Telephonic communications – Centralized switching system
Reexamination Certificate
1999-08-09
2003-06-10
Tieu, Benny Q. (Department: 2642)
Telephonic communications
Centralized switching system
C379S221120, C370S360000
Reexamination Certificate
active
06577725
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a prefix translation dispersed configuration for an exchange system, and more particularly to a prefix translation dispersed configuration and method for an exchange system having a dispersed number translation processing system.
2. Description of the Conventional Art
In an exchange system, a speed of processing communication between processors considerably affects a system performance. Thus, on a hardware side processors are intended to have a dispersed configuration considering a traffic environment or an economical situation, and on a software side it has been provided programs that simplify a call processing sequence so that unnecessary IPC (Inter Processor Communication) on the sequence is not generated.
FIG. 1
is a schematic diagram illustrating an exchange system according to locations of physical resources.
As shown therein, the exchange system consists of ASSs (Access Switching Subsystems)
10
matching users to trunk lines, an INS (Interconnection Network Subsystem)
20
connecting the ASSs
10
or the ASSs
10
to a CSS
30
and a CCS (Central Control Subsystem)
30
performing general control, application and maintenance of the exchange system.
More particularly, each ASS
10
provided with a user and trunk line matching device, a time switch and various signal devices performs dispersed call process. The ASS
10
systematically having a horizontally dispersed configuration to the INS
20
and forty four ASSs
10
at its maximum can be connected to the INS
20
. The INS
20
performs number translation, that is, prefix and suffix code translation, route control, space switch connection, user information storing and management. Thus, blocks that perform call processing functions, such as number translation, routing and switching functions, are located in the INS
10
. While, the CCS
30
has statistics on maintenance and application of a system, mass storage control/management, and user instruction control.
In such an exchange system, when a call is generated by a user, the ASSs
10
requests information of the user to the INS
20
. The ASSs
10
which receive an originating user information perform a necessary call service function and request number translation to the INS
20
which translates the number and sets a speech path of the incoming outing ASSs through speech path search and connection. ASSs (not shown) on a call receiving side perform incoming call services. When the call is completed, the incoming outing ASSs return call data to idle states and the originating ASSs
10
inform the CSS
10
of charging data.
In addition, a failure state of the ASSs
10
or the INS
20
is informed to the CCS
30
which performs the application and maintenance of the exchange system in accordance with the received information and transmits a corresponding instruction to the ASSs
10
or the INS
20
.
The number translation must be served to all calls going for destinations and a telephone number (hereinafter, called digits) which the user dials is a key to the destination, which means the originating user assigns a specific called subscriber. Accordingly, all the calls are determined whether to be received to a specific line or to be outgone to a station by the number translation.
The number translation which becomes the key to the call connection is divided into prefix translation and suffix translation and those translation performances are generally carried out in the INS
20
. Thus, the exchange system stores number data therein as a table to analyze a prefix, a special service code, a suffix and an area code which can be processed in an intra-office for the number translation, and retrieves prefix and suffix tables with received digits as a key, thereby translating a corresponding number.
FIG. 2
is a block diagram which detaildely illustrates a conventional number translation processing configuration.
As shown therein, the conventional number translation processing configuration is constituted of a call control block
11
, a call shared library block
12
and a trunk control block
13
that are provided in the ASS
10
and a number translation block
21
, a number data processing block
22
and a route control block
23
that are provided in the INS
20
. Thus, the number translation is accomplished by the IPC transmission and receive between the ASS
10
and the INS
20
and a call processing function from a call start and a call cancel is accomplished by a linkage of the call control block
11
of the ASS
10
, the number translation block
21
of the INS
20
, a switching block (not shown) and the route control block
23
.
Specifically, the call control block
11
, in accordance with characteristics of a terminal, has at least twenty blocks including a general voice subscriber call control block, a general ISDN (integrated service digital network) subscriber call control block, a packet subscriber call control block, a V
5
.
2
subscriber call control block, an R
2
call control block, a No
7
trunk call control block, and various special service call control blocks, the call control block
11
performing a required call service and collecting the predetermined number of digits from a subscriber terminal or a trunk, for thereby calling the call shared library
12
. Here, the number of initially required digits which is previously set is generally
3
used for the number translation.
The call shared library block
12
extracts digits and various call informations required for the number translation from a common area in accordance with a library call from the call control block
11
, the extracted digits and informations being outputted to the INS
20
through an IPC link
50
. The trunk control block
13
seizes a trunk for transiting a call to the terminating station in accordance with a trunk seizing signal which is inputted from the route control block
23
through an IPC link
52
.
Further, the number translation block
21
retrieves prefix and suffix tables in a point-to-point manner with digits received from the call shared library block
12
as a key and thus informs the call control block
11
of a corresponding information and a translation result through an IPC link
51
if there is a corresponding prefix or suffix. The number translation block
21
requests the route control block
23
to perform an outgoing routing process when the translation result is proven that a call type is an outgoing.
The number data processing block
22
performs generation, reference, change and cancel of data related to a prefix which is necessary for the number translation in accordance with an instruction of an operator, while the route control block
23
searches a route through which a corresponding call is transited in accordance with the outgoing routing request of the number translation block
21
and then outputs a trunk seizing control signal.
Now, an operation of the conventional number translation processing configuration will be described with the accompanying drawings.
When a call is generated from a user or an originating station, the call control block
11
collects digits, for example, three digits, that are necessary for the prefix translation through a user terminal or trunk. When the digits which are necessary for the prefix translation, the call control block
11
calls a prefix translation request library of the call shared library block
12
and thus extracts the digits and various call informations necessary for the prefix translation and requests the prefix translation to the number translation block
21
.
The number translation block
21
translates the received prefix, that is, searches the prefix table of the number data processing block
22
in the point-to-point manner with the received digits as a key, thereby checking whether there exists a prefix corresponding to the received digits. As a result of the translation, if the corresponding prefix exists, that is, the received digits are a normal prefix, the number translation block
21
obtains information
Fleshner & Kim LLP
LG Information & Communications Ltd.
Tieu Benny Q.
LandOfFree
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