Method for signalling services in telephone networks with analog subscriber connections

The invention relates to a method according to the preamble of claim 1.

In digital telephone networks, such as ISDN, it is in digital subscriber lines possible already when a connection is a so-called service identification to transfer. This service identification (Bearer Capability [BC] or Higher Layer Capability [HLC]) is in a special signaling channel (D channel), together with the Call signaling, called to the telephone network and from this to the terminal transmitted and used there to a suitable terminal for receiving the select call. Thus, for example when a notice for a fax transmission Fax Receive suitable device, at the announced data transfer a data modem switched automatically without driven by a same subscriber Phone is outputted an acoustic signal.

In the analog domain, where no signaling channel is available, it is so far only possible after connection, corresponding service identifiers in the form of ID tones at regular intervals on the telephone line (a / b - wire) are output to transfer, as so-called example of fax machines with the CNG signal is practiced. Since such identification tones only after the adoption of a Connection can be received, is a specific connection of a corresponding Terminal, for example, with so-called active fax switch, after the conclusion of a paid connection possible. This has the result that a connection to a subscriber line used for different services and then made is and must be paid for by the caller, if only a telephone call is intended, but, for example, because of the absence of the operator does not materialize. Older, so-called manual fax machines that no CNG - output signal is from a remote site Moreover, not recognized, and a transfer is subject to prior telephone Agreement requires the user.

In order to eliminate the disadvantages described above, was in the earlier German Patent Application 196 15 304.2 (filing date 18. 4. 1996) already a process proposed in which in connection with the 25/50 Hz -Rufsignal the transmission of a sound signal as a device recognition signal to the called subscriber line done and there connected appliance that after evaluation Detection signal line is and thus the chargeable connection can come about. Prerequisite that such a method is carried out can be, is that in the terminals and in the network node of the telephone network necessary signal generators, detection circuits, memory and Delay elements provided and the programs existing control processors be modified and expanded accordingly. This requires, in addition to extra Components, development and testing time and provides an overall significant Onerous.

The invention now provides a further process for pre-signaling of a service during connection setup with analog subscriber lines are available, the existing or proposed imposing sufficiently tested devices and routines of the telephone network and the terminal uses and on developing new Components largely dispensed. The invention also for implementing the process within a Telephone network with analog subscriber lines suitable devices.

The method of the invention is shown in the patent claim. 1 It uses under other facilities that the realization of a new telephone service feature with the label "CLIP" (Calling Line Identification Presentation) have been created or still need to be created. CLIP is operated in analog Subscriber lines an indication of the number of the calling party when called party permit and is for example in the network of Deutsche Telekom AG from introduced 1998th According to the European standards ETS 300659-1 and ETS 300778-1 looks CLIP during call setup data transfer from Destination network node before the called subscriber. This is done by means of frequency shift keying (G) in the period between the first and second ring signal, or, when using a Aufwecksignales (Terminal Equipment Alerting Signal), between this and the first ring and comprises in addition to the number of the calling subscriber line yet the type of call (eg, automatic callback, news that News for Participants are present, etc.) and a number of other parameters. The transmitted data can after demodulation and decoding in a suitable circuit of Subscriber terminal, before receiving the call on a display are displayed.

The transmission of the service code from the target node of the telephone network to the called Subscriber carried out in accordance with the invention as an FSK modulated signal, such as in The context of the caller function data to be transmitted. A special demodulator and Decoder for the service identifier is not necessary. Only the control automatic connection or activation of the subscriber line connected devices, depending on the transmitted service identification, must in the Terminals to be implemented. When assigning a plurality of different devