Telephone terminal equipment in which telephone numbers of callers are displayed

A telephone terminal equipment consists of a ring signal detecting circuit for detecting ring signals transferred from a caller, a ring tone generating circuit for generating ring tones output from a speaker when the ring signals are detected in the ring tone generating circuit, a telephone number detecting circuits for detecting a telephone number of the caller, a memory circuit for storing the telephone number detected in the telephone number detecting circuit, a ring signal termination detecting circuit for detecting termination of the ring signals in cases where a subscriber make no response to the caller, a control circuit for controlling the memory circuit to store a no-response code in relation to the telephone number in cases where the termination of the ring signals is detected in the ring signal termination detecting circuit, a displaying circuit for displaying both the telephone number and a no-response mark relating to the no-response code stored together in the memory circuit. Because both the telephone number and the no-response mark are displayed in the displaying circuit, the subscriber can judge whether a response to the caller is required.

BACKGROUND OF THE INVENTION 
1. FIELD OF THE INVENTION 
The present invention relates generally to a telephone terminal equipment 
in which telephone numbers of callers are displayed, and more particularly 
to a telephone terminal equipment in which telephone numbers relating to 
no-response are explicitly displayed. 
2. DESCRIPTION OF THE RELATED ART 
When a caller give a telephone call to a subscriber, a ring signal and a 
piece of telephone number data indicating a telephone number of the caller 
are conventionally sent together to the subscriber. The telephone number 
data of the caller is added to the ring signal at a telephone exchange as 
a service. Thereafter, the telephone number of the caller is displayed on 
a telephone set of the subscriber after the telephone number data is 
decoded to the telephone number of the caller. Therefore, the subscriber 
can identify the caller before the subscriber takes up a handset of the 
telephone unit to place a call. 
Accordingly, an unnecessary telephone communication with the caller can be 
prevented to save the time because the subscriber can identify the caller 
without communicating with the caller. 
Also, because the telephone number of the caller is displayed on the 
telephone set of the subscriber, usage of telephone communication for the 
wrong purpose can be reduced. 
Previously Proposed Art 
A conventional telephone unit is described with reference to FIG. 1. 
FIG. 1 is a block diagram of a conventional telephone unit. 
As shown in FIG. 1, a conventional telephone unit 11 at a subscriber's side 
is provided with a ring signal detecting circuit 12 for detecting a ring 
signal transferred from a telephone exchange (not shown) through telephone 
lines 13, a ringing tone generating circuit 14 for generating ringing 
tones when the ring signal is detected in the ring signal detecting 
circuit 12, a speaker 15 for outputting the ringing tones generated in the 
ringing tone generating circuit 14, a telephone number detecting circuit 
16 for detecting a piece of telephone number data indicating a telephone 
number of a caller, a control circuit 17 including a microcomputer for 
decoding the telephone number data to the telephone number, a memory 
circuit 18 for storing the telephone number decoded in the control circuit 
17 under control of the control circuit 17, a displaying circuit 19 
including a liquid crystal display (LCD) for displaying the telephone 
number decoded in the control circuit 17 under control of the control 
circuit 17, and a handset 20 detachably attached on a hook switch 21. 
In the above configuration, the conventional telephone unit 11 is usually 
in a waiting mode which corresponds to a on-hook condition in which the 
handset 20 is attached on the hook switch 21 to wait for a telephone call. 
When a caller dials to give a telephone call to the subscriber, a dial 
signal is transferred to the telephone exchange. Thereafter, the 
conventional telephone unit 11 at the subscriber's side is specified in 
the telephone exchange because the dial signal designates the unit 11. 
Therefore, a series of ring signals is generated in the telephone 
exchange, and a piece of telephone number data indicating the telephone 
number of the caller is added so as to follow a first ring signal of the 
ring signals in the telephone exchange. Thereafter, the ring signals and 
the telephone number data are transferred to the conventional telephone 
unit 11 through the telephone lines 13. Therefore, each of the ring 
signals is intermittently detected in the ring signal detecting circuit 
12, and the telephone number data indicating the telephone number of the 
caller is detected in the telephone number detecting circuit 16. 
When the first ring signal is detected in the ring signal detecting circuit 
12, a detecting signal is transferred from the ring signal detecting 
circuit 12 to the control circuit 17. Also, the detecting signal is 
transferred to the ringing tone generating circuit 14 each time one of the 
ring signals is detected in the ring signal detecting circuit 12. 
Thereafter, a ringing tone is generated in the ringing tone generating 
circuit 14 each time the detecting signal is received in the ringing tone 
generating circuit 14. Therefore, ringing tones are intermittently output 
from the speaker 15. 
When the telephone number data is detected in the telephone number 
detecting circuit 16, the telephone number data is transferred to the 
control circuit 17. In this case, because the detecting signal has been 
already received in the control circuit 17, the telephone number data is 
promptly decoded to a telephone number of the caller, and the telephone 
number is stored in the memory circuit 18 under the control of the control 
circuit 18. Also, the telephone number is promptly displayed on a liquid 
crystal display of the display circuit 19. 
The conventional telephone unit 11 is additionally provided with an 
interface circuit 22 through which the handset 20 is connected with the 
telephone lines 13 under control of the control circuit 17, a receiving 
circuit 23 for transmitting an aural signal transferred from the caller to 
a receiver of the handset 20 through the telephone lines 13 and the 
interface circuit 22, a transmitting circuit 24 for transmitting another 
aural signal of the subscriber input in a microphone of the handset 20 to 
the caller through the interface circuit 22 and the telephone lines 13, 
and a displaying switch 25 operated by the subscriber to display all of 
telephone numbers stored in the memory circuit 18 on the liquid crystal 
display of the displaying circuit 19. 
In the above configuration, in cases where the handset 20 is in the on-hook 
condition, the handset 20 is disconnected with the telephone lines 13 
under control of the control circuit 17. In contrast, when the subscriber 
hears the ringing tones output from the speaker 15, the subscriber looks 
at the telephone number displayed on the liquid crystal display of the 
displaying circuit 19 and takes up the handset 20 attached on the hook 
switch 21 to talk with the caller. At this time, the hook switch 21 is 
switched on, and a switch-on signal is transferred from the hook switch 21 
to the control circuit 17. Therefore, the handset 20 is set to an off-hook 
condition. That is, the interface circuit 22 is controlled by the control 
circuit 17 to connect the handset 20 to the telephone lines 13. Also, the 
generation of the ringing tones in the ringing tone generating circuit 14 
is stopped under control of the control circuit 17. Therefore, the output 
of the ringing tones in the speaker 15 is stopped. 
When the handset 20 is set to the off-hook condition, an aural signal 
indicating a voice of the caller is transferred to the receiving circuit 
23 through the interface circuit 22 so that the voice of the caller is 
output from the receiver of the handset 20. Also, a voice of the 
subscriber received in the microphone of the handset 20 is converted into 
an aural signal of the subscriber in the transmitting circuit 24, and the 
sound signal of the subscriber is transferred to the caller through the 
interface circuit 22 and the telephone lines 13. Therefore, the subscriber 
can talk with the caller in a two-way conversation. 
In addition, a plurality of telephone numbers of callers are automatically 
stored one by one in the memory circuit 18 in the order of telephone calls 
regardless of whether the handset 20 is set in the off-hook condition. 
Also, when the subscriber leaves his house, the subscriber can set the 
conventional telephone unit 11 from the waiting mode to an absent mode. 
Therefore, in cases where the conventional telephone unit 11 is in the 
absent mode, each of the telephone numbers is automatically stored in the 
memory circuit 18 with a reference code indicating the absent mode. In 
this case, when the subscriber returns home, the subscriber can identify 
the telephone numbers stored in the absent mode by pushing down the 
displaying switch 25. In other words, the subscriber can distinguish the 
telephone numbers stored in the absent mode from the telephone numbers 
stored in the waiting mode. 
Problems to be Solved by the Invention 
However, in cases where the subscriber often leaves his house, it is 
troublesome to set the conventional telephone unit 11 to the absent mode. 
Therefore, the subscriber does not set the unit 11 to the absent mode as a 
practical matter when the subscriber leaves his house. In this case, when 
the subscriber is absent, the subscriber makes no response to telephone 
calls of callers having first telephone numbers. Therefore, the first 
telephone numbers relating to no-response are automatically stored one by 
one in the memory circuit 18 in the waiting mode. In contrast, when the 
subscriber is in home, the subscriber makes a response to each of 
telephone calls of callers having second telephone numbers. Therefore, the 
second telephone numbers corresponding to responded telephone calls are 
automatically stored one by one in the memory circuit 18 in the waiting 
mode. As a result, the first telephone numbers relating to no-response and 
the second telephone numbers corresponding to responded telephone calls 
are mingled together. 
Accordingly, because all of the telephone numbers stored in the memory 
circuit 18 are displayed in the same waiting mode, there is a first 
drawback that the subscriber cannot distinguish the first telephone 
numbers relating to no-response from the second telephone numbers 
corresponding to responded telephone calls. That is, even though the 
subscriber intends to give telephone calls to the callers having the first 
telephone numbers relating to no-response, the subscriber cannot select 
the first telephone numbers. 
Also, there is a case that the conventional telephone unit 11 is 
additionally provided with a tape recorder which automatically record a 
voice of a caller in the absent mode. In this case, even though the caller 
gives a telephone call to the subscriber when the subscriber is absent, 
the subscriber can hear the voice of the caller with the tape recorder 
when the subscriber returns home. 
However, the telephone number of the caller is stored in the memory circuit 
19 regardless of whether the voice of the caller is recorded in the tape 
recorder. Accordingly, even though the conventional telephone unit 11 is 
set to the absent mode each time the subscriber leaves his house, there is 
a second drawback that the subscriber cannot distinguish telephone numbers 
of callers whose voices are recorded in the tape recorder from telephone 
numbers of callers whose voices are not recorded in the tape recorder. 
SUMMARY OF THE INVENTION 
A first object of the present invention is to provide, with due 
consideration to the drawbacks of such a conventional telephone unit, a 
telephone terminal equipment in which a subscriber distinguishes telephone 
numbers relating to no-response telephone calls from telephone numbers 
relating to responded telephone calls. 
Also, a second object of the present invention is to provide a telephone 
terminal equipment in which a subscriber distinguishes telephone numbers 
of callers whose voices are recorded in a tape recorder from telephone 
numbers of callers whose voices are not recorded in the tape recorder. 
The first object is achieved by the provision of a telephone terminal 
equipment, comprising: 
ring signal detecting means for detecting ring signals relating to a 
telephone call of a caller to a subscriber; 
telephone number detecting means for detecting a telephone number of the 
caller transferred with the ring signals detected by the ring signal 
detecting means; 
memory means for storing the telephone number detected by the telephone 
number detecting means; 
control means for controlling the memory means to store no-response 
information in relation to the telephone number in the memory means, the 
no-response information indicating that the subscriber makes no response 
to the telephone call of the caller; and 
displaying means for displaying both the telephone number stored in the 
memory means and the no-response information relating to the telephone 
number in the memory means. 
In the above configuration, when a caller gives a telephone call to a 
subscriber, a series of ringing signals is provided to the telephone 
terminal equipment at a subscriber's side through telephone lines. 
Therefore, the ring signals are detected by the ring signal detecting 
means. Thereafter, ring tones are intermittently output from a speaker to 
inform the subscriber of the telephone call. Also, a telephone number of 
the caller is transferred to the telephone terminal equipment. Therefore, 
the telephone number is detected in the telephone number detecting means, 
and the telephone number is stored in the memory means. 
Thereafter, in cases where the subscriber does not take up the handset, the 
caller stops giving the telephone call to the subscriber after a time. In 
this case, no-response information is stored in the memory means while 
relating to the telephone number under the control of the control means. 
Also, the telephone number and the no-response information stored together 
in the memory means are displayed in the displaying means. 
Therefore, in cases where a large number of telephone calls are given one 
by one to the telephone terminal equipment at a subscriber's side, the 
no-response information is displayed with only the telephone numbers 
relating to the telephone calls to which the subscriber make no response. 
Accordingly, the subscriber can easily judge whether or not the subscriber 
makes a response to each of the telephone calls relating to the telephone 
numbers displayed in the displaying means. 
In addition to the above configuration, the telephone terminal equipment 
includes ring signal termination detecting means for detecting termination 
of the ring signals detected by the ring signal detecting means, the 
no-response information being stored in the memory means under the control 
of the control means in cases where the termination of the ring signals is 
detected in the ring signal termination detecting means. 
In the above configuration, in cases where the subscriber does not take up 
the handset when the caller gives a telephone call to the subscriber, the 
caller stops giving the telephone call to the subscriber after a time so 
that the ring signals are not detected any more in the ring signal 
detecting means. Therefore, the termination of the ring signal is detected 
in the ring signal termination detecting means, and no-response 
information is stored in the memory means while relating to the telephone 
number under the control of the control means. Also, the telephone number 
and the no-response information stored together in the memory means are 
displayed in the displaying means. 
In contrast, in cases where the subscriber takes up a handset to make a 
response to the telephone call when the caller gives a telephone call to 
the subscriber, termination of the ring signals detected in the ring 
signal detecting means is not detected in the ring signal termination 
detecting means. Therefore, any piece of no-response information is not 
stored in the memory means. That is, only the telephone number is stored 
in the memory means. Also, only the telephone number stored in the memory 
means is displayed in the displaying means. 
Therefore, in cases where a large number of telephone calls are given one 
by one to the telephone terminal equipment at a subscriber's side, the 
no-response information is displayed with only the telephone numbers 
relating to the telephone calls to which the subscriber make no response. 
Accordingly, the subscriber can easily judge whether or not the subscriber 
makes a response to each of the telephone calls relating to the telephone 
numbers displayed in the displaying means. 
Also, the first object is achieved by the provision of a telephone terminal 
equipment, comprising: 
ring signal detecting means for detecting ring signals relating to a 
telephone call of a caller to a subscriber; 
telephone number detecting means for detecting a telephone number of the 
caller transferred with the ring signals detected by the ring signal 
detecting means; 
memory means for storing the telephone number detected by the telephone 
number detecting means; 
voice recognizing means for recognizing a voice given in a telephone 
conversation between the subscriber and the caller; 
elapsed time counting means for counting an elapsed time of the telephone 
conversation recognized in the voice recognizing means; 
judging and controlling means for judging whether or not the elapsed time 
counted in the elapsed time counting means reaches a minimum conversation 
time and controlling the memory means to store no-response information in 
relation to the telephone number in the memory means in cases where the 
elapsed time counted in the elapsed time counting means reaches the 
minimum conversation time; and 
displaying means for displaying the telephone number stored in the memory 
means and the no-response information stored in the memory means under 
control of the judging and controlling means. 
In the above configuration, when a caller gives a telephone call to a 
subscriber, a series of ringing signals is provided to the telephone 
terminal equipment at a subscriber's side through telephone lines. 
Therefore, the ring signals are detected by the ring signal detecting 
means one by one. Thereafter, ring tones are intermittently output from a 
speaker to inform the subscriber of the telephone call. Also, a telephone 
number of the caller is transferred to the telephone terminal equipment. 
Therefore, the telephone number is detected in the telephone number 
detecting means, and the telephone number is stored in the memory means. 
Thereafter, when the subscriber takes up a handset, a telephone 
conversation is started. At this time, a voice given in the telephone 
conversation is recognized in the voice recognizing means, and an elapsed 
time of the telephone conversation is counted in the elapsed time counting 
means. 
Thereafter, in cases where the voice given in the telephone conversation is 
not recognized any more in the voice recognizing means before the elapsed 
time reaches a minimum conversation time it is judged in the judging and 
controlling means that the telephone conversation is unsuccessfully over. 
Therefore, a piece of no-response information is stored in the memory 
means in relation to the telephone number. Also, the telephone number and 
the no-response information stored together in the memory means are 
displayed in the displaying means. 
In contrast, in cases where the voice given in the telephone conversation 
is continuously recognized in the voice recognizing means until the 
elapsed time reaches the minimum conversation time, it is judged in the 
judging and controlling means that the telephone conversation is 
successfully over. In this case, any piece of no-response information is 
not stored in the memory means. Thereafter, only the telephone number 
stored in the memory means is displayed in the displaying means. 
Therefore, in cases where a large number of telephone calls are given one 
by one to the telephone terminal equipment at a subscriber's side, the 
no-response information is displayed with the telephone numbers relating 
to the telephone calls in which the telephone conversation is 
unsuccessfully over. 
Accordingly, the subscriber can easily judge whether or not the telephone 
conversation is successfully performed in each of the telephone calls 
relating to the telephone numbers displayed in the displaying means. 
Also, the first object is achieved by the provision of a telephone terminal 
equipment, comprising: 
ring signal detecting means for detecting ring signals relating to a 
telephone call of a caller to a subscriber; 
telephone number detecting means for detecting a telephone number of the 
caller transferred with the ring signals detected by the rink signal 
detecting means; 
memory means for storing the telephone number detected by the telephone 
number detecting means; 
ring signal termination detecting means for detecting termination of the 
ring signals detected by the ring signal detecting means in cases where 
the caller stops giving the telephone call to the subscriber before the 
subscriber makes a response to the telephone call of the caller; 
voice recognizing means for recognizing a voice given in a telephone 
conversation between the subscriber and the caller in cases where the 
subscriber makes a response to the telephone call of the caller before the 
caller stops giving the telephone call to the subscriber; 
elapsed time counting means for counting an elapsed time of the telephone 
conversation recognized in the voice recognizing means; 
judging means for judging whether or not the elapsed time counted in the 
elapsed time counting means reaches a minimum conversation time; 
control means for controlling the memory means to store a piece of 
no-response information in relation to the telephone number in the memory 
means in cases where the termination of the ring signals detected in the 
ring signal detecting means is detected in the ring signal termination 
detecting means or in cases where the elapsed time counted in the elapsed 
time counting means does not reach the minimum conversation time, the 
no-response information indicating that the subscriber makes no response 
to the telephone call of the caller or that the telephone conversation is 
unsuccessfully over; and 
displaying means for displaying the telephone number stored in the memory 
means and the no-response information stored in the memory means. 
In the above configuration, when a caller gives a telephone call to a 
subscriber, a series of ringing signals is provided to the telephone 
terminal equipment at a subscriber's side through telephone lines. 
Therefore, the ring signals are detected by the ring signal detecting 
means one by one. Thereafter, ring tones are intermittently output from a 
speaker to inform the subscriber of the telephone call. Also, a telephone 
number of the caller is transferred to the telephone terminal equipment. 
Therefore, the telephone number is detected in the telephone number 
detecting means, and the telephone number is stored in the memory means. 
Thereafter, in cases where the caller stops giving the telephone call to 
the subscriber before the subscriber makes a response to the telephone 
call of the caller, the ring signals are not detected any more in the ring 
signal detecting means. Therefore, the termination of the ring signal is 
detected in the ring signal termination detecting means, and a piece of 
no-response information is stored in the memory means under the control of 
the control means in relation to the telephone number stored in the memory 
means. In this case, the no-response information indicates that the 
subscriber makes no response to the telephone call of the caller. 
In contrast, in cases where the subscriber makes a response to the 
telephone call of the caller before the caller stops giving the telephone 
call to the subscriber, a telephone conversation is started. At this time, 
a voice given in the telephone conversation is recognized in the voice 
recognizing means, and an elapsed time of the telephone conversation is 
counted in the elapsed time counting means. Thereafter, in cases where the 
voice given in the telephone conversation is not recognized any more in 
the voice recognizing means before the elapsed time reaches a minimum 
conversation time, it is judged in the judging means that the elapsed time 
counted in the elapsed time counting means does not reach the minimum 
conversation time. Therefore, a piece of no-response information is stored 
in the memory means in relation to the telephone number under the control 
of the control means. In this case, the no-response information indicates 
that the telephone conversation is unsuccessfully over. 
Thereafter, the telephone number and the no-response information stored 
together in the memory means are displayed in the displaying means. 
Therefore, in cases where a large number of telephone calls are given one 
by one to the telephone terminal equipment at a subscriber's side, the 
no-response information is displayed with only the telephone numbers 
relating to the telephone calls to which the subscriber make no response 
or unsuccessful conversation is performed. 
Accordingly, the subscriber can easily judge whether or not a response call 
to the caller is required to each of the telephone calls relating to the 
telephone numbers displayed in the displaying means. 
