James P. Kiely
USENET: ...!harvard!hscfvax!lownlab!kiely
USPS: Lown Cardiovascular Laboratory
Harvard School of Public Health
665 Huntington Avenue
Boston, Mass. 02115-9915henry@utzoo.UUCP (Henry Spencer) (02/26/85)
> I am trying to find an auto-dialing modem with call progress tone detection.
A number of modems claim to do this, but note that some botch it. There
is a great deal of variation in what tone signal means what, especially
when PBXes enter the picture. My own conclusion -- bearing in mind that
I'm a phone/modem user rather than designer -- was that the general problem
is so hard that probably no modem does it 100% correctly.
I have no specific pointers, except that I know that some (all?) Cermetek
products -- which are also sold by other companies under different names --
misinterpret the "ringing" signal of at least one major PBX as "busy".
--
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henrydave@lsuc.UUCP (David Sherman) (02/27/85)
The Racal-Vadic 212PA does a pretty good job of
detecting call progress. On the whole, it correctly identifies
"NO ANSWER", "DIAL TONE", "RINGING", "BUSY" and "VOICE".
And if it doesn't get a dial tone for the call, it will let
you know too.
Dave Sherman
Toronto
--
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