METHOD AND SYSTEM FOR ESTABLISHING A TELECOMMUNICATION CONNECTION BETWEEN TWO TERMINALS IN A TELECOMMUNICATIONS SYSTEM

Abstract: The invention relates to a method and a system for establishing a telecommunication connection between two terminals (5, 6) in a telecommunications system, which includes a telecommunications network (4), one or more telecommunication exchanges (2) connected to the telecommunications network (4), through which exchange(s) the connection is routed. In the method first terminal device (5) connects to second terminal device (6) through the telecommunications exchange (2). The first terminal device (5) is a telephone and/or a telefax terminal (5, 5a) and the second terminal device (6) is a telephone and/or a telefax terminal with alternatively the same calling identifier (6, 6a). In the method the calling signal of the first terminal device (5) is identified and based on this identification the second terminal device (6) is selected. According to the invention the telecommunications network (4) includes an identifying device (1) that identifies the calling signal of the first terminal device (5). Based on this identification the connection is directed to the second terminal device (6).

Description: METHOD AND SYSTEM FOR ESTABLISHING A TELECOMMUNICATION CONNECTION BETWEEN TWO TERMINALS IN A TELECOMMUNICATIONS SYSTEM The invention relates to a method defined in the preamble of the claim 1 and a system set forth in the preamble of claim 6 for establishing a telecommunication connection in a telecommunications system. It is previously known to use a method for establishing a telecommuni¬ cation connection between two terminal devices in a telecommunications system, where the terminal device receiving the connection, e.g. a telephone and a telefax ter¬ minal in combination, identifies the sending terminal device and thus based on the identification opens the connection. For instance in the patent publication DE 4008968 a connection is established between two terminal devices and after the connection has been established the terminal device receiving the connection determines from the re- ceived signal its functional form, e.g. whether speech, images, text or any other infor¬ mation is sent or received. Nowadays a teleoperator offers attainability service to secure the attain¬ ability, where calls or telecopy messages of the same number can be chained to more numerous physical extensions through a telecommunications system. If the same call- ing number is called both by a phone and a telefax, the problem is that it is not possible to identify the calling terminal device in the telecommunications network before estab¬ lishing the connection, e.g. telefax terminal identification, but the identification takes place only in the receiving terminal device. Then the call chaining to different objects cannot either be made, which is effected on the grounds of the calling terminal device of the telecommunications network . The purpose of the invention is to eliminate the drawbacks mentioned above. The purpose of the invention is particularly to set forth the independence of a terminal device receiving the connection from the identification of the operational mode of the connection. The purpose of the invention is also to set forth the attainabil- ity service that is obtained, when the identification of the terminal device is made al¬ ready in the telecommunications network and therefore the connection is directed to a proper terminal device or call chaining. For the characteristic features of the invention reference is made to ac¬ companying claims. In the method according to the invention a telecommunication connection is established between two terminal devices in a telecommunications system, which includes a telecommunications network. To the telecommunications network have been combined one or more telecommunications exchange. In the method the first terminal device contacts to another terminal device through the telecommunications network, where the first terminal device comprises a telephone, telefax terminal or the like. The second terminal device comprises a telephone, telefax terminal or the like working with the same calling identification. In the method the calling signal of the first terminal device is identified and based on this identification the connection mode to the second terminal device is selected, or the question is, whether to choose a tele¬ phone or facsimile connection. According to the invention the calling signal of the first terminal device is identified in the telecommunications network and the connection is directed based on this identification to the second terminal device. Because of the invention the selection of the terminal device answering the call and the call chaining can be made after the identification of the terminal de¬ vice that is calling in the telecommunications network, whereby a teleoperator may offer more versatile attainability service. The terminal, e.g. a telefax, can be more simple and more advantageous, because there is no need for the terminal device to take care of the identification. In one embodiment of the method the first terminal device is identified in the identifying device during certain time period, so that if after the expiration of this period the first terminal device cannot be identified, a connection is established to an- other terminal device in compliance with an assumption connection set in the tele¬ communications network. In other words, if the first terminal device does not send a calling signal typical to a telefax terminal, a connection is established between the terminal devices as a usual call. In one embodiment of the method it is used in the identification of the first terminal device for the telecommunication between the telecommunications net¬ work and the identifying device TUO, R2, ILM/PRI or corresponding signalling. In one embodiment of the method the connection is directed to the tele¬ phone calling number or through call chaining to certain more numerous telephone extensions, if the first terminal device is a telephone and the connection is directed to the call number or through the telefax terminal to certain several telefax extension, if the first terminal device is identified as a telefax terminal. The telecommunications system according to the invention includes ter¬ minal devices, between which the desired connection will be established and to which the terminal devices are connected. The system includes also a telecommunications exchange, through which the connection will be routed and which is connected to the telecommunications network. According to the invention the telecommunications net¬ work includes an identification device identifying the calling signal of the terminal device, which establishes the connection, and sending a signal to the telecommunica¬ tions network based on the identification. In one embodiment of the system the telecommunications exchange is an intelligent network exchange or an intelligent network exchange connected to the tele¬ communications exchange. The intelligent network exchange uses more versatile sig¬ nalling and offers more varied services than the telecommunications exchange. In one embodiment of the system the telecommunications network is a telephone network. In one embodiment of the system the telephone device comprises a tele¬ phone, a telefax