The second object is achieved by the provision of a telephone terminal 
equipment, comprising: 
ring signal detecting means for detecting ring signals relating to a 
telephone call of a caller to a subscriber; 
telephone number detecting means for detecting a telephone number of the 
caller transferred with the ring signals detected by the ring signal 
detecting means; 
memory means for storing the telephone number detected by the telephone 
number detecting means; 
response message sending means for sending out a response message of the 
subscriber to the caller in cases where the ring signals are detected in 
the ring signal detecting means, the response message being recorded in a 
recorder in advance; 
incoming message recording means for recording an incoming message of the 
caller after the response message of the subscriber is sent out from the 
response message sending means, the incoming message of the caller being 
transferred through telephone lines in a form of aural signals; 
aural signal distinguishing means for distinguishing the aural signals 
forming the incoming message of the caller recorded in the incoming 
message recording means from various types of signals transferred through 
the telephone lines; 
judging and control means for judging whether or not the aural signals are 
distinguished in the aural signal distinguishing means, controlling the 
memory means to store a piece of recording information in relation to the 
telephone number stored in the memory means in cases where it is judged 
that the aural signals are distinguished in the aural signal 
distinguishing means, and controlling the incoming message recording means 
to stop recording the incoming message of the caller in cases where it is 
Judged that the aural signals are not distinguished any more in the aural 
signal distinguishing means; and 
displaying means for displaying both the telephone number stored in the 
memory means and the recording information relating to the telephone 
number in the memory means. 
In the above configuration, when a caller gives a telephone call to a 
subscriber, a series of ringing signals is provided to the telephone 
terminal equipment at a subscriber's side through telephone lines. 
Therefore, the ring signals are detected by the ring signal detecting 
means one by one. Thereafter, ring tones are intermittently output from a 
speaker to inform the subscriber of the telephone call. Also, a telephone 
number of the caller is transferred to the telephone terminal equipment. 
Therefore, the telephone number is detected in the telephone number 
detecting means, and the telephone number is stored in the memory means. 
Thereafter, in cases where the telephone call is given to the subscriber in 
the absence of the subscriber, the subscriber cannot take up a handset. In 
this case, because a response message of the subscriber is recorded in a 
recorder of the response message sending means, the response message of 
the subscriber is automatically sent out to the caller from the response 
message sending means. Therefore, the caller is informed of the 
subscriber's absence. In addition, after the response message of the 
subscriber is automatically sent out to the caller, the incoming message 
recording means is automatically operated to record an incoming message of 
the caller. Therefore, in cases where the caller intends to give the 
incoming message of the caller to the subscriber, the incoming message of 
the caller can be recorded in a recorder of the incoming message recording 
means. The incoming message of the caller is transferred through the 
telephone lines in the form of aural signals. 
Thereafter, the aural signal distinguishing means is automatically operated 
to distinguish the aural signals forming the incoming message of the 
caller from various types of signals transferred through the telephone 
lines. The various types of signals are generally the aural signals, busy 
tone signals, and silent tone signals, and each of the various types of 
signals is transferred by turns. During the operation of the incoming 
message recording means, it is judged in the judging and control means 
whether or not the aural signals are distinguished in the aural signal 
distinguishing means. 
When it is Judged that the aural signals are distinguished in the aural 
signal distinguishing means, the judgement means that the incoming message 
of the caller is recorded in the recorder of the incoming message 
recording means. Therefore, a piece of recording information is stored in 
the memory means in relation to the telephone number under the control of 
the judging and control means, and the operation of the incoming message 
recording means is continued to record the incoming message of the caller. 
After a time, when the caller stops giving the incoming message to the 
subscriber, it is judged that the aural signals are not distinguished any 
more in the aural signal distinguishing means. Therefore, the operation of 
the incoming message recording means is stopped under the control of the 
judging and control means. 
Thereafter, the telephone number and the recording information stored 
together in the memory means are displayed in the displaying means. 
Therefore, in cases where a large number of telephone calls are given one 
by one to the telephone terminal equipment at a subscriber's side, the 
incoming message recording means is automatically operated when the 
subscriber is absent, and the recording information is stored in the 
memory means in relation to each of specific telephone numbers of specific 
callers of which incoming messages are recorded in the recorder of the 
incoming message recording means. 
Accordingly, the subscriber can easily judge whether or not the incoming 
calls of the specific callers are recorded in the recorder of the incoming 
message recording means when the subscriber displays the specific 
telephone numbers of the specific callers in the displaying means.

DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Preferred embodiments of a telephone terminal equipment according to the 
present invention are described with reference to drawings. 
Constructional elements shown in following drawings which agree with the 
constructional elements shown in FIG. 1 are denoted by the same reference 
numerals as those shown in FIG. 1. 
FIG. 2 is a block diagram of a telephone terminal equipment according to a 
first embodiment of the present invention. FIG. 3 is a flow chart of a 
telephone call receiving operation performed in the telephone terminal 
equipment 31 shown in FIG. 2. 
As shown in FIG. 2, a telephone terminal equipment 31 at a subscriber's 
side comprises the ring signal detecting circuit 12, the ringing tone 
generating circuit 14, the speaker 15, the telephone number detecting 
circuit 16, the memory circuit 18, the displaying circuit 19, the handset 
20, the hook switch 21, the interface circuit 22, the receiving circuit 
23, the transmitting circuit 24, the displaying switch 25, a ring signal 
termination detecting circuit 32 for detecting the termination of a series 
of ring signals which are detected in the ring signal detecting circuit 
12, a response-transmission switch 33 for performing a 
response-transmission operation in which a telephone call is given to a 
specific caller relating to a specific telephone number selected from 
among the telephone numbers stored in the memory circuit 18, a dial signal 
sending circuit 34 for sending out a dial signal corresponding to the 
specific telephone number to give the telephone call relating to the 
response-transmission operation performed in the transmitting switch 33, 
and a control circuit 35 including a microcomputer for receiving various 
signals from the ring signal detecting circuit 12, the telephone number 
detecting circuit 16, the memory circuit 18, the hook switch 21, the 
displaying switch 25, and the response-transmission switch 33, and 
controlling the ringing tone generating circuit 14, the memory circuit 18, 
the displaying circuit 19, the interface circuit 22, and the dial signal 
sending circuit 34. 
In the above configuration, a telephone call receiving operation in which a 
telephone call given from a caller is received in the telephone terminal 
equipment 31 is initially described. 
The telephone terminal equipment 31 is usually set in a waiting mode in 
which the handset 20 is attached on the hook switch 21 in the on-hook 
condition to wait for a telephone call. When a caller gives a telephone 
call to the subscriber, ring signals are intermittently provided to the 
telephone terminal equipment 31 at the subscriber's side. Also, a piece of 
telephone number data subsequent to a first ring signal among the ring 
signals is provided to the telephone terminal equipment 31. 
As shown in FIG. 3, each time one of the ring signals is detected in the 
ring signal detecting circuit 12 in a step 101, a ringing tone is 
generated in the ringing tone generating circuit 14 in a step 102. 
Therefore, the ringing tone is output from the speaker 15. In this case, 
because the ringing signals are intermittently detected in the ring signal 
detecting circuit 12, a plurality of ringing tones are intermittently 
generated in the ringing tone generating circuit 14 until the subscriber 
takes up the handset 20. 
Also, a piece of telephone number data subsequent to the first ring signal 
is detected in the telephone number detecting circuit 16, and the 
telephone number data is transferred from the circuit 16 to the control 
circuit 35 to decode the telephone number data to the telephone number. 
Thereafter, the telephone number of the caller is stored in the memory 
circuit 18 in a step 103 with a piece of order information indicating the 
order of incoming calls. Also, the telephone number is displayed on a 
liquid crystal display of the displaying circuit 19 under control of the 
control circuit 35 in the step 103. 
