Node equipment, terminal equipment, and storage medium which...

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing

Reexamination Certificate

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Details

C379S221010

Reexamination Certificate

active

06754328

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a node equipment which provides a predetermined communication interface at a relay point or an end of a communication network, a terminal equipment accommodated in the node equipment via any communication link, and a storage medium which stores a program for realizing the equipments.
2. Description of the Related Art
In recent years, a variety of communication systems and data terminals are being put into practice by combining advanced digital transmission technology and advanced information processing technology.
Of such communication systems, particularly, LAN and the internet are applied to not only transferring E-mails and files but also speech communication and pictorial communication, and are also being realized connecting with existing telephone networks and other communications, along with price reduction in hardware and multimedia data terminals improved in throughputs.
FIG. 12
is a diagram showing an example of a construction of a communication system made of a plurality of PBXs connected to a public telephone network and the internet.
In the example shown in
FIG. 12
, PBXs
100
-
1
and
100
-
2
are connected to a public telephone network
101
and the internet
102
. Interior wires
103
-
11
to
103
-
1
M of the PBX
100
-
1
and interior wires
103
-
21
to
103
-
2
M of the PBX
100
-
2
are respectively connected to terminals
104
-
11
to
104
-
1
M and
104
-
21
to
104
-
2
M. The PBXs
100
-
1
and
100
-
2
are respectively connected to LANs
105
-land
105
-
2
, and the LANs
105
-
1
and
105
-
2
are respectively connected to data terminals (PCs), such as personal computers and others
106
-
11
to
106
-
1
N and
106
-
21
to
106
-
2
N.
The PBX
100
-
1
is made of extension trunks (LCs)
1071
-
1
to
107
-
1
M individually connected to the interior wires
103
-
11
to
103
-
1
M, a line wire trunk (BWT)
108
-
1
connected to the public telephone network
101
, a VoIP gateway
109
-
1
connected to the internet
102
, a switch
110
-
1
having ports respectively connected to the extension trunks
107
-
11
to
107
-
1
M, the line wire trunk
108
-
1
and to the VoIP gateway
109
-
1
, and a processor
112
-
1
connected to a communication link
111
-
1
together with the extension trunks
107
-
11
to
107
-
1
M, the line wire trunk
108
-
1
, the VoIP gateway
109
-
1
and the switch
110
-
1
.
The VoIP gateway
109
-
1
is made of a line interfacing part
113
-
1
connected to a port corresponding to the switch
110
-
1
, the communication link
111
-
1
and the internet
102
, a LAN interface part
114
-
1
connected to the LAN
105
-
1
, a loop back part
115
-
1
, a sub-address recognition part
116
-
1
, a PAD
117
-
1
and a conversion table
118
-
1
connected to an input corresponding to the sub-address recognition part
116
-
1
cascaded between the line interfacing part
113
-
1
and the LAN interface part
114
-
1
, and a processor
120
-
1
connected to a bus
119
-
1
together with the line interfacing part
113
-
1
, the LAN interface part
114
-
1
, the sub-address recognition part
116
-
1
and the PAD
117
-
1
.
Since the construction of the PBX
100
-
2
is identical to that of the PBX
100
-
1
, the description thereof is omitted herein. In the following, identical reference numerals added “2” as a first suffix number are used to denote the corresponding components of the PBX
100
-
2
.
In the conventional example of the above-described construction, the data terminal
106
-
11
is accommodated in the PBX
100
-
1
as an extension terminal via the LAN
105
-
1
and the VoIP gateway
109
-
1
, and has a unique extension number assigned in advance as office data for the PBX
100
-
1
. In the following, it is assumed that the extension number assigned to the data terminal
106
-
11
is “1300” for simplicity.
Moreover, in the PBX
100
-
1
, a line number to be used for identifying an incoming line or an outgoing line which corresponds to the LAN
105
-
1
or the internet
102
is assigned to a port (hereinafter referred as the “first particular port”) connected to the VoIP gateway
109
-
1
in advance among the ports of the switch
110
-
1
. The line number is held as the above-described office data, and is assumed to be “111” for simplicity.
In addition, in the PBX
100
-
2
, an extension number “2100” is assigned to the terminal
104
-
21
; a line number “222” for identifying an incoming line or an outgoing line which corresponds to the LAN
105
-
2
or the internet
102
, is assigned to a port (hereinafter referred to as the “second particular port”) connected to the VoIP gateway
109
-
2
in advance among the ports of the switch
110
-
2
. The extension numbers and line number are held as office data.
Moreover, a unique number “4000” (hereinafter referred as the “GW number”) indicating the entire node equipment
106
-
11
to
106
-
1
N connected to the LAN
105
-
1
is assigned to the VoIP gateway
109
-
1
in advance, and the number is managed by the processors
112
-
1
and
120
-
1
.
Unique IP addresses individually assigned to the terminals
104
-
11
to
104
-
1
M (the interior wires
103
-
11
to
103
-
1
M) are stored in advance in the conversion table
118
-
1
for records which correspond to the corresponding extension numbers.
Such IP addresses are assigned in a various form adapted to each access point of the internet
102
, but it is not a feature of the present invention, the description thereof is omitted herein.
Similarly, a unique GW number “4100” indicating an equipment connected to the LAN
105
-
2
is assigned to the VoIP gateway
109
-
2
in advance.
Unique IP addresses individually assigned to the terminals
104
-
21
to
104
-
2
M (the interior wires
103
-
21
to
103
-
2
M) are stored in advance in the conversion table
118
-
2
for records that correspond to the corresponding extension numbers.
The data terminal
106
-
11
is provided with hardware and software operating as an internet telephone.
Moreover, when, for example, a call to the terminal
104
-
21
accommodated in the interior wire
103
-
21
of the PBX
100
-
2
is originated at the data terminal
106
-
11
, an operator sets a phone number made of a sequence of the above-described GW number “4000”, the line number “222” and the extension number “2100”.
The data terminal
106
-
11
transmits a message, which contains the phone number and indicates an origination request, to the VoIP gateway
109
-
1
via the LAN
105
-
1
in the form of a packet.
In the VoIP gateway
109
-
1
, the PAD
117
-
1
disassembles the packet given via the LAN interface part
114
-
1
, and transfers the information contained in the packet to the processor
120
-
1
via the bus
119
-
1
.
The processor
120
-
1
compares the GW number “4000” given in this manner and the GW number (=4000) given in advance. When the processor
120
-
1
determines that both numbers are equal to each other, the processor
120
-
1
selects the internet
102
as an outgoing line for the corresponding call from the internet
102
and a route formed between the processor
120
-
1
and the port corresponding to the switch
110
-
1
.
In addition, the processor
120
-
1
generates a predetermined form of IP packet containing the GW number “4000”, the route number “222” and the extension number “2100”, are contained in the above-described phone number, and performs origination by transmitting the IP packet to the internet
102
via the bus
119
-
1
and the line interfacing part
113
-
1
on the basis of a predetermined protocol.
On the other hand, in the VoIP gateway
109
-
2
provided in the PBX
100
-
2
, a line interfacing part
113
-
2
transfers the IP packet given via the internet
102
and contains the GW number “4000”, the line number “222” and the extension number “2100” to the loop back part
115
-
2
.
The loop back part
115
-
2
determines whether the destination of the IP packet is in the local station, and when the result is true, the loop back part
115
-
2
transfers the IP packet to th

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