WO2001045433A2 - Method an exchange device and a programme for switching telecommunications connections - Google Patents
Method an exchange device and a programme for switching telecommunications connections Download PDFInfo
- Publication number
- WO2001045433A2 WO2001045433A2 PCT/DE2000/003840 DE0003840W WO0145433A2 WO 2001045433 A2 WO2001045433 A2 WO 2001045433A2 DE 0003840 W DE0003840 W DE 0003840W WO 0145433 A2 WO0145433 A2 WO 0145433A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- connection
- switching
- data
- connections
- connection data
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13103—Memory
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13152—Callback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13173—Busy signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13176—Common channel signaling, CCS7
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13179—Fax, still picture
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13209—ISDN
Definitions
- the invention relates to a method for switching telecommunications connections, in which connections between terminals are switched in a switching device.
- connection data are stored in a storage unit.
- connections are physical or virtual connections. Physical connections are made by interconnecting channels. A channel can be formed by a single line. Usually, however, several channels are defined on a line, to which certain time periods are assigned in successive time frames. Another type of connection is a connection that is created using data packets. The data packets belonging to a connection have a common logical channel number. No physical resources have to be made available in the switching facility for the entire duration of the connection. That is why these connections are also called virtual connections.
- connection data are mostly only used for the connection, during the establishment of which they were saved. If data is required that is not stored in the connection data, then commands specified in standardized protocols must be used, for example to query the status of end devices.
- connection data of at least one connection is accessed for switching at least one other connection.
- connection data from other connections conclusions can also be drawn about data that is required for establishing a specific connection. Even if drawing conclusions does not guarantee 100% reliable results, the results are still sufficiently reliable for many applications.
- connection data of one or more other connections are accessed alternatively or cumulatively before, during or after the connection establishment of a connection under consideration. If the connection data is accessed before the connection is established, it may be possible to determine whether the connection is promising before attempting to establish a connection. If the connection data of other connections is accessed after the connection has been set up, conclusions can be drawn, for example, as to whether the connection under consideration can be cleared down again.
- the type of a terminal connected to the switching device is determined from the connection data.
- the occupancy status of this terminal is determined. For example, fax machines and telephones whose occupancy status is busy or free are used as end devices. The evaluated for the determination of the type of terminal
- Connection data concerns either the same terminal device or a different terminal device. First of all, one endeavors to use connection data relating to the same terminal. If such connection data are not available, conclusions can be drawn from the connection data for other terminal devices about the terminal device under consideration.
- the type of a terminal connected to a connection with a plurality of terminals or its occupancy state can be determined in a simple manner by using the method according to the invention, because standardized commands are not required. This also means that end devices can be used that do not support the standardized commands.
- connection data of a connection that has already been triggered are also used. This measure considerably increases the amount of data available, since both the data of existing connections and the data of connections that have already been selected are used.
- the further training makes it possible to read data directly or to draw conclusions on the values of data that could not otherwise be easily accessed.
- connection data of an already triggered connection are used for the switching. Either part of the connection data used is data from selected connections or only such data is used.
- the method according to the invention opens up a source of information which has hitherto remained unused.
- the newly developed source of information can be used in various ways to improve the distribution.
- the method according to the invention is used instead of querying a terminal device by means of a message, which is prescribed in accordance with a standard.
- a message which is prescribed in accordance with a standard.
- the terminal is queried using a FACILITY message for status query.
- certain functions had to be dispensed with.
- the method according to the invention ensures that the status of the terminal can be determined even without querying the terminal, using the data available to the switching device.
- connection data relate to a basic connection according to the ISDN standard (Integrated Services Digital Network) in a next embodiment, the effects achieved are particularly great.
- a basic connection not only different types of devices, e.g. B. fax machines, computers, telephone rate, but also different numbers of devices connected.
- the base connection has two B channels. This results in a large number of connection configurations and occupancy states. If the end devices do not support a direct inquiry, then the The method according to the invention makes a plausible statement about the configuration status at the base connection.
- the method according to the invention is used for realizing a performance feature in which, depending on the state of a terminal connected to the switching device, another terminal is to be recalled.
- This feature is, for example, the feature "Callback on busy" or the feature "Callback on no reply”.
