Switch device and system

Details Switch device and system Switch device and system

1997-12-12

2003-10-14

Olms, Douglas (Department: 2732)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C379S225000, C379S229000

Reexamination Certificate

active

06633591

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a private branch exchange (PBX) network system, and more particularly to a private branch exchange network system including a plurality of private branch exchanges connected to an integrated services digital network (ISDN).
2. Description of the Related Art
FIG. 1
is a diagram showing a PBX network having PBXs
10
and
12
connected to an ISDN
14
. The PBXs
10
and
12
are local switch devices. An ISDN tie line
16
connects the PBXs
10
and
12
together. Terminals such as telephone sets are connected to the PBXs
10
and
12
so that a PBX network is formed. For the sake of simplicity, only one telephone set
18
connected to the PBX
10
is illustrated, and only one telephone set
20
connected to the PBX
12
is illustrated. The telephone sets
18
and
20
are respectively connected to extensions of the PBXs
10
and
12
, and will be referred to as extension telephone sets hereinafter.
The PBX
10
sends a message to the PBX
12
over the ISDN tie line
16
, and PBX
12
sends a message to the PBX
10
thereover. For example, the message sent by the PBX
10
includes the identification number of the PBX
10
, and a ID of the calling terminal, that is, the extension telephone set
18
. In
FIG. 1
, the PBXs
10
and
12
are respectively assigned identification numbers “700” and “710”, and the extension telephone sets
18
and
20
are respectively assigned IDs “A” and “B”.
Telephone sets
22
and
24
are connected to the ISDN
14
, and are assigned IDs “X” and “Y”, respectively. The telephone set
22
can call the extension telephone set
20
via the ISDN
14
, the PBX
10
, the ISDN tie line
16
and the PBX
12
. However, in this case, the message sent to the PBX
12
from the PBX
10
includes the identification number “700” of the PBX
10
and the identification number of the ISDN network, but does not include the ID “X” of the calling telephone set
22
. Hence, the called telephone set
20
is not informed of the ID “X” of the calling telephone set
22
. This is inconvenient when the extension telephone set
20
calls the telephone set
22
by return.
The extension telephone set
18
can call the telephone set
24
via the ISDN tie line
16
, the PBX
12
, the ISDN
14
. In this case, the message sent to the PBX
12
from the PBX
10
includes the identification number “700” of the PBX
10
and the ID “A” of the calling telephone set
18
. However, the message sent to the telephone set
24
from the ISDN
14
does not include the ID “A” of the calling telephone set
18
. This is inconvenient when the telephone set
24
calls the extension telephone set
18
connected to the PBX
10
by return.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a switch device and a system in which the above disadvantages are eliminated.
A more specific object of the present invention is to provide a switch device and a system capable of informing a called terminal of information indicative of the identification of the calling terminal, which may be accommodated by a local switch (PBX) or an ISDN, so that the identification information of the calling terminal can be displayed or the called terminal can easily call the calling terminal by return.
These objects of the present invention are achieved by a switch device connectable to an ISDN, the switch device comprising: a first part which adds a calling ID information element to a first call setup message to be transferred over an ISDN tie line connecting the switch device to another switch device, the calling ID information element including identification information on a terminal which is connected to the ISDN and makes a call.
The switch device may further comprise a second part which receives the first call setup message transferred via the ISDN tie line from another switch device and writes the calling ID information element into a second call setup message to be transferred over the ISDN so that the switch device calls the terminal connected to the ISDN.
The switch device may further comprise a third part which allows a first extension terminal connected to the switch device to communicate with the terminal connected to the ISDN upon receiving a call therefrom and then calls a second extension terminal connected to another switch device or another terminal connected to the ISDN via the ISDN tie line.
The above objects of the present invention are also achieved by a switch device connectable to an ISDN, the switch device comprising: a first part which translates an extension number of an extension terminal connected to the switch device into a dial-in number; and a second part which adds the dial-in number to a first call setup message to be transferred over an ISDN tie line connecting the switch device to another switch device.
The switch device may further comprise a third part which receives the first call setup message transferred via the ISDN tie line from another switch device and writes the dial-in number into a second call setup message to be transferred over the ISDN so that the switch device calls the terminal connected to the ISDN.
The switch device may further comprise a fourth part which allows a first extension terminal connected to the switch device to communicate with the terminal connected to the ISDN upon receiving a call therefrom and then calls a second extension terminal connected to another switch device or another terminal connected to the ISDN via the ISDN tie line.
The above objects of the present invention are also achieved a system comprising: a first device and a second device which are connected to an ISDN, the first switch device comprising: a first part which adds a calling ID information element to a first call setup message to be transferred over an ISDN tie line connecting the first and second switch devices together, the calling ID information element including identification information on a terminal which is connected to the ISDN and makes a call.
The system may be configured so that the second switch device comprises a second part which receives the first call setup message transferred from the first switch device via the ISDN tie line and writes the calling ID information element into a second call setup message to be transferred over the ISDN so that the second switch device calls the terminal connected to the ISDN.
The system may be configured so that the first switch device comprises a third part which allows a first extension terminal connected to the first switch device to communicate with the terminal connected to the ISDN upon receiving a call therefrom and then calls a second extension terminal connected to the second switch device or another terminal connected to the ISDN via the ISDN tie line.
The system may be configured so that the first switch device comprises a third part which allows a first extension terminal connected to the first switch device to communicate with the terminal connected to the ISDN upon receiving a call therefrom and then calls a second extension terminal connected to the second switch device or another terminal connected to the ISDN via the ISDN tie line.
The above objects of the present invention are also achieved by a system comprising: a first switch and a second switch connected to an ISDN, the first switch device comprising: a first part which translates an extension number of an extension terminal connected to the first switch into a dial-in number; and a second part which adds the dial-in number to a first call setup message to be transferred to the second switch over an ISDN tie line connecting the first and second switch devices together.
The system may be configured so that the first switch device comprises a third part which receives the first call setup message transferred over the ISDN tie line from the first switch device and writes the dial-in number into a second call setup message to be transferred over the ISDN so that the second switch device calls the terminal connected to the ISDN.
The system may be c

Affiliated with

Also associated with

Rating

Switch device and system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Switch device and system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switch device and system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3175502