Thereafter, it is judged in the control circuit 35 whether or not the 
handset 20 is attached on the hook switch 21 in the off-hook condition (a 
step 104). Also, in cases where the subscriber does not lift the handset 
20 in the step 104, it is judged in the control circuit 35 whether or not 
the ring signals are intermittently detected in the ring signal detecting 
circuit 12 (a step 105). 
When the subscriber takes up the handset 20 after one or more ringing tones 
are output from the speaker 15, the hook switch 21 is switched on, and the 
handset 20 is changed to the off-hook condition. Therefore, an off-hook 
signal is transferred from the hook switch 21 to the control circuit 35, 
and it is judged in the control circuit 35 that the handset 20 is changed 
to the off-hook condition. As a result, the telephone call receiving 
operation proceeds from the step 104 to a step 106. 
In the step 106, the interface circuit 22 is controlled by the control 
circuit 35 to connect the telephone lines 13 to the receiving and 
transmitting circuits 23, 24 through the interface circuit 22. Therefore, 
the subscriber can talk with the caller in the two-way conversation in the 
step 106. Also, a response code is attached to the telephone number stored 
in the memory circuit 18 to specify a piece of response information. Also, 
it is judged in the control circuit 35 during the conversation whether or 
not the handset 20 is changed to the on-hook condition (a step 107). 
Thereafter, when the conversation between the subscriber and the caller is 
over, the handset 20 is put back on the hook switch 21 so that the handset 
20 is changed to the on-hook condition. Therefore, an on-hook signal is 
transferred from the hook switch 21 to the control circuit 35, and it is 
judged in the control circuit 35 that the handset 20 is changed to the 
on-hook condition. Therefore, the telephone call receiving operation 
proceeds from the step 107 to a step 108. In the step 108, the interface 
circuit 22 is controlled by the control circuit 35 to disconnect the 
telephone lines 13 with the receiving and transmitting circuits 23, 24. As 
a result, the telephone terminal equipment 31 is again set in the waiting 
mode. 
In contrast, when the caller stops to give the telephone call to the 
subscriber before the subscriber lifts the handset 20, the arrival of the 
ring signals to the ring signal detecting circuit 12 is stopped. 
Therefore, the termination of the ring signals is detected in the ring 
signal termination detecting circuit 32, and a termination signal is 
transferred from the ring signal termination detecting circuit 32 to the 
control circuit 35. As a result, it is judged in the control circuit 35 
that the ring signals are not detected any more in the ring signal 
detecting circuit 12 (the step 105). Therefore, the telephone call 
receiving operation proceeds from the step 105 to a step 109. The 
detection of the termination of the ring signals is described in detail 
with reference to FIG. 4. 
FIG. 4 shows waveform of a series of ring signals transferred from the 
telephone exchange to the telephone terminal equipment 31 shown in FIG. 2. 
As shown in FIG. 4, the ring signals intermittently arrive at the telephone 
terminal equipment 31. Each of the ring signals consists of an alternate 
current signal which has an electric voltage 120 V and continues for a 
vibrating period T.sub.1. Also, the ring signals are spaced to each other 
a silent period T.sub.2. Each of leading edges in the ring signals is 
detected by the ring signal termination detecting circuit 32. When a ring 
signal S.sub.1 is provided to the ring signal detecting circuit 12, an 
elapsed time Te.sub.1 starting at a leading edge of the ring signal 
S.sub.1 is counted in the ring signal termination detecting circuit 32 
until a set-up time T.sub.3 sufficiently longer than a cycle interval 
T.sub.1 +T.sub.2 elapses or another leading edge of a ring signal S.sub.2 
subsequent to the ring signal S.sub.1 is detected in the ring signal 
termination detecting circuit 32. When the leading edge of the ring signal 
S.sub.2 is detected in the ring signal termination detecting circuit 32, 
the count of the elapsed time Te.sub. 1 is stopped, and another elapsed 
time Te.sub.2 starting at the leading edge of the ring signal S.sub.2 is 
newly counted in the ring signal termination detecting circuit 32 until 
the set-up time T.sub.3 elapses or another leading edge of a ring signal 
S.sub.3 subsequent to the ring signal S.sub.2 is detected in the ring 
signal termination detecting circuit 32. 
Accordingly, because the detection of the ring signals is stopped in cases 
where the caller stops to give a telephone call to the subscriber, the 
count of a latest elapsed time is stopped when the set-up time T.sub.3 
elapses in the ring signal termination detecting circuit 32. At this time, 
the termination of the ring signals is detected in the ring signal 
termination detecting circuit 32, and the termination of the ring signals 
is informed the control section 35. 
Therefore, the telephone call receiving operation proceeds to the step 109. 
In the step 109, a piece of no-response code is attached to the telephone 
number stored in the memory circuit 18 to specify a piece of response 
information. Thereafter, the telephone call receiving operation is 
accomplished in the above steps regardless of whether the subscriber takes 
up the handset 20. 
FIG. 5 conceptually shows pieces of order information, telephone numbers, 
pieces of response information stored in the memory circuit 18. 
As shown in FIG. 5, each time an incoming call is given to the telephone 
terminal equipment 31, a set of the order information indicating the order 
of incoming calls, a telephone number relating to an incoming call, and 
the response information designated by the response code "1" or the 
no-response code "0" are stored in the memory circuit 18 in the order of 
incoming calls. 
FIGS. 6A, 6B respectively show telephone numbers displayed on the liquid 
crystal display of the displaying circuit 19 in the order of incoming 
calls according to a telephone number displaying operation. 
As shown in FIGS. 6A, 6B, when the subscriber pushes down the displaying 
switch 25, telephone numbers Nt (Nt.sub.1, Nt.sub.2, - - - ) and 
no-response codes "0" of the response information are read out from the 
memory circuit 18, and the telephone numbers Nt and no-response marks Mn 
relating to the no-response codes "0" are displayed on the liquid crystal 
display of the displaying circuit 19 in the order of incoming calls under 
the control of the control circuit 35. For example, in cases where the 
subscriber does not respond to the caller having the telephone number 
Nt.sub.2, one of the no-response marks Mn is displayed at the head of the 
telephone number Nt.sub.2. 
Accordingly, even though the subscriber does not respond to a telephone 
call given by a specific caller, the subscriber can identify a specific 
telephone number relating to the specific caller because the specific 
telephone number can be displayed with the no-response mark Mn attached to 
the specific telephone number on the liquid crystal display of the 
displaying circuit 19 when the subscriber pushes down the displaying 
switch 25. 
In addition, one of the telephone numbers Nt is designated by a designation 
underline Ld. Also, the designation underline Ld can be moved to any 
telephone number according to a scroll operation performed by the 
subscriber. For example, as shown in FIGS. 6A, 6B, the telephone number 
Nt.sub.1 designated by the designation underline Ld can be changed to the 
telephone number Nt.sub.2. 
Also, in cases where the subscriber pushes down the response-transmission 
switch 33 on condition that the telephone number Nt.sub.2 is, for example, 
designated by the designation underline Ld shown in FIG. 6B, a 
response-transmission operation can be performed in the telephone terminal 
equipment 31. That is, the telephone number Nt.sub.2 designated by the 
designation underline Ld is read out from the memory circuit 18 to the 
control circuit 35. Thereafter, a dial signal relating to the telephone 
number Nt.sub.2 is sent out from the dial signal sending circuit 34 to a 
caller relating to the telephone number Nt.sub.2 under the control of the 
control circuit 35 to give a telephone call to the caller in response to 
the caller's telephone call. The response-transmission operation is 
described ill detail with reference to FIG. 7. 
FIG. 7 is a flow chart of the response-transmission operation performed in 
the telephone terminal equipment 31 shown in FIG. 2. 
As shown in FIG. 7, when the subscriber takes up the handset 20, the hook 
switch 21 is switched on so that the handset 20 is set to the off-hook 
condition. Thereafter, an off-hook signal is transferred from the hook 
switch 21 to the control circuit 35. Therefore, it is judged in the 
control circuit 35 that the handset 20 is set in the off-hook condition (a 
step 110). Thereafter, the interface circuit 22 is controlled by the 
control circuit 35 to connect the telephone lines 13 to the receiving and 
transmitting circuits 23, 24 through the interface circuit 22 (a step 
111). 
Thereafter, in cases where the subscriber intends to give a telephone call 
to a caller according to a normal transmission operation, the subscriber 
necessarily dials a telephone number of the receiver by pushing keypads 
(not shown) on the handset 20 so that a dial signal relating to the 
telephone number is sent out from the dial signal sending circuit 34 to 
the caller under the control of the control circuit 35. 
In contrast, in cases where the subscriber intends to give a telephone call 
to a specific caller in response to the specific caller's telephone call 
according to the response-transmission operation, the subscriber pushes 
down the displaying switch 25 in a step 112. Therefore, all of the 
telephone numbers stored in the memory circuit 18 are displayed on the 
displaying circuit 19. Thereafter, the subscriber identifies a specific 
telephone number of the specific caller to which a no-response mark Mn is 
attached, and the subscriber designates the specific telephone number by 
setting the designation underline Ld to the specific telephone number 
according to the scroll operation. Thereafter, the subscriber pushes down 
the response-transmission switch 33 to transfer a response signal and the 
specific telephone number to the control circuit 35. Therefore, it is 
judged in the control circuit 35 that the response-transmission operation 
is performed in the telephone terminal equipment 31 (a step 113). 
Thereafter, a dial signal relating to the specific telephone number is 
sent out from the dial signal sending circuit 34 to the specific caller 
under the control of the control circuit 35 in a step 114. Thereafter, it 
is judged in the control circuit 35 whether or not the specific caller 
takes up his handset (a step 115). 
In cases where the specific caller takes up his handset after a time, the 
operation proceeds to a step 116 and the subscriber talks with the 
specific caller in the two-way conversation. Thereafter, when the handset 
20 is put back on the hook switch 21 because the conversation is over, an 
on-hook signal is transferred from the hook switch 21 to the control 
circuit 35. Therefore, the no-response mark Mn attached to the specific 
telephone number in the memory circuit 18 is eliminated in a step 117. 
In contrast, in cases where the specific caller does not take up his 
handset even though the subscriber waits for a long time, the handset 20 
is put back on the hook switch 21 without taking with the specific caller. 
In this case, the response-transmission operation is finished without 
eliminating the no-response mark Mn attached to the specific telephone 
number. 
Accordingly, even though the subscriber does not respond to a first 
telephone call given by the specific caller, the subscriber can reliably 
give a second telephone call to the specific caller in response to the 
first telephone call of the specific caller according to the 
response-transmission operation because the no-response mark Mn is 
attached to the specific telephone number displayed on the liquid crystal 
display of the displaying circuit 19. 
Also, the subscriber can easily send a dial signal to the specific caller 
under time control of the control circuit 35 without dialing the specific 
telephone number because the specific telephone number is automatically 
read out from the memory circuit to the control circuit 35. 
In the first embodiment, the no-response marks Mn are attached to the 
telephone numbers relating to the no-response calls to distinguish 
no-response calls from response calls. However, the distinction of those 
calls is not limited to the use of the no-response marks Mn. That is, it 
is preferred that response marks Mr be attached to telephone numbers 
relating to the response calls. 
Also, the display circuit 19 is provided with the liquid crystal display in 
the first embodiment. However, it is preferred that the display circuit 19 
be provided with a printer in which the telephone numbers and the 
no-response marks Mn are printed out. Also, it is preferred that the 
display circuit 19 be provided with a composite voice producer in which a 
composite voice such as a voice "no response" is sounded after a telephone 
number is sounded. 
Next, a second embodiment of the present invention is described. 
FIG. 8 is a block diagram of a telephone terminal equipment according to a 
second embodiment of the present invention. 
As shown in FIG. 8, a telephone terminal equipment 41 at a subscriber's 
side comprises the ring signal detecting circuit 12, time ringing tone 
generating circuit 14, the speaker 15, the telephone number detecting 
circuit 16, the memory circuit 18, the displaying circuit 19, the handset 
20, the hook switch 21, the interface circuit 22, the receiving circuit 
23, the transmitting circuit 24, the displaying switch 25, the ring signal 
termination detecting circuit 32, the response-transmission switch 33, the 
dial signal sending circuit 34, a voice recognition circuit 42 for 
recognizing a voice of a caller transferred through the telephone lines 
13, an elapsed time counting circuit 43 for counting an elapsed time of 
the conversation performed between the caller and the subscriber after the 
voice of the caller is recognized in the voice recognition circuit 42, and 
a control circuit 44 including a microcomputer for receiving various 
signals from the ring signal detecting circuit 12, the telephone number 
detecting circuit 16, the memory circuit 18, the hook switch 21, the 
displaying switch 25, the response-transmission switch 33, the voice 
recognition circuit 42, and the elapsed time counting circuit 43, and 
controlling the ringing tone generating circuit 14, the memory circuit 18, 
the displaying circuit 19, the interface circuit 22, the dial signal 
sending circuit 34, and the elapsed time counting circuit 43. 
In the above configuration, a response-transmission operation is performed 
in the same manner as in the telephone terminal equipment 31 so that only 
a telephone call receiving operation according to the second embodiment of 
the present invention is described. 
FIG. 9 is a flow chart of a telephone call receiving operation performed in 
the telephone terminal equipment 41 shown in FIG. 8 according to the 
second embodiment of the present invention. 
As shown in FIG. 9, the telephone call receiving operation is initially 
performed according to the steps 101 to 106 in the same manner as in the 
telephone terminal equipment 31. Thereafter, when the subscriber starts on 
talking with the caller in the two-way conversation in the step 106, a 
voice of the caller is recognized in the voice recognition circuit 42 in a 
additional step 106A. Also, when the voice of the caller is recognized in 
the voice recognition circuit 42, a voice recognition signal is 
transferred to the control circuit 44, and an elapsed time Tc of the 
two-way conversation is counted in an elapsed time counting circuit 43 
under the control of the control circuit 44 in the step 106A. Thereafter, 
the step 107 is performed in the same manner as in the telephone terminal 
equipment 31. 