- the design ensures that the callback services are properly carried out even if two end devices with different MS numbers (Multiple Subscriber Number) are connected to the ISDN base connection and the assignment sequence differs from the triggering order differs. Even in cases in which terminals for different transmission services are plugged into the base connection and the assignment sequence differs from the triggering sequence, error-free execution of the callback services is guaranteed.
- the callback service in which the method according to the invention or its further developments are used, also functions properly if a connection at the base connection is a long-term connection which remains set up over several hours.
- An example of such a long-term connection is a connection to the Internet. The long-term connection does not block the callback services for other terminals on the same base connection.
- Callback service is stored in one embodiment in the switching device callback data.
- the connection data and the recall data are used to determine whether a recall should be initiated.
- the callback will only be initiated if there is sufficient prospect of a successful connection establishment. On the other hand, if there is no such prospect, no recall will be initiated.
- a predefined decision table is included in one configuration. With the help of the decision table, the complex interrelationships that have to be taken into account during the test can be clearly recorded, displayed and saved.
- the decision table is specified, for example, depending on customer requirements. Different decision tables can thus be stored in different switching centers.
- the invention also relates to switching devices and programs for switching telecommunications connections.
- the switching devices according to the invention and the programs according to the invention are used to carry out the methods according to the invention and their further developments. Therefore, the technical effects mentioned above also apply to the switching facilities and programs.
- Fig. 2 call data and recall data in a destination switching center
- FIG. 3 shows a flowchart with method steps for determining the occupancy state of a terminal.
- a telephone set 15 of a calling subscriber TlnA is connected to the exchange 10, which is therefore also referred to below as the originating exchange 10.
- a telephone device 16 and a fax device 17 of a called subscriber TlnB are connected to an ISDN basic connection (Integrated Services Digital Network) of the exchange 14.
- the exchange 14 is therefore also referred to below as the destination exchange.
- the exchange 12, also referred to below as the transit exchange 12, lies between the originating exchange 10 and the destination exchange 14.
- the subscriber TlnA meets a busy subscriber TlnB, that is to say the subscriber TlnB calls another subscriber via his telephone set 16.
- the subscriber TlnA wishes to be called back when the subscriber TlnB has ended the connection to the other subscriber.
- Timelines 17 to 24 relate in this order to signaling processes relating to the subscriber TlnA, the originating exchange 10, the transit exchange 12, the destination exchange 14 and the subscriber TlnB.
- the same points in time on the time lines 17 to 24 lie on a line running parallel to the long sides of the sheet.
- the signaling to and from the subscribers TlnA or TlnB is carried out according to the subscriber signaling protocols E-DSS1 (Euro Digital Signal g System One).
- E-DSS1 Euro Digital Signal g System One
- the signaling between the switching centers 10 to 14 takes place in accordance with the international signaling protocol number 7, which has been adopted by the ITU-T (International Telcommunication Union - Telecommunication) and its procedural organization CCITT (Comite Consultatif International Circuitique et Telephonique). Details of the signaling commands shown in FIG. 1 can be found in these standards.
- the subscriber TlnA lifts the handset of his telephone set 15 and thereby causes a connection setup message SETUP to be generated at the originating switching center 10.
- the subscriber TlnA then dials the subscriber number TlnB. The number is transmitted to the originating switching center 10, not shown.
- the originating switching center 10 initiates by sending a ner occupancy message IAM (Initial Address Message)
- Transit switching center 12 the establishment of a connection in the direction of subscriber TlnB.
- the originating switching center 10 sends a call processing message CALL PROCEEDING to the subscriber TlnA in order to signal its telephone set 15 that the call set-up is being continued and no further dialing information is required.
- channels are also reserved for the call to the subscriber TlnB.
- the transit exchange 12 After receiving the occupancy message IAM, the transit exchange 12 also reserves channels for the connection to the subscriber TlnB. In addition, the transit exchange 12 in turn sends an occupancy message IAM to the destination exchange 14.
- a connection setup message SETUP is sent to the telephone set 16 and to the fax set 17 of the subscriber TlnB in order to signal the subscriber TlnA that the subscriber wants to connect.
- the telephone device 16 and the fax device 17 of the subscriber TlnB are busy, so that each of these devices sends a trigger confirmation message RELEASE COMPLETE to the destination switching center 14.
