I can hear the caller but caller cannot hear me on 29870GE1-A digital answering machine

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New service may be interupting your phone answering machine with a digital one provided by them. Call your number to verify what system is answering your calls for you. Speak to your phone service provider for further clarification

There a chance your machine recorded too many messages, which actually means, the memory is full and should be cleaned / wiped.
Check the manual or download it here and see for page 5 at subtitle deleting messages.

Plug the cord in for the answering machine. The answering machine does not have to be on though. Now, press the top volume button with the plus sign next to it. Do the opposite to lower the volume.

You could always simply turn the volume down? to the speaker, well as long as she uses the handset?

The receiving party will have to press START when they hear fax tones.

You can choose whether to hear the
announcement when your system answers
a call, or have it silent (off) on your end
(your caller will still hear an
announcement).
1 Press and hold "Setup". After the Ring
Select setting is announced, continue
to press and release "Setup" until the
system announces “Monitor is on (or
off)”.
2 Press and release "ANNC/SKIP"or "Memo/Repeat"
until the system announces your
selection.
3 Press and release "Play/Stop" or "Setup"
to exit.

Record Your Announcement
Before using this answering system, you
should record the announcement (up to
three minutes long) that callers will hear
when the system answers a call. If you
choose not to record an announcement,
the system answers with a pre-recorded
announcement: “HELLO. PLEASE LEAVE A
MESSAGE AFTER THE TONE.”
1 Press and hold a. When the
system beeps, speak toward the
microphone normally, from about nine
inches away. While you are recording,
the Message Window blinks .
To stop recording, release a.
The system automatically plays back
your announcement.
To review your announcement, press
and release a.
To erase your announcement and
return to the pre-recorded announcement,
press Dwhile your announcement is
playing.
Callers can skip the announcement by
pressing #.

Our phone decides to call screen people so the answering machine goes on after 2 rings. We can't find the manual.