On Wed, 6 Jul 2016 12:18:00 -0400, "J.B. Wood"
wrote:

Hello, all. In addition to cellular service I still maintain a
copper-back-to-central office phone line at my residence. I've had this
for about 40 years and never had any problems - until now. Here are the
symptoms (same behavior on any one of 3 extension phones):

1. Phones ring as expected in response to calling party
2. Called party (me) can hear calling party
3. Calling party can't hear me
4. DTMF (Touchtone) phone keypads produce audio tones but won't break
dial tone.

I've got a call into Verizon on the above but am scratching my head as
to what might be causing all of this. Your thoughts would be most
appreciated. Sincerely,

At both ends of the 2 wire POTS line is a 2 wire to 4 wire hybrid
circuit, which deals with seperating the audio in both directions
while maintaining full duplex operation. My guess(tm) is that the
receive part of the hybrid circuit at the Verizon end is broken. Not
much you can do to solve the problem at your end.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558