When the handset 20 is put back on the hook switch 21 because the 
conversation is over, the operation proceeds to an additional step 107A, 
and it is judged in the control circuit 44 whether or not the elapsed time 
Tc counted in the elapsed time counting circuit 43 is equal to or more 
than a minimum conversation time Tm. In cases where the elapsed time Tc is 
lower than the minimum conversation time Tm, it is judged in the control 
circuit 44 that the response of the subscriber to the telephone call of 
the caller is not successful. Therefore, the operation proceeds to the 
step 109 so that a no-response mark Mn is attached to the telephone number 
of the caller stored in the memory circuit 18 under the control of the 
control circuit 44. In contrast, in cases where the elapsed time Tc is 
equal to or more than the minimum conversation time Tm, it is judged in 
the control circuit 44 that the response of the subscriber to the 
telephone call of the caller is successful. Therefore, the operation 
proceeds to the step 108, and the step 108 is performed in the same manner 
as in the telephone terminal equipment 31. 
Therefore, even though the handset 20 is put back on the hook switch 21 in 
the step 107, the conversation between the subscriber and the caller is 
not necessarily performed meaningfully. For example, there is a case that 
the caller promptly puts back his handset without taking with the 
subscriber after the subscriber takes up the handset 20 in the step 104. 
In this case, the handset 20 is put back on the hook switch 21. In the 
step 107 without taking with the caller. Also, even though the subscriber 
starts on taking with the caller in the step 106, there is another case 
that the conversation is erroneously interrupted. In this case, the 
handset 20 is put back on the hook switch 21 in the step 107 without 
meaningfully performing the conversation. 
Accordingly, because the elapsed time Tc of the conversation performed 
between the caller and the subscriber is counted in cooperation with the 
voice recognition circuit 42 and the elapsed time counting circuit 43, it 
can be judged in the control circuit 44 whether or not the conversation 
between the subscriber and the caller is meaningfully performed. 
In the second embodiment, a voice of the caller is recognized in the voice 
recognition circuit 42. However, the second embodiment is not limited to 
the voice of the caller. That is, it is preferred that a voice of the 
subscriber be recognized in the voice recognition circuit 42 in place of 
the voice of the caller. 
Next, a third embodiment of the present invention is described with 
reference to drawings. 
FIG. 10 is a block diagram of a telephone terminal equipment according to a 
third embodiment of the present invention. 
As shown in FIG. 10, a telephone terminal equipment 51 at a subscriber's 
side comprises the ring signal detecting circuit 12, the ringing tone 
generating circuit 14, the speaker 15, the telephone number detecting 
circuit 16, the memory circuit 18, the displaying circuit 19, the handset 
20, the hook switch 21, the interface circuit 22, the receiving circuit 
23, the transmitting circuit 24, the displaying switch 25, the 
response-transmission switch 33, the dial signal sending circuit 34, an 
absent mode setting switch 52 for switching the telephone terminal 
equipment 51 from the waiting mode to an absent mode, a message 
transmitting-receiving section 53 for automatically transmitting a 
response message of the subscriber and receiving an incoming message of 
the caller in cases where the telephone terminal equipment 51 is set in 
the absent mode, a selector switch 54 for connecting the telephone lines 
13 to the handset 20 in the waiting mode and connecting the telephone 
lines 13 to the message transmitting-receiving section 53 in the absent 
mode, a control circuit 55 including a microcomputer for receiving various 
signals from the ring signal detecting circuit 12, the telephone number 
detecting circuit 16, the memory circuit 18, the hook switch 21, the 
displaying switch 25, the response-transmission switch 33, and the absent 
mode setting switch 52, and controlling the ringing tone generating 
circuit 14, the memory circuit 18, the displaying circuit 19, the 
interface circuit 22, the dial signal sending circuit 34, the message 
transmitting-receiving section 53, and the selector switch 54. 
The message transmitting-receiving section 53 comprises a response message 
sending out circuit 56 for sending out the response message of the 
subscriber recorded in advance in a recording tape, an incoming message 
recording circuit 57 for recording the incoming message of the caller 
which is transferred in the form of aural signals, and an aural signal 
distinguishing circuit 58 for distinguishing the aural signals from 
various signals transferred through the telephone lines 13 to detect the 
end of the incoming message. 
In the above configuration, a telephone call receiving operation in the 
waiting mode is performed in the same manner as in the first embodiment. 
Therefore, a telephone call receiving operation in the absent mode is 
initially described in detail. 
FIG. 11 is a flow chart of a telephone call receiving operation in the 
absent mode performed in the telephone terminal equipment 51 shown in FIG. 
10 according to the third embodiment of the present invention. 
As shown in FIG. 11, when the subscriber leaves his house, the subscriber 
switches on the absent mode setting switch 52 to set the telephone 
terminal equipment 51 in the absent mode (a step 121). Therefore, a mode 
switching signal is transferred from the absent mode setting switch 52 to 
the control circuit 55, and the selector switch 54 is switched under the 
control of the control circuit 55 to connect the telephone lines 13 to the 
message transmitting-receiving section 53 Through the interface circuit 
22. 
Thereafter, when a caller gives a telephone call to the subscriber, ring 
signals are intermittently provided to the telephone terminal equipment 
51, and a piece of telephone number data subsequent to a first ring signal 
among the ring signals is provided to the telephone terminal equipment 51. 
Therefore, each time one of the ring signals is detected in the ring 
signal detecting circuit 12 in a step 122, a ringing tone is generated in 
the ringing tone generating circuit 14 in a step 123. Therefore, the 
ringing tones are intermittently output from the speaker 15. 
Also, when a piece of telephone number data subsequent to the first ring 
signal is detected in the telephone number detecting circuit 16, the 
telephone number data is transferred from the circuit 16 to the control 
circuit 55 to decode the telephone number data to the telephone number. 
Thereafter, the telephone number of the caller is stored in the memory 
circuit 18 in a step 124 with a piece of order information indicating the 
order of incoming calls. Also, the telephone number is displayed on the 
liquid crystal display of the displaying circuit 19 under control of the 
control circuit 55 in the step 124. 
Thereafter, because the subscriber is absent, the ringing tones continue to 
be output from the speaker 15. When the number of ring signals provided to 
the ring signal detecting circuit 12 reaches a predetermined number, the 
interface circuit 22 is controlled by the control circuit 55 to connect 
the telephone lines 13 with the selector switch 54 (a step 125). 
Therefore, the message transmitting-receiving section 53 is connected with 
the telephone lines 13 through the interface circuit 22 and the selector 
switch 54. Thereafter, a response message recorded in the response message 
sending out circuit 56 is automatically sent out to the caller under the 
control of the control circuit 55 in a step 126. 
After all of the response message is sent out from the response message 
sending out circuit 56, the incoming message recording circuit 57 is 
automatically operated to record an incoming message of the caller under 
the control of the control circuit 55 in a step 127. The structure of the 
response message sending out circuit 56 and the incoming message recording 
circuit 57 is the same as that utilized in a conventional telephone 
terminal equipment. Therefore, a detail description of the circuits 56, 57 
is omitted. 
