Re: Phone line interface for DTMF

What kind of phone/phone system do you have at the office? If it's a
modern PBX, it probably uses digital phones that aren't compatible
with POTS.

JM

Indeed, nothing work when I connect my rig
between the phone set and the wall. But,
connected to the handset it almost works.
No humming, but not enough audio level!
The phone set is a Nortel Networks multilines,
and probalbly sure to use digital com...

With other coupling than Xfmr, like capacitors,
humming come on when using a headset rig
at the same time, and/or having a USB printer
tied to the computer (even with a laptop)...

I don't really bother exactly where I connect
the rig. My goal is only to avoid ground coupling,
for no humming, and good level of DTMF in
order to be properly detected by Telco.. or the Pbx.

Jmarc..


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