[go: up one dir, main page]

WO2001026346A1 - Serveur d'acces et procede de detection d'appel pour le serveur - Google Patents

Serveur d'acces et procede de detection d'appel pour le serveur Download PDF

Info

Publication number
WO2001026346A1
WO2001026346A1 PCT/JP1999/005396 JP9905396W WO0126346A1 WO 2001026346 A1 WO2001026346 A1 WO 2001026346A1 JP 9905396 W JP9905396 W JP 9905396W WO 0126346 A1 WO0126346 A1 WO 0126346A1
Authority
WO
WIPO (PCT)
Prior art keywords
access
line
digital data
data communication
information element
Prior art date
Application number
PCT/JP1999/005396
Other languages
English (en)
Japanese (ja)
Inventor
Akira Nakanishi
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP1999/005396 priority Critical patent/WO2001026346A1/fr
Publication of WO2001026346A1 publication Critical patent/WO2001026346A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/20—Aspects of automatic or semi-automatic exchanges related to features of supplementary services
    • H04M2203/2066—Call type detection of indication, e.g. voice or fax, mobile of fixed, PSTN or IP

Definitions

  • the present invention relates to an access receiving apparatus and an incoming call identification method in the apparatus.
  • an access accepting device that accepts access from multiple different types of lines via ISDN (Integrated Services Digital Network), and at least an ISDN access or special Access from a digital data communication line, and an incoming call from which access from the special digital data communication line can be determined. It relates to the identification method.
  • ISDN Integrated Services Digital Network
  • a remote LAN Local Area Network
  • a PC Personal Computer
  • the device that carries out this accommodation is the access reception device.
  • a representative example of this access device is an access server.
  • the number of users using the LAN Internet network has increased dramatically, and the number of users using the above-mentioned access server, such as the above-mentioned access server, which is the device that accommodates the users, is increasing.
  • the conventional access receiving device converts accesses from a number of various lines into a primary rate interface (PRI) of a primary rate interface (PRI). ) By collecting and accepting data on a line, efficient access was accommodated.
  • This PRI line allows 23 or 24 communications to be performed simultaneously on a single line.
  • various types of access from ISDN, analog telephone networks, digital mobile telephone networks and PHS (Personal Handyphone System) networks through network interconnection can be achieved.
  • the access accepting device enables the centralized acceptance.
  • the access accepting device looks at the “communication capability” information element included in the “call setting” message for notifying the arrival of each access, and determines the type of access from which line. Can be identified. The access accepting device that has performed this identification further performs call processing corresponding to the type of the identified line.
  • data communication suitable for each line can be performed.
  • the "destination number" used by the user to access the access receiving device can be unified to one.
  • the convenience of is improved.
  • the access accepting device must perform new call processing corresponding to the new line type. Therefore, it is necessary to identify what type of line the new line is.
  • the access requesting the new digital data communication is made from any line.
  • the new digital data communication service mentioned above is the PHS 64kbps digital data communication service. It has already been decided that this service will be implemented in the near future.
  • the access accepting device determines whether the incoming call is based on the 64 kbps data communication service when the call is received, even if the “transmission capability” information element is viewed. Or access from ISDN cannot be distinguished.
  • the PHS 32 kbps digital data communication service is already in operation, and the access receiving device can identify it using the “transmission capability” information element (described later).
  • the first and second problems are not only the PHS 64 kbps digital data communication service mentioned above as an example, but also other new digital data communication services expected in the future, such as digital mobile communication services. The same applies to digital data communication from a telephone network.
  • the present invention makes use of the existing "transmission capability" information element contained in the current "call setup” message, and thus uses the dedicated line or dedicated called number described above. It is another object of the present invention to provide an access receiving device and an incoming call identification method that can identify the type of line used for new digital data communication.
  • the present invention provides the following access accepting device to achieve the object.
  • this is a line storage unit that accommodates multiple types of lines related to the existing communication accessed and the new digital data communication, and receives the output from this line accommodation unit to
  • a call processing unit that analyzes a "call setting" message relating to access and identifies the type of each line, performs signal processing suitable for the signal of each identified line, and routes to each destination
  • An access receiving apparatus comprising an output processing unit for performing the above operation, wherein the call processing unit includes one or a predetermined number of various information elements included in a “call setting” message.
  • the call processing unit includes one or a predetermined number of various information elements included in a “call setting” message.
  • FIG. 1 is a diagram showing an example of the configuration of a general switching network to which the access receiving device of the present invention is applied.
  • FIG. 2 is a basic configuration diagram of the access reception device according to the present invention.
  • FIG. 3 is a table showing various information elements in a “call setup” message.
  • FIG. 4 is a flowchart showing a method according to the present invention.
  • FIG. 5 is a diagram showing the basic configuration shown in FIG. 2 in more detail
  • FIG. 6 is a diagram showing various information elements included in the “call setup” message
  • FIG. 7 is a method according to the present invention.
  • Fig. 8 shows the details of the "protocol identifier" information element in Fig. 6,
  • Fig. 9 is a diagram showing the details of the "call number” information element in Fig. 6,
  • Fig. 10 is a diagram showing the details of the "message type” information element in Fig. 6,
  • FIG. 11 shows the details of the "communication capability” information element in Fig. 6
  • Fig. 12 shows the details of the "lower layer compatibility” information element in Fig. 6,
  • Fig. 13 is a diagram showing the details of the "calling number” information element in Fig. 6
  • Fig. 14 is a diagram showing the details of the "calling number” information element in Fig. 6
  • FIG. 1 is a diagram showing a configuration example of a general switching network to which an access receiving device of the present invention is applied.
  • reference numeral 10 denotes a switching connection network, in which an access receiving apparatus to which the present invention is applied is indicated by reference numeral 7.
  • Reference number 1 is a user device such as a LAN or PC.
  • the first user device 1 (actually there are many, but only one is represented, the same applies hereinafter) connects to ISDN 5 via the analog telephone network 2.
  • the second user equipment 1 connects to the ISDN 5 via the digital cellular network 3.
  • the third user equipment 1 connects to the ISDN 5 via the PHS network 4.
  • the fourth user device 1 connects directly to the ISDN 5.
  • the I SDN 5 is connected to the access receiving device 7 via the integrated line 6.
  • the access reception device 7 Upon receiving each access from the remote user equipment (1) group, the access reception device 7 performs signal processing suitable for the line type, and then performs a destination corporate LAN 8 or Internet connection. Route the communication information related to the access to step 9.
  • the above-mentioned integrated circuit 6 is generally the PRI circuit described above.
  • the access receiving device 7 that leads to this is generally an access server. Therefore, hereinafter, the integrated line 6 may be referred to as a PRI line, and the access reception device 7 may be referred to as an access server.
  • Fig. 1 shows an example of a network configuration that provides existing communications.
  • Fig. 1 shows an example of a network configuration that provides existing communications.
  • new digital data communications will have to be provided on the network.
  • the access receiving device 7 has to perform a new call process corresponding to the new line type, and therefore, the new line must be a line of any type. It is necessary to identify the presence. However, as already mentioned, it is included in the "call setup" message.
  • PHS's 64 kbps digital data communication service as a new digital data communication service mentioned above has been strongly determined to be implemented in the near future, but this PHS 64 kbps digital data communication will be implemented. Then, when the call is received, the access accepting device 7 sees the above “transmission capability” information element, and the incoming call is an access based on the 64 kbps data communication service, and the access from the ISDN. I can't even tell what it is.
  • FIG. 2 is a basic configuration diagram of the access receiving apparatus according to the present invention.
  • an access reception device (hereinafter also referred to as an access server) 7 includes a line accommodating unit 11, a call processing unit 12, and an output processing unit 13, and the call processing unit 12
  • the identification means 14 is included therein.
  • the line accommodating section 11 accommodates a plurality of types of lines related to the existing accessed communication and the new digital data communication.
  • the call processing unit 12 receives the output from the line accommodation unit 11 and It analyzes the “call setup” message related to the service and identifies the type of each line.
  • the output processing unit 13 executes signal processing adapted to the signal of each identified line, and performs routing to each destination.
  • the specifying means 14 in the call processing unit 12 which characterizes the present invention includes one or a plurality of predetermined pieces of predetermined information among various information elements included in the above-mentioned “call setting” message. By monitoring the information of the elements, a function is provided that indirectly specifies what kind of line the new digital data communication is accessed from.
  • Figure 3 is a table showing various information elements in the “call setup” message.
  • the left column, ISDN, analog telephone network, etc. represent various items of the calling side service, while the upper column, the information elements in the “call setup” message, that is, called side identification information Is shown.
  • Items 1> to ⁇ 5> in this table have already been standardized as standards, but items 6> and ⁇ 7> are undecided.
  • unrestricted digital information means information that does not impose restrictions on the contents of data transmitted from the caller.
  • ISDN 1>, communication 5>, communication 6> The line type cannot be distinguished between communication and communication ⁇ 7>, and the access server 7 cannot restore the data overnight.
  • the access server 7 of the present invention is an access from any type of line for the digital data communication ( ⁇ 1>, ⁇ 5>, ⁇ 6>, ⁇ 7>, etc.) by the specifying means 14. Is indirectly identified by monitoring the information of one or more predetermined information elements among various information elements included in the incoming “call setup” message that makes access It shall be.
  • FIG. 4 is a flow chart showing the method according to the present invention. This flowchart shows the operation executed by the call processing unit 12 in FIG. In particular, steps S5, S6, S7, S8 and S9 are specific steps. This is the step made possible by step 14.
  • the access server 7 receives the access relating to the 64 kbps digital data communication of the PHS.
  • the access is identified as having a line type of 5> in step S7 in FIG.
  • the process leading to this is as follows.
  • Step S1 The access server 7 monitors “information transfer capability” in the “communication capability” information element from the input message. According to the table in Fig. 3, since the communication is ⁇ 5>, the monitoring result is "unrestricted digital information", and the process proceeds to the next step.
  • Step S3 The access server 7 further monitors "user speed" in the "communication capability” information element. According to the table in FIG. 3, since the communication is 5>, there is no regulation on the user speed, and the process proceeds to the next stop.
  • Step S5 The access server 7, especially the identification means 14, monitors the "calling number” information element in the table of FIG. 3 from the input message, and the number digit starts with "070". And recognize. Then move on to the next step.
  • Step S7 The line type related to the incoming access is specified here. That is, it is determined that the incoming call is related to the PHS 64 kbps digital data communication service.
  • the access server 7 monitors a predetermined “transmission capability” information element and a first “calling number” as predetermined information elements, and It is determined that the digital data communication has been accessed from the line related to the PHS 64kbps digital data communication. In this case, the first “calling number” is “070”.
  • step S3 access Since the server ⁇ ⁇ ⁇ recognizes from the table in FIG. 3 that the user speed is 32 kbps, the process proceeds to step S4, and it is determined that the call is related to data communication 4>.
  • step S1 the access server 7
  • the table in Fig. 3 recognizes that the information transfer capability is "3.4 kHz audio", so the process proceeds to step S2, where analog telephone network 2 or digital cellular telephone network 3 is connected. It is determined that the incoming call is for incoming communication 2> or ⁇ 3>.
  • the access server 7, especially the identifying means 14, is in the table of FIG. Since it is recognized that the incoming call starts from, the process proceeds to step S6, and it is determined that the incoming call is related to communication ⁇ 1> through only ISDN.
  • the access relating to the digital data communication of the digital cellular phone has arrived at the access server 7.
  • the access is identified as having the line type of ⁇ 6> in step S8.
  • the process leading to this is as follows.
  • Step S1 The access server 7 monitors “information transfer capability” in the “transmission capability” information element from the input data. According to the table in Fig. 3, since the communication is 6>, the monitoring result is "unrestricted digital information", and the process proceeds to the next step.
  • Step S2 The access server 7 further monitors "user speed" in the "communication capability” information element. According to the table in FIG. 3, since the communication is ⁇ 6>, there is no rule on the user speed, and the process proceeds to the next step.
  • Step S5 The access server 7, particularly the identification means 14, monitors the "calling number” information element in the table of FIG. 3 from the input message, and the number digit starts with "090". And recognize. Then move on to the next step.
  • Step S8 Here, the line type related to the incoming access is specified. That is, it is determined that the incoming call is related to the digital data communication service of the digital mobile phone.
  • the access server 7 monitors a predetermined “transmission capability” information element and a second “calling number” as predetermined information elements, and It is determined that the digital data communication is accessed from the line related to the digital data communication of the digital mobile phone.
  • the second “calling number” is “090”.
  • a third embodiment is disclosed. The third embodiment will be described later. I do. Note that, in the third mode, the “lower layer compatibility” information element already defined in the “call setup” message is used as a predetermined information element, and the “lower layer compatibility” information element is included in the “lower layer compatibility” information element. Based on the indicated information, it is intended to detect what type of line the digital data communication is accessed from.
  • FIG. 5 is a diagram showing the basic configuration shown in FIG. 2 in more detail. Particularly, the output processing unit 13 and the specifying unit 14 shown in FIG. 2 are shown in detail. The steps S11, S12 and S13 in FIG. 4 will also be described with reference to FIG.
  • the PRI line 6 the line accommodating unit 11, the call processing unit 12, the output processing unit 13, and the specifying unit 14 are as already described in FIG. Focusing on the identification means 14 among them, it comprises first, second and third judgment function parts 21, 22 and 23.
  • the first determination function unit 21 monitors a predetermined “transmission capability” information element in FIG. 3 and a first “calling number” as predetermined information elements, and the digital data communication is performed by the PHS It performs the function of determining that the access is from the line related to the 64 kbps digital data communication.
  • the second determination function unit 22 monitors a predetermined “transmission capability” information element and a second “calling number” in FIG. 3 as predetermined information elements, and the digital data communication It performs the function of determining that the access is from a digital data communication line of a digital mobile phone.
  • the third determination function unit 23 uses the “lower layer compatibility” information element (described later) already defined in the “call setup” message in FIG. 3 as a predetermined information element, and Based on the information shown in the “Lower layer compatibility” information element, it performs the function of determining what type of line this digital data communication is accessed from.
  • the processing data from the call processing unit 12 is first input to a channel separation Z multiplexing circuit (UX / DUX) 31 where separation processing (DMUX) is performed in the signal reception direction and multiplex processing (MUX) is performed in the signal transmission direction. Is performed respectively.
  • DMUX separation processing
  • MUX multiplex processing
  • the separated data is distributed to any of the corresponding circuits 32, 33, 34 and 35.
  • the 64 kbps digital data processing circuit 32 converts the signal separated from the channel on the line into a signal format suitable for processing in the subsequent-stage routing processing circuit 36, and converts the signal output from the routing processing circuit 36. , Convert to signal format when multiplexing to channel on line
  • the modem 33 performs modulation / demodulation processing on the signal ( ⁇ 2> or ⁇ 3> in FIG. 3) of the line type identified in step S2 in FIG. This processing corresponds to step S11 in FIG.
  • the PIAFS protocol processing circuit 34 processes the signal ( ⁇ 4> or ⁇ 5> in FIG. 3) of the line type identified in step S7 in FIG. 4 according to a predetermined protocol. I do.
  • This protocol is the PIAFS protocol.
  • PIAFS stands for PHS Internet Access Forum Standard.
  • the processing according to the PIAFS protocol corresponds to step S12 in FIG.
  • the speed matching processing circuit 35 together with the PIAFS protocol processing circuit 34, processes the signal of the line type identified in step S4 in FIG. 4 (4 in FIG. 3).
  • PHS 32 kbps data communication communication is performed at half the bit rate while the channel originally has a 64 kbps bit rate. Therefore, it is necessary to extract a 32 kbps bit group from the 64 kbps bit string. This is performed by the speed matching processing circuit 35.
  • the processing described here corresponds to step S13 in FIG.
  • the signals subjected to the data processing suitable for each line type by the circuits 32 to 35 are input to the routing processing circuit 36, where the destinations are again assigned to the respective signals, and the output ports are output.
  • the routing processing circuit 36 where the destinations are again assigned to the respective signals, and the output ports are output.
  • the access reception device 7 shown in FIG. 2 is not limited to such an access server, but can be implemented by a general-purpose server or a router. They can also be configured.
  • the PRI line (6) is powerfully accommodated by the above-mentioned access reception device 7, and instead of this PRI line, various types of access are aggregated and received by the basic interface (BRI) line. You may make it fit.
  • the access server 7 in FIG. 5 uses the various types of information elements included in the “call setting” message for each access. refer. These information elements are shown schematically in Figure 3, and are described in more detail below.
  • FIG. 6 is a diagram showing various information elements included in the “call setting” message.
  • the “call setup” message is composed of various information elements, that is, “protocol identifier”, “call number”, “message type”, “transmission capability”, “calling number”, These are the information elements of “Destination number” and “Lower layer compatibility”.
  • the “lower layer compatibility” information element is used in the third aspect of the present invention described above, and the “user” which forms one of the fields in this information element is used.
  • the information layer 1 protocol a new type of digital data communication described above can be newly defined.
  • the access server 7, especially the identification means 14, monitors this definition and determines the line type. This corresponds to steps S9 and S10 in FIG. Except for steps S9 and S10, it is exactly the same as FIG.
  • Fig. 8 is a diagram showing the details of the "protocol identifier" information element in Fig. 6.
  • the "TTC standard JT” is a Japanese standard obtained by modifying the ITU-T international standard to Japanese specifications.
  • FIG. 9 is a diagram showing the details of the “call number” information element in FIG. 6.
  • the information elements shown in the figure include some information elements that are important for the present invention.
  • FIG. 12 is a diagram showing details of the “lower layer compatibility” information element in FIG.
  • Octet 5a "User information layer 1 protocol" shown in this figure is used in the third mode. It defines and uses new values to represent new services.
  • FIG. 13 is a diagram showing the details of the “calling number” information element in FIG. 6.
  • the information element shown in this drawing includes an element important for the present invention.
  • IA5 is a character code defined in ITU-T recommendation T.50, consisting of alphabets, numbers, symbols, and controls. Characters are encoded in 7 bits.
  • FIG. 14 is a diagram showing details of the “destination number” information element in FIG. However, this information element is not particularly important in the present invention.
  • the present invention not only the 64 kbps digital data communication of the PHS but also the new digital data communication that is expected to be introduced in the future will not use a dedicated line or a dedicated destination number.
  • the access reception device it becomes possible to automatically identify those line types.
  • the line relating to the above-described new digital data communication can be accommodated without impairing the user's convenience.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)