During the recording in the incoming message recording circuit 57, many 
types of signals such as an aural signal, a busy tone signal, and a silent 
tone signal are transferred to the incoming message recording circuit 57. 
Because the incoming message of the caller is transferred in the form of 
aural signals, the aural signals are distinguished from the busy tone 
signals and the silent tone signals in the aural signal distinguishing 
circuit 58. For example, in cases where the strength or phase of signals 
transferred through the telephone lines 13 is irregularly changed, the 
signals are judged as the aural signals in the aural signal distinguishing 
circuit 58. In contrast, in cases where the strength or phase of signals 
transferred through the telephone lines 13 is regularly changed, the 
signals are judged as busy tone signals in the aural signal distinguishing 
circuit 58. Also, in cases where the strength or phase of signals 
transferred through the telephone lines 13 is not changed, the signals are 
judged as silent tone signals in the aural signal distinguishing circuit 
58. Therefore, it is judged in the control circuit 55 whether or not an 
aural signal is distinguished in the aural signal distinguishing circuit 
58 (a step 128). 
In cases where an aural signal is distinguished in the aural signal 
distinguishing circuit 58 after the incoming message recording circuit 57 
is operated, the incoming message of the caller is reliably recorded in 
the incoming message recording circuit 57. Thereafter, a distinguishing 
signal is transferred from the aural signal distinguishing circuit 58 to 
the control circuit 55, and a recording mark Mr is attached to the 
telephone number of the caller stored in the memory circuit 18 under the 
control of the control circuit 55 in a step 129. The recording mark Mr 
indicates that the incoming message of the caller is recorded in the 
incoming message recording circuit 57. 
Thereafter, the operation in the aural signal distinguishing circuit 58 is 
continued, and it is judged in the control circuit 55 whether or not the 
aural signals are continuously distinguished in the aural signal 
distinguishing circuit 58 (a step 130). When the caller finishes giving 
the incoming message of the caller to the subscriber, the caller puts down 
his handset. Therefore, any aural signal is not detected in the aural 
signal distinguishing circuit 58. In this case, a message finishing signal 
is transferred from the aural signal distinguishing circuit 58 to the 
control circuit 55, and the recording of the incoming message in the 
recording circuit 57 is stopped under the control of the control circuit 
55 in a step 131. Also, the interface circuit 22 is controlled by the 
control circuit 55 to disconnect the telephone lines 13 with the selector 
switch 54 (a step 132). 
In contrast, in cases where the caller puts down his handset without giving 
the incoming message of the caller to the subscriber after the incoming 
message recording circuit 57 is operated, any aural signal is not detected 
in the aural signal distinguishing circuit 58 in the step 128. Therefore, 
the operation proceeds to the step 131 without attaching any recording 
mark Mr to the telephone number of the caller stored in the memory circuit 
18. Thereafter, the recording in the incoming message recording circuit 57 
is stopped in the step 131, and the telephone lines 13 is disconnected 
with the selector switch 54 in the step 132. 
Accordingly, in cases where the incoming message of the caller is recorded 
in the incoming message recording circuit 57 in the absent mode, the 
recording mark Mr can be reliably attached to the telephone number of the 
caller stored in the memory circuit 18. In contrast, in cases where the 
caller does not give the incoming message of the caller to the subscriber 
in the absent mode, any recording mark Mr is not attached to the telephone 
number of the caller stored in the memory circuit 18. 
Next, a displaying operation in which telephone numbers stored in the 
memory circuit 18 are displayed is described according to the third 
embodiment. 
When the subscriber returns home, the subscriber switches off the absent 
mode setting switch 52 to set the telephone terminal equipment 51 in the 
waiting mode. Therefore, a mode switching signal is transferred from the 
absent mode setting switch 52 to the control circuit 55, and the selector 
switch 54 is switched under the control of the control circuit 55 to 
connect the telephone lines 13 to the handset 20 through the interface 
circuit 22. 
Thereafter, when the subscriber pushes down the displaying switch 25, 
telephone numbers Nt stored in the memory circuit 18 are displayed on the 
liquid crystal display of the display circuit 19 as shown in FIG. 12. 
Also, recording marks Mr relating to the telephone numbers are displayed. 
Accordingly, in cases where the incoming message of the caller is recorded 
in the incoming message recording circuit 57 in the absent mode, the 
subscriber can visually find out a group of telephone numbers of which the 
callers respectively give an incoming message recorded in the incoming 
message recording circuit 57. 
Next, a response-transmission operation is described according to the third 
embodiment. 
As shown in FIG. 12, one of the telephone numbers Nt is designated by a 
designation underline Ld. The designation underline Ld can be moved to any 
telephone number according to a scroll operation performed by the 
subscriber. Therefore, in cases where the subscriber intends to give a 
telephone call to a caller relating to a telephone number Nt.sub.1 to 
which a recording mark Mr is attached, the designation underline Ld is set 
to the telephone number Nt.sub.1. Thereafter, when the subscriber pushes 
the response-transmission switch 33, the telephone number Nt.sub.1 
designated by the designation underline Ld is read out from the memory 
circuit 18 to the control circuit 55. Thereafter, a dial signal relating 
to the telephone number Nt.sub.1 is sent out from the dial signal sending 
circuit 34 to the caller relating to the telephone number Nt.sub.1 under 
the control of the control circuit 55 to give a telephone call to the 
caller. Also, in cases where the subscriber takes up the handset 20, the 
interface circuit 22 is controlled by the control circuit 55 to connect 
the telephone lines 13 with the handset 20. 
Accordingly, in cases where the subscriber intends to give a telephone call 
to a caller relating to an incoming message recorded in the incoming 
message recording circuit 57, the subscriber can accurately give a 
telephone call to the caller without dialing. 
Also, in cases where the two-way conversation between the subscriber and 
the caller is performed in the same manner as in the step 105 shown in 
FIG. 3, the recording mark Mr attached to the telephone number Nt.sub.1 is 
removed after an on-hook signal is transferred from the hook switch 21 to 
the control circuit 55. 
Accordingly, it is not necessary to manually remove the recording mark Mr 
after the telephone conversation is performed. 
In the third embodiment, the recorded marks Mr are attached to telephone 
numbers relating to recorded telephone calls. However, it is not limited 
to attach the recorded marks Mr. That is, it is preferred that no-recorded 
marks be attached to telephone numbers relating to no recorded telephone 
calls. 
Also, the display circuit 19 is provided with the liquid crystal display in 
the third embodiment. However, it is preferred that the display circuit 19 
be provided with a printer in which the telephone numbers and the recorded 
marks Mr are printed out together. Also, it is preferred that the display 
circuit 19 be provided with a composite voice producer in which a 
composite voice such as a voice "recorded" is sounded after a telephone 
number is sounded. 
Having illustrated and described the principles of our invention in a 
preferred embodiment thereof, it should be readily apparent to those 
skilled in the art that the invention can be modified in arrangement and 
detail without departing from such principles. We claim all modifications 
coming within the spirit and scope of the accompanying claims.