- RELEASE COMPLETE it is stated as the reason for the trigger that the telephone device 16 or the fax device 17 of the subscriber TlnB is busy.
- the release confirmation messages RELEASE COMPLETE are processed in the destination switching center 14. It is determined that the subscriber TlnB can call back. As a result of the trigger confirmation message RELEASE COMPLETE, the m of the exchange 14 are ready held channels for the connection between subscriber TlnA and subscriber TlnB released again. In addition, a Auslose-Nach ⁇ cht REL (Release) to the transit switching ⁇ is sent 12 point. This message includes parameters indicating that the subscriber TlnB is busy, and also one Callback can be initiated as soon as the phone ⁇ gerat 16 of the subscriber TlnB is free again.
- a transit message REL which has the same content as the trigger message REL just received, is sent to the originating exchange 10 by the transit exchange 12.
- the transit switching center 12 also sends a trigger confirmation message RLC (Release Complete) to the target switching center 14.
- the resources provided are released in the originating switching center 10 after receipt of the trigger message REL.
- a connection dismantling message DISCONNECT is sent to the subscriber TlnA.
- this message contains the information that the subscriber TlnB is busy and that a callback is possible.
- the telephone device 15 of the subscriber TlnA releases the occupied B-channel through a subscriber-release-night RELEASE.
- the originating switching center 10 processes the subscriber-release message RELEASE and sends to the transit switching center 12 a trigger confirmation message RLC (Release Complete), with which the trigger message REL received by the transit switching center 12 is confirmed.
- RLC Release Complete
- the originating switching center 10 also sends a trigger confirmation message RELEASE COMPLETE to the telephone set 15.
- the subscriber TlnA recognizes from the selected connection that the subscriber TlnB is busy.
- the subscriber TlnA then initiates, for example by pressing a specific key on his terminal, the feature "call back on busy" and hangs up the handset.
- the call of the feature is communicated to the telecommunication network by means of a service message FACILITY RETURN to the originating switching center 10.
- the originating exchange 10 After receiving the service message FAC-RUCKRUF, the originating exchange 10 is set up a direct signaling connection to the destination exchange 14, cf. the dialog start message TC-BEGIN.
- the control of the service feature "callback on busy" is based on the exchange of signaling data in a TCAP-based dialog
- the destination switching center 14 now checks after receiving the
- Dialog-Begmn-Message TC-BEGIN whether the participant TlnB is free. To do this, it uses FACILITY-STATUS-REQUEST service messages.
- the telephone device 16 of the subscriber TlnB must process the FACILITY STATUS service messages and also signal its status to the destination switching center 14 using service messages. Assume that devices 16, 17 are still busy, "BUSY" state. Therefore, the telephone set 16 sends a service message FACILITY-COMPATIBLE (+) - BUSY.
- the fax device 17 sends a service message FACILITY-COMPATIBLE (-) -BUSY.
- the callback request of the subscriber TlnA m to the destination switching center 14 is noted in a queue.
- the destination switching center 14 signals directly to the originating switching center 10 that the callback request from the subscriber TlnA m the waiting has been entered, see dialog message TC-
- the originating switching center 10 shares the telephone set 15 of the subscriber TlnA with the aid of a service message
- FACILITY CALLBACK ACCEPTED that the callback request m has been entered in the queue. 1 also shows the next service message FACILITY-STATUS-REQUEST, which is sent by the destination switching center 14 to query the status of the telephone device 16 and the fax device 17 of the subscriber TlnB after a B channel has become free becomes. Further queries sent when a B channel becomes free are indicated by points 28.
- Service messages 30 to 34 in FIG. 1 are only exchanged in the order explained above if the devices 16, 17 of the subscriber TlnB support the service feature "callback on busy" and in particular the query of their status.
- the method according to the invention is used when the devices 16, 17 of the subscriber TlnB do not support the status query. This means that messages 30 through 34 cannot be exchanged.
- a method is carried out in the destination switching center 14, with the aid of which the status of the devices 16, 17 of the subscriber TlnB can be determined without exchanging messages with these devices 16, 17. This process is explained below with reference to FIGS. 2 and 3.
