unusual telephony request - recording voice mail

[Peter L. Peres]

On Tue, 27 Jan 2004, James Knott wrote:

> I guess you've never taken a phone apart.  There is a network that
> connects the handset to the line.  It provides DC blocking for the
> receiver & current limiting to the microphone (for those that still need
> a power source).  Also the mic & receiver are not wired in parallel.
> Doing so would result in excessive "sidetone" level and echo.

I work with telco equipment often enough (PBX etc). *Inside* it, not
operating switches. What he did aint right. The network you are talking
about only limits the available current. Transformers are very seldomly
used in inexpensive unpowered phones.

Peter
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