device or the like. In one embodiment of the system the terminal device establishing the connection is a telefax terminal, whereby the frequency of the terminal device is 1 100 Hz ± 38 Hz and the calling signal is on during 0,5 seconds and off during 3 seconds. The calling signal is also repeated during 35 second ± 5 seconds. The invention will be described in detail in the following by exemplary embodiments with reference to the enclosed drawing, in which: figure 1 shows a system according to the invention; figure 2 shows a flow chart of signals in one embodiment according to the invention; figure 3 shows a flow chart of signals in another embodiment according to the invention. In the figure 1 has been presented a system according to the invention. Terminal devices 5, 6 have been connected to the telecommunications network 4. The telecommunications network 4 can be composed of one or more different networks, e.g. a combination of a local network and a usual network. The telecommunications exchange 2 and the intelligent network exchange 3 have been connected to the tele¬ communications network 4. The identifying device 1 has been connected to the intelli¬ gent network 3. The telecommunications exchange 2 and the intelligent network ex¬ change 3 may also be stationary connected to each other or they can be parts of one and same exchange. In the figure 2 has been presented a flow chart of signals for different parts of the method according to the invention by a certain signalling mode (TUP), when the establishing of a connection of two telefax terminals 5a, 6a is concerned. The telefax terminal 5a sends a calling signal to the telecommunications exchange 2, which sends IAI-signal, starting address signal, to the intelligent network exchange 3, which then sends IAI-signal to the identifying device 1. The intelligent network exchange 3 sends ACM-signal, acknowledgement of the reception of the message, to the tele¬ communications exchange 2. The identifying device 1 answers first by ACM-signal to the intelligent network exchange 3 and then by ANU-signal, answering signal, to the intelligent networks exchange 3, and in the message of the answering signal there is indicated the success of the identification of the telefax terminal 5a establishing the connection. A thickened part in the short line leaving the intelligent network exchange box 3 means the time, which the identifying device 1 spends for identifying the telefax terminal 5a. The intelligent network exchange 3 sends IAI-signal to the telecommuni¬ cations exchange 2 and the signal includes the calling number of the telefax terminal 6a. The telecommunications exchange 2 sends a call to the telefax terminal 6a. The intelligent network exchange 3 sends still CLF-signal, breaking of the connection, to the identifying device 1 and the identifying device 1 answers by RLG-signal, acknowl¬ edgement of the breaking of the connection, to the intelligent network exchange 3. The telecommunications exchange 2 sends ACM-signal to the intelligent network exchange 3 which signal indicates that the telefax terminal 6a is free for the establishing of the connection. The telefax terminal 6a answers to the call of the telefax terminal 5a to the telecommunications exchange 2, which sends an ANU-signal, the telefax terminal 6a is answering, to the intelligent network exchange 3. The intelligent network exchange 3 sends ANU-signal to the telecommunications exchange 2 and the connection between the telefax terminals 5a, 6a has been established. In the figure 3 has been presented a flow chart of signals for different parts of the method according to the invention, when the establishing of the connection of two telephones 5, 6 is in question. The signal flow is almost the same as in connec¬ tion with telefax terminals 5a, 6a in the figure 2. The identifying device 1 tries to iden¬ tify the call signal coming from the intelligent network exchange 3 and the identifying is continued, until the time limit used in the identifying is reached. Then the intelligent network exchange 3 sends IAI-signal with an assumption value having the call number of the telephone 6. In the following will be explained the operation of the telecommunica¬ tions network model for the system in question. The calling terminal device 5 calls the same telephone/telefax calling number. This calling number is identified in the tele- communications network 4 as requiring the intelligent network guiding, whereby as a consequence the call is directed to the intelligent network exchange 3 and under the service logic, SCF, belonging to the service guiding function in the intelligent network exchange 3. In the SCF the service identifies that a "telefax identification" -user is con¬ cerned and directs the connection to a separate identifying device 1. The identifying device 1 is connected to a communications network 4 by a normal signalling (TUP, R2, ILM/PRI). The identifying device 1 listens the connection in order to observe from the line the calling signal of the telefax terminal 5a. In the following the operation of the identification service will be ex¬ plained, which the attainability service utilizes. The identification service routes the call to the identification device 1 and actuates at the same time a very short "no an¬ swer" time control Tl, duration 5-10 s, and remains to wait either for an answer or the end of the time control. The identifying device 1 searches the calling signal of the tele¬ fax terminal 5a. If the calling signal is not found during the time control tuned in the identification service, the identification service makes after the time control has gone off a new routing to the number of the telephone 6 or to the attainability chain. The identification service breaks off the connection from the identification service to the identifying device 1. If the calling signal of the telefax terminal 5a is observed, the identification device 1 sends an ANU-signal that the intelligent network exchange 3 suppresses. The identification service routes the call to the telefax terminal 6a or the corresponding attainability chain, and the connection to the identification device 1 is broken off. In the following will be explained the operation of the identifying device 1. The identification device 1 is connected to the telecommunications network 4 with a 2 Mbit/s connection. The identifying device should be able to perform the establishing and setdown procedures of a normal connection. The requirements for the application to be used for the identification itself are simple. It is, however, justifiable to make sure that the connection is coupled to the identifying device without any answering sign, which can be secured by a (network signalling) connection of TUP-level. When a call comes from the calling device 5, the identification of the telefax calling signal from the connection line is activated. If no calling signal is observed, identification efforts will be continued, until the connection breaks up by the intelligent network exchange 3. If the calling signal is identified, an answering sign is immediately sent. Then the intelli¬ gent network exchange 3 takes care of the setdown of the connection. The invention is not limited only to the embodiment example described above, but many modifications are possible when staying within the inventive concept defined in the following patent claims.

Claims: CLAIMS 1. A method for establishing a telecommunication connection between two terminals in a telecommunications system, which includes a telecommunications network and one or more telecommunication exchanges connected to the telecommu- nications network, in which method first terminal device establishes a connection to second terminal device through the telecommunications network, whereby the first terminal device is a telephone and/or a telefax terminal, the second terminal device is a telephone and/or a telefax terminal with alternatively the same calling identifier, and in which method it is identified a calling signal of the first terminal device and on the basis of the identification the connection is directed to the second terminal device, characterized in that before establishing connection the calling signal of the first terminal device is identified in the telecommunications network and based on this identification a connection to the second terminal device is established. 2. A method according to claim 1, characterized in that the first terminal device is identified in a telecommunications exchange; and that the identifi¬ cation is made during a certain time period. 3. A method according to claims 1 -2, characterized in that the connection of the first terminal device is established to the second terminal device after the expiration of a certain time period in compliance with the assumption connection set in the telecommunications exchange. 4. A method according to any of the preceding claims 1 - 3, characterized in that TUP, R2, ILM/RPI or corresponding signalling is used for the telecommunications between the telecommunications exchange and the identifying device in the identification of the first terminal device. 5. A method according to any of the preceding claims 1 - 4, characterized in that if the first terminal device is identified as a telephone in the telecommunications network, the connection is directed based on this identification directly to the calling number imposed for the telephone or by the call chaining to cer¬ tain telephone extensions, and if the first terminal device is identified in the telecom- munications network as a telefax terminal, the connection is directed on the grounds of the identification directly for the telefax terminal to certain calling number or to certain facsimile extensions by call chaining. 6. A telecommunications system for establishing a telecommunication connection, which system includes: - first and second terminal devices (5, 6), between which the connection is estab¬ lished; - a telecommunications network (4), by which the connection is established and to which the terminal devices are connected; - a telecommunications exchange (2), through which the connection is routed and which is connected to the telecommunications network (4), characterized in that the telecommunications network (4) includes an identifying device (1) that has been arranged to identify a calling signal of the first terminal device (5) and to send based on the identification a signal to the telecommunications exchange (2). 7. A system according to the claim 6, characterized in that the telecommunications exchange (2) is an intelligent network exchange (3) or that an in¬ telligent network exchange has been connected to the telecommunications exchange (2). 8. A system according to the claim 6,chracterized in that the tele¬ communications network (4) is a telephone network. 9. A system according to the claim 7 or 8, characterized in that the terminal device (5, 6) is a telephone and/or a telefax terminal according to the stan- dard. 10. A system according to any of the preceding claims 7 - 9, characterized in that the first terminal device (5) is a telefax terminal with the frequency of the calling signal 1100 Hz ± 38 Hz, and which calling signal is 0,5 sec¬ onds on and 3 seconds off; and that the calling signal is repeated 35 seconds ± 5 during seconds.

Inventors: KAEAERIAE PETTERI, ROMO JORMA, YLI-AEYHOE JANNE, KAEAERIAE, PETTERI, ROMO, JORMA, YLI-AEYHOE, JANNE
Applicants: FINLAND TELECOM OY, KAEAERIAE PETTERI, ROMO JORMA, YLI AEYHOE JANNE, KAEAERIAE, PETTERI, ROMO, JORMA, TELECOM FINLAND OY, YLI-AEYHOE, JANNE
Application year: 1997
Main classification: H04Q3
IPC codes: H04Q3