- FIG. 2 shows data sets 50 and 52 and callback data sets 54 and 56 which are stored in a memory of the destination switching center 14.
- the call data record 50 relates to the call which has just been drawn to the fax device 17 which is connected to the base connection of the subscriber TlnB. 2 shows six data fields 66 to 70 of the call data record 50, which in this order contain the following data: - the telephone number of the calling subscriber, here number "34",
- the call data 52 relate to a call to the subscriber TlnB currently existing. 2 shows six data fields 80 to 90 of the call data record 52.
- the meaning of the data in the data fields 80 to 90 corresponds in this order to the meaning of the data fields 60 to 70.
- the data field 80 contains the call number "33" of the calling subscriber, which differs from the subscriber TlnA.
- the telephone number "12" of the subscriber TlnB is noted in the data field 82.
- a telephone call TEL is entered as a service in data field 84. It is noted in data field 86 that it is an incoming call, i. H. that the subscriber TlnB has been called. In data field 88 it is noted as the current status of the connection that the "connected" state has been reached.
- the data field 90 is not assigned a valid value since there is still no reason for the draw for the connection noted in the call data record 52.
- the callback records 54 and 56 are stored in a queue.
- the callback record 54 is the first element and the callback record 56 is the second element. Further callback data records of the queue are indicated by points 100.
- FIG. 2 shows two data fields 110 and 112 of the callback data record 54.
- the telephone number "12" of the subscriber to be called is entered, ie here the telephone number of the Participant TlnB.
- the requested field is in data field 112
- the callback data record 56 contains two data fields 120 and 122, the meaning of which corresponds to that of the data fields 110 and 112.
- the telephone number "12" of the subscriber TlnB is stored in the data field 120.
- the transmission of a fax is entered in data field 122 as the requested service.
- Points 124 illustrate further data fields of the recall data set 56.
- the switching center 14 contains a decision logic 130 which makes decisions with the aid of a circuit or with the aid of a program on the basis of the data stored in the call data records 50, 52 and the callback data records 54, 56, cf. Arrows 132 and 134. An example of such a decision is explained below with reference to FIG. 3.
- FIG. 3 shows a flowchart with method steps for determining the state of a terminal connected to the switching center 14. The method is only carried out if there is at least one callback data record m in the queue.
- the method shown in FIG. 3 begins in a method step 200 when a B channel on a base connection of the target switching center 14 becomes free.
- the next element to be processed is read from the queue, e.g. B. the callback record 54.
- method step 204 the data of the recall data record that was read in method step 202 is used to and the data of the call data records 50 and 52 for the considered basic connection, a statement is made about the type of device on the considered basic connection and about its occupancy status.
- Decision logic 130 is used, cf. also Fig. 2.
- the base connection with the number "12" is affected, cf. Data field 110.
- the callback data record 54 relates to a telephone call, cf. Data field 112. From call data record 50 it can be seen that a fax connection has just become free, cf. Data fields 64 and 70.
- method step 204 it is determined in method step 204 that although a compatible device, here a telephone device, namely the telephone device 16, is connected to the base connection with the call number “12”, this device is however busy. As a result, the method is continued without further actions immediately after the method step 204 has been carried out, a method step 212 explained below.
- a compatible device here a telephone device, namely the telephone device 16
- this device is however busy.
- method step 204 Two other decisions can be made in method step 204. If it is determined that the terminal device is "compatible and free" for the required callback, then immediately after method step 204, method step 208 follows, with which a callback is initiated. For this, a short period of time is waited, for example 10 s. Method step 204 is then repeated. If the terminal affected by the callback is still "free", a dialog message is sent to the originating exchange concerned TC-CONT "REMOTE USER FREE" sent, in which it is noted that the terminal is "compatible and free”. The method is then ended in a processing step 214. If, on the other hand, it is determined in method step 204 that there is no suitable terminal for the callback at the relevant base connection, the element currently being processed is removed from the queue, cf. Method step 210.
- step 212 follows immediately. Step 212 checks whether there are further callback data records in the queue to be processed. If this is the case, the method is continued in method step 202. The method is thus in a loop from method steps 202 to 212.
- the callback data record 56 is read from the queue in method step 202.
