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From: grn@stl.stc.co.uk (Gary Nebbett)
Newsgroups: comp.dcom.modems
Subject: Originating modems and calling tones
Message-ID: <1463@stl.stc.co.uk>
Date: 16 May 89 12:45:38 GMT
Sender: news@stl.stc.co.uk
Reply-To: grn@stl.stc.co.uk (Gary Nebbett)
Organization: STC Technology Limited, London Road, Harlow, Essex, UK
Lines: 9

Should a modem that originates a call send any tones?

We have a number of modems at STL, some of which do not seem to interwork. When
I use a modem to call a number which does not have an attached modem and listen
to the line I find that some modems send an intermittent tone whilst others are
silent. 

Looking at the V25 spec. I would expect the calling modem to generate "calling
tone" which should be a 1300Hz tone lasting 0.5-0.7s at 1.5-2.0s intervals.