On May 27, 2007 at 17:47, Ernie Bornn-Gilman said...
Just for my own curiosity: Does this kind of setup result
in DTMF or pulse dialing? If it's DTMF, what makes the
tones?
The Polycom unit, which is very common tele/video conferencing unit in commercial installations, is doing the dialing, he is just sending IR or 232 commands to tell the Polycom what to dial.
