Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-03-31
2001-05-29
Kizou, Hassan (Department: 2662)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C379S283000
Reexamination Certificate
active
06240093
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention generally relates to telecommunication systems and more particularly to a transfer of push-button signals from a terminal to a service system via an exchange.
Conventionally, it is practiced to provide various services such as reservation of air tickets, collection of questionnaires, and the like, by transferring push-button signals created by a push-button telephone set or a personal computer having an equivalent function to an appropriate service system.
FIG. 1
shows the construction of a conventional transfer system of push-button signals.
Referring to
FIG. 1
, an exchange
10
carries out a switching of a network (NW)
11
and accommodates therein a line to an end user terminal
12
, which may be a push-button telephone or a personal computer having an equivalent function. The exchange
10
further includes a push-button signal receiver (PBR)
14
for detecting push-button signals supplied from the end user terminal
12
to the exchange
10
, wherein the push-button signal receiver
14
further converts the detected push-button signals to a corresponding code. As a result of the foregoing conversion, the address (telephone number) of the destination terminal is recognized when a call is issued by the end user terminal
12
.
Further, it should be noted that the network
11
is connected to a service system (SS)
16
that provides various services such as reservation of air tickets or collection of questionnaires. The network
11
may use a common-line transmission process in which various monitoring and control signals are transmitted through a common signal line
18
. For the transmission of an audio signal, an audio-channel
20
is provided. It should be noted that the exchange
10
and the service system
16
are connected to the audio-channel
20
via trunks (TRK)
21
and
22
. Further, the service system
16
also includes a push-button signal receiver (PBR)
24
.
In operation, a push-button signal issued by the user at the terminal
12
during a state in which there is a circuit connection between the end user terminal
12
and the service system
16
, is transferred to the service system
16
from the exchange
10
to the audio-channel
20
, wherein the push-button signal receiver
24
of the service system
16
detects the push-button signal and converts the same into a corresponding code.
In such a conventional system, in which the exchange
10
accommodates therein the line to the end user terminal
12
, it is essential that the exchange
10
has the push-button signal receiver
14
for detecting the destination address supplied from the end user terminal
12
at the time of setting up a call in the form of push-button signals and for converting the push-button signals to a corresponding code. On the other hand, the conventional system of
FIG. 1
, in which the push-button signals are transmitted through the audio-channel
20
, has required the service system
16
to have the push-button signal receiver
24
also in addition to the push-button signal receiver
14
, for detecting the push-button signals transmitted through the audio-channel
20
and for converting the same to a corresponding code. Thereby, there has been a problem in the conventional system of
FIG. 1
that the cost of investment is excessive.
Further, in the conventional system of
FIG. 1
, there has been a problem in that the push-button signal, supplied by the end user at the terminal
12
and transmitted through the audio-channel
20
, may experience attenuation as it is propagated through the audio-channel
20
for a long distance. Thereby, there is a substantial risk hat the transmittance of the push-button signals is impaired and the chance of erroneous reception at the service system
16
is increased.
SUMMARY OF THE INVENTION
Accordingly, it is a general object of the present invention to provide a novel and useful transfer method of push-button signals wherein the foregoing problems are eliminated.
Another and more specific object of the present invention is to provide a transfer method of push-button signals to a service system, wherein the need of providing a push-button signal receiver in the service system is eliminated and wherein the risk of erroneous reception of the push-button signals is reduced substantially.
Another object of the present invention is to provide a transfer method of a push-button signal in an exchange connected to a network, said exchange accommodating therein a line to a terminal, said exchange including a push-button signal receiver for detecting a push-button signal created by said end terminal and for converting said push-button signal to a corresponding code, said method comprising the steps of:
detecting a push-button signal created by said terminal, during a state in which said exchange connects said terminal to a remote service system via said network, by using said push-button signal receiver;
encoding said push-button signal detected by said push-button signal receiver to a produce a push-button transfer signal corresponding to said push-button signal by using said push-button signal receiver; and
transmitting said push-button transfer signal to said service system from said exchange to said service system via a signal line of said network.
According to the present invention, it is no longer necessary to provide additional push-button signal receiver in the remote service system and the cost of the service system is reduced, without increasing the cost of the exchange. As the push-button signals are transmitted from the exchange to the remote service system through the signal line of the network, not through the audio-channel, in the form of encoded push-button transfer signals, the problem of signal decay of the transmitted push-button transfer signal is eliminated and a reliable transfer is achieved for the information of the original push-button signals. It should be noted that the push-button signal receiver of the exchange is the same push-button signal receiver used for setting up a circuit between the terminal and the service system.
Other objects and further features of the present invention will become apparent from the following detailed description when read in conjunction with the attached drawings.
REFERENCES:
patent: 4088838 (1978-05-01), Nakata et al.
patent: 4431872 (1984-02-01), Edwards et al.
patent: 4518827 (1985-05-01), Sagara
patent: 5214689 (1993-05-01), O'Sullivan
patent: 59-27660 (1984-02-01), None
patent: 63-290054 (1988-11-01), None
patent: 01284197 (1989-11-01), None
patent: 03082259 (1991-04-01), None
patent: 3-85892 (1991-04-01), None
patent: 3-23556 (1991-10-01), None
patent: 07283869 (1995-10-01), None
Elallam Ahmed
Fujitsu Limited
Helfgott & Karas P.C.
Kizou Hassan
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