1. Automatic telephone answering
machine
A thesis submitted in partial fulfilment of the requirement for
the degree of
Bachelor of technology In Electronics &
communication
by
Puspita Priyadarsini Nayak(0901335047),
Bhagyashree Nayak(0901335037),
Pragyan Pranati Mishra(0901335039),
Satabdi Mansingh(0901335043)
&
Subhan Pratim Jena(0901335051)
Under the guidance of Prof Satyasen Panda Department of
Electronics and communication Engineering Synergy Institute of
Technology, BBSR.

2. Automatic telephone answering machine
A thesis submitted in partial fulfilment of the requirement for
the degree of
Bachelor of technology In Electronics &
communication
by
PuspitaPriyadarsiniNayak(0901335047),
Bhagyashree Nayak(0901335037),
Pragyan Pranati Mishra(0901335039),
Satabdi Mansingh(0901335043)
&
Subhan Pratima Jena(0901335051)
Under the guidance of Prof Satyasen Panda Department of
Electronics and communication Engineering Synergy Institute of
Technology,BBSR

3. CERTIFICATE
This is to certify that the thesis entitled “Automatic Telephone
Answering Machine” submitted by PUSPITA P.
NAYAK,PRAGYAN P. MISHRA,SATABDI
MANSINGH,BHAGYASHREE NAYAK AND SUBHAN P. JENA Final
year student of Electronics & Communication Engineering, in
partial fulfilment of the requirements for the award of B.Tech
degree at SYNERGY INSTITUTE OF TECHNOLOGY,BBSR a
bonafide work carried out by them under my supervision and
guidance. To the best of my knowledge, the matter embodied
in the thesis has not been submitted to any other
university/institute for the award of any degree or diploma.
(Prof. Satyasen panda) Project Guide ECE Dept. Synergy Institute of
Technology ,bbsr
ACKNOWLEDGEMENT

4. We would like to articulate our and profound gratitude indebtedness to
those persons who helped us in completion of the project. The most
pleasant point of pre-sending a thesis is the opportunity to thank those
who contributed to it. First and foremost, we would like to convey our
obligation to our project guide Prof satyasen panda for his constant
motivation, valuable suggestions and timely inspirations throughout the
project duration. We are sincerely thankful to him for his esteemed
guidance and pain taking effort in improving our understanding on the
topic.We truly appreciate all our faculty members for providing a solid
background for our studies and research thereafter which helped a lot to
properly shape the problem and provided insights towards the solution.
They have been great sources of inspiration to us and we thank them from
the bottom of our heart always encouraged and helped us in the
successful completion of our thesis work.
Date-22.12.2012 Puspita P.Nayak
Sit,bbsr Satabdi Mansingh
Pragyan P. Mishra
Bhagyashree Nayak
Subhan pratima Jena

5. ABSTRACT
An automatic telephone answering machine or system is an electronic
device that answers automatically to an incoming telephone call and plays a
pre recorded message and is capable of recording a message the caller want
to leave. These systems include message recording system having remote
access to message playback, automatic dialing, equipment to receive an
alarm, automatic data entry-answering systems and other common
telephone devices being used along with modem equipments. The
microcontroller typically controls a number of peripherals, components of
the answering machine such as an LCD or LED display, an indicator light
for recording and playback options, a DTMF receiver and an audio
controller. A telephone answering machine must be capable of being
remotely activated consisting of:
 A switch deciding the mode of operation either automatic or normal
mode.
 Provis ion for receiving the calls automatically when in automatic mode.
 Provis for recording the message to be delivered to the incoming user
ion
and also to record his message
 Storage for the message
 Micro controller to deliver control signal as per the mode of operation
Commonly used telephone answering devices comprises of a number of
features which allow a user to examine the presence of a call, seize calls,
play back recorded voice messages, record an announcement etc.
Triggering of a telephone answering machine done by counting the
incoming ring signals and when the count surpass a preset number set by
the user. The machine is programmed in such a way that if the user does not
attain his telephone within a specified time period which is the function of
number of ring signals, the call is automatically answered and a message is
played back to the caller as well as asks him to leave a message.