Re: [hylafax-users] TAD Method

["Kevin P. Fleming" <kpfleming@xxxxxxxxxxxxxxx>]

Lee Howard wrote:

> I don't know how fax machines do it.  I mean, how do they "listen" to a 
> line without taking it off-hook?  I don't know.

They don't. They wait for some other extension to take the line 
off-hook, then they listen for CNG and go off-hook themselves if they 
hear it.

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