- method step 204 it is determined during the second pass on the basis of the call data record 50 of the triggered call that a free FAX device is now available for the second callback job m in the queue, namely the fax device 17. This means that e "compatible and free "terminal could be determined. Consequently, the callback is initiated in method step 208 immediately after method step 204 and a corresponding dialog message TC-CONT is sent to the relevant originating exchange.
- process step 214 immediately follows in which process the process is ended.
- the process shown in FIG. 3 is repeated when a B channel becomes free. If the B channel occupied by the telephone device 16 becomes free, the callback is initiated immediately after the method step 204 in method step 208, a message TC-CONT "REMOTE USER FREE" being sent to the originating switching center 10. In the originating switching center 10, steps for notifying the subscriber TlnA are then carried out in accordance with the standard.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR0017021-6A BR0017021A (en) | 1999-12-17 | 2000-10-31 | Process, transmission facilities and programs for the transmission of telecommunications links |
EP00987058A EP1238563A2 (en) | 1999-12-17 | 2000-10-31 | Method an exchange device and a programme for switching telecommunications connections |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999161101 DE19961101A1 (en) | 1999-12-17 | 1999-12-17 | Methods, switching devices and programs for switching telecommunications connections |
DE19961101.7 | 1999-12-17 |
Publications (2)
Publication Number | Publication Date |
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WO2001045433A2 true WO2001045433A2 (en) | 2001-06-21 |
WO2001045433A3 WO2001045433A3 (en) | 2002-01-17 |
Family
ID=7933164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/003840 WO2001045433A2 (en) | 1999-12-17 | 2000-10-31 | Method an exchange device and a programme for switching telecommunications connections |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1238563A2 (en) |
CN (1) | CN1435071A (en) |
BR (1) | BR0017021A (en) |
DE (1) | DE19961101A1 (en) |
WO (1) | WO2001045433A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170170910A1 (en) * | 2015-12-14 | 2017-06-15 | Nikola Alic | Increase in reach of unrepeatered fiber transmission |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4567323A (en) * | 1983-07-12 | 1986-01-28 | At&T Bell Laboratories | Method and apparatus for providing a plurality of special services |
US5023868A (en) * | 1988-12-29 | 1991-06-11 | At&T Bell Laboratories | Automated call handling apparatus |
EP0825753A2 (en) * | 1996-08-13 | 1998-02-25 | AT&T Corp. | 800 Number callback |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0433451A (en) * | 1990-05-30 | 1992-02-04 | Fujitsu Ltd | Busy state camp-on notice control system |
JP3130651B2 (en) * | 1992-06-15 | 2001-01-31 | 株式会社東芝 | Private branch exchange |
-
1999
- 1999-12-17 DE DE1999161101 patent/DE19961101A1/en not_active Withdrawn
-
2000
- 2000-10-31 CN CN 00818949 patent/CN1435071A/en active Pending
- 2000-10-31 BR BR0017021-6A patent/BR0017021A/en not_active IP Right Cessation
- 2000-10-31 WO PCT/DE2000/003840 patent/WO2001045433A2/en not_active Application Discontinuation
- 2000-10-31 EP EP00987058A patent/EP1238563A2/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4567323A (en) * | 1983-07-12 | 1986-01-28 | At&T Bell Laboratories | Method and apparatus for providing a plurality of special services |
US5023868A (en) * | 1988-12-29 | 1991-06-11 | At&T Bell Laboratories | Automated call handling apparatus |
EP0825753A2 (en) * | 1996-08-13 | 1998-02-25 | AT&T Corp. | 800 Number callback |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 016, no. 204 (E-1202), 15. Mai 1992 (1992-05-15) & JP 04 033451 A (FUJITSU LTD;OTHERS: 01), 4. Februar 1992 (1992-02-04) * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 195 (E-1533), 5. April 1994 (1994-04-05) & JP 05 347668 A (TOSHIBA CORP), 27. Dezember 1993 (1993-12-27) * |
Also Published As
Publication number | Publication date |
---|---|
WO2001045433A3 (en) | 2002-01-17 |
DE19961101A1 (en) | 2001-07-05 |
CN1435071A (en) | 2003-08-06 |
BR0017021A (en) | 2003-01-07 |
EP1238563A2 (en) | 2002-09-11 |
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