Telephonic communications – Plural exchange network or interconnection – Multi-pbx interconnection
Reexamination Certificate
1999-01-28
2002-11-12
Matar, Ahmad F. (Department: 2642)
Telephonic communications
Plural exchange network or interconnection
Multi-pbx interconnection
C379S221080, C379S230000, C379S901000, C379S221150, C379S219000
Reexamination Certificate
active
06480595
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a communication method and, more particularly, to a method for communicating through a leased line in a virtual private network and a leased line.
DESCRIPTION OF THE RELATED ART
VPN (Virtual Private Network) and IN (Intelligent Networks) are kinds of private communication service through a public network. Specified subscribers communicate with one another through the virtual private network or the intelligent networks. Exchangers are incorporated in those networks, and steer pieces of data between the specified subscribers. When a terminal calls another terminal, the exchangers establish a communication path in the virtual private network or the intelligent networks, and pieces of data are transferred through the communication path between the terminals. In the following description, both VPN and IN are simply referred to as “virtual private network”.
On the other hand, a leased line is exclusively used by a specific user, and an exchanger of the public network does not participate the communication between terminals of the specific user. The leased line achieves a high quality communication rather than the circuit switching service, and the communication through the leased line is more economical rather than the communication through the public network.
If the specified subscribers of the virtual private network have the leased line, the public network and the leased lines are theoretically available for the communication. In the following description, if a leased line is provided in parallel to a part of a virtual private network, the communication system is referred to as “composite communication network”. The present inventor searched documents already published for the composite communication network. The present inventor found Japanese Patent Publication of Unexamined Application Nos. 4-291595, 6-205137, 7-183945, 7-221838 and 8-195814. The present inventor checked the Japanese Patent Publication of Unexamined Applications to see how the leased line is used in the composite communication network. However, the leased line is not effectively used.
FIG. 1
illustrates a prior art composite communication network. The virtual private network is owned by a user group
1
, and a code (ggggg) is assigned to the user group
1
. Subscribers
1
a
/
1
b
/
1
c
belong to the user group
1
. The user group has a head office H
1
in a city X and a branch office B
1
in another city Y, and private branch exchangers
2
a
/
2
b
are placed in the head office H
1
and the branch office B
1
, respectively. The subscribers
1
b
and
1
c
are in the head office H
1
and the branch office B
1
, and are connected to the private branch exchangers
2
a
/
2
b,
respectively. The subscriber
1
a
is in yet another city Z. The communication between the head office H
1
and the branch office B
1
is so much that a leased line
3
is connected between the private branch exchangers
2
a
and
2
b.
The virtual private network is established in a public network
4
, and the public network
4
has exchangers
4
a
/
4
b
/
4
c.
The cities X/ Y/ Z are in the service areas of the exchangers
4
a
/
4
b
/
4
c,
respectively. The exchanger
4
c
serves as a service switching point, and is under the control of a service control point SCP.
When the subscriber
1
a
wants to communicate with the subscriber
1
c
through the virtual private network, the subscriber
1
a
requests the exchanger
4
c
to establish a communication path to the subscriber
1
c
in the virtual private network. The exchanger or the service switching point requests the service control point SCP to route the communication path from the subscriber
1
a
to the subscriber
1
c.
The service control point SCP takes the service area of the exchanger
4
b
into account, and routes the communication path
5
as “Exchanger 4c”—“Exchanger 4a”—“Exchanger 4b”—“PBX 2b”—“Subscriber 1c”. Even though the leased line
3
is connected between the private branch exchangers
2
a
and
2
b,
the leased line
3
is not used for the communication between the subscribers
1
a
and
1
c.
As described hereinbefore, the leased line provides a high quality communication, and is more economical rather than the public network. Therefore, the communication through the leased line
3
is desirable. However, the leased line
3
is not always used for the communication.
SUMMARY OF THE INVENTION
It is therefore an important object of the present invention to provide a method for a composite communication network which is a higher in quality and more economical than a virtual private network.
In accordance with one aspect of the present invention, there is provided a method for routing a communication path between a first subscriber and a second subscriber through a public network having service switching points and a service control point and a private network containing entry points and a leased line selectively connected between the entry points, and the method comprises the steps of transferring a first identification number and a second identification number respectively assigned to the first subscriber and second subscriber through at least one of the service switching points to the service control point, determining one of the entry points closest to the first subscriber and a routing number used in the private network, notifying the routing number to the one of the entry points through the public network for routing a communication sub-path passing through the leased line in the private network and establishing the communication path having the communication sub-path between the first subscriber and the second subscriber.
REFERENCES:
patent: 4348554 (1982-09-01), Asmuth
patent: 5339356 (1994-08-01), Ishii
patent: 5455855 (1995-10-01), Hokari
patent: 5490212 (1996-02-01), Lautenschlager
patent: 5539817 (1996-07-01), Wilkes
patent: 5825868 (1998-10-01), Diamond
patent: 5917899 (1999-06-01), Moss et al.
patent: 6055575 (2000-04-01), Paulsen et al.
patent: 6141409 (2000-10-01), Madoch et al.
patent: 6175622 (2001-01-01), Chiniwala et al.
patent: 6285879 (2001-09-01), Lechner et al.
patent: 6377677 (2002-04-01), Ackerly et al.
patent: 4-291595 (1992-10-01), None
patent: 6-205137 (1994-07-01), None
patent: 7-183945 (1995-07-01), None
patent: 7-221838 (1995-08-01), None
patent: 8-149229 (1996-06-01), None
patent: 8-195814 (1996-07-01), None
Bui Bing
Matar Ahmad F.
Sughrue & Mion, PLLC
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