data call and greeting-message

"Robert J. Brown" (rj@eli.elilabs.com)
Tue, 23 Sep 1997 21:59:24 +0200
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>>>>> "Gert" == Gert Doering <gert@greenie.muc.de> writes:

 Gert> Hi, Robert J. Brown wrote:
 >> >>>>> "Matthias" == Matthias Prinz
 >> <matthias@Tintin.Rhein-Main.De> writes:
 >> 
 Matthias> If I understand the documentation right, a data-call
 Matthias> should be recognized while the message is played, even
 Matthias> in the latest version.
 >> If I am not mistaken, the answering modem is responsible for
 >> issuing the answer-back tone (first note of the "whale song"),
 >> and only then does the calling modem begin to send tones.

 Gert> Uh, this was true in 2400 baud age ... nowadays, all recent
 Gert> fax machines and modems send a calling tone (CNG) right
 Gert> after they have finished dialing. Voice modems recognize
 Gert> these tones, and signal them to the vgetty process
 Gert> (<DLE><something>), different codes for fax CNG or for data
 Gert> CNG.

 >> If this is true then it is not possible for the data call to be
 >> recognized while the voice greeting is being played, because
 >> the calling modem is silent until it hear that old familiar
 >> voice of those answer-back tones.

 Gert> Except for some oldish modems or manually-dialed fax
 Gert> machines, this should be no longer true.

Then vgetty *SHOULD* recognize the calling modem and stop the voice
greeting! Does it? Or is it now broken, as Matthias reported. He
said it used to work, but no longer does. I do not know, as I did not
understand the new behaviour of these modems, and I just this weekend
upgraded my vgetty to the latest version. BTW I am using a Zyxel
omni288s for voice traffic. What was Matthias using? Could it be a
device particular driver problem, or a general problem?

-- 
-------- "And there came a writing to him from Elijah" [2Ch 21:12] --------
Robert Jay Brown III rj@eli.elilabs.com http://www.elilabs.com 1 847 705-0424
Elijah Laboratories Inc.; 37 South Greenwood Avenue; Palatine, IL 60067-6328
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