Abstract

L'inv, sans introduction de ligne spécialisée ou de numéro d'appel spécialisé. Ledit serveur comprend une unité de réception de lignes (11) recevant plusieurs types de lignes, une unité de traitement d'appel (12) qui analyse le message « d'établissement d'appel » associé à un accès et qui identifie le type de la ligne, et une unité de sortie (13) qui exécute un traitement de signal adapté au signal de la ligne et achemine le message jusqu'au destinataire. L'unité de traitement d'appel (12) comporte un moyen de spécification (14) qui contrôle les informations contenues dans un ou plusieurs éléments d'informations prédéterminés parmi les divers éléments d'informations inclus dans le message « d'établissement d'appel », et identifie indirectement le type de la ligne de communication de données numériques établie récemment, par laquelle l'accès est possible.
PCT/JP1999/005396 1999-09-30 1999-09-30 Serveur d'acces et procede de detection d'appel pour le serveur WO2001026346A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/005396 WO2001026346A1 (fr) 1999-09-30 1999-09-30 Serveur d'acces et procede de detection d'appel pour le serveur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/005396 WO2001026346A1 (fr) 1999-09-30 1999-09-30 Serveur d'acces et procede de detection d'appel pour le serveur

Publications (1)

Publication Number Publication Date
WO2001026346A1 true WO2001026346A1 (fr) 2001-04-12

Family

ID=14236885

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/005396 WO2001026346A1 (fr) 1999-09-30 1999-09-30 Serveur d'acces et procede de detection d'appel pour le serveur

Country Status (1)

Country Link
WO (1) WO2001026346A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012084976A (ja) * 2010-10-07 2012-04-26 Nippon Telegr & Teleph Corp <Ntt> 転送サービスシステム、セッション制御サーバ、および転送サービス制御方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03148995A (ja) * 1989-11-02 1991-06-25 Matsushita Electric Ind Co Ltd 構内交換機
JPH11136396A (ja) * 1997-10-31 1999-05-21 Canon Inc 通信装置
JPH11205454A (ja) * 1998-01-20 1999-07-30 Fujitsu Ltd インタネット電話発信者番号通知装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03148995A (ja) * 1989-11-02 1991-06-25 Matsushita Electric Ind Co Ltd 構内交換機
JPH11136396A (ja) * 1997-10-31 1999-05-21 Canon Inc 通信装置
JPH11205454A (ja) * 1998-01-20 1999-07-30 Fujitsu Ltd インタネット電話発信者番号通知装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012084976A (ja) * 2010-10-07 2012-04-26 Nippon Telegr & Teleph Corp <Ntt> 転送サービスシステム、セッション制御サーバ、および転送サービス制御方法

Similar Documents

Publication Publication Date Title
US7738449B2 (en) Method and apparatus for providing voice signals to and from a telecommunications switch
US6463053B1 (en) Voice-and-fax-over IP dialing plan
JP3684439B2 (ja) 交換網プロトコルを検出するための方法及び装置
US5453984A (en) Communication system for multi-service communication terminal equipment in local networks
US6285680B1 (en) Central site call routing apparatus and method
EP0789470A2 (fr) Passerelle ayant des connexions à des réseaux de parole et de données
JP2005512397A (ja) 一次接続の代替接続に対する使用可能フューチャの形成方法
US20050063360A1 (en) System and method for facilitating packetized calls between managed networks
EP1504359A1 (fr) Architecture d&#39;interface
EP0895381A1 (fr) Réseau de télécommunication avec suppression de multiples compressions/décompressions de paquets de voix
US8675638B2 (en) Method and apparatus for enabling dual tone multi-frequency signal processing in the core voice over internet protocol network
JP2000312239A (ja) ディジタル加入者回線（ｄｓｌ）通信方法
CA2255475C (fr) Methodes et systemes de gestion de l&#39;acheminement de l&#39;information dans un reseau hybride
WO2002032154A2 (fr) Systeme et procede permettant l&#39;interfaçage entre des protocoles de signalisation
WO2001026346A1 (fr) Serveur d&#39;acces et procede de detection d&#39;appel pour le serveur
US8654966B2 (en) Method for dial plan parsing and a system incorporating the same
US6944191B2 (en) Method of optimizing equipment utilization in telecommunication access network
JPH0879383A (ja) インテリジェントネットワークにおけるインテリジェントネットワーク呼着信方法並びにインテリジェントネットワークに使用されるサービス交換装置及び着信交換装置
Cisco Voice over ATM with AAL2 Trunking on the Cisco 7200 Series Routers
US20040213202A1 (en) Method and apparatus for identifying communications in an ATM/circuit-switched communication network
US6826260B1 (en) Method and apparatus for an MLSC state machine
JP2001524781A (ja) 電話回線網インタフェース
JP2670190B2 (ja) ディジタル網の着信方法および通信端末
Chow Protocol issues in interconnecting ISDN, IN, and LAN
KR100295945B1 (ko) 종합정보통신망 교환 시스템에서의 디-채널 패킷 서비스 방법

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 2001529184

Format of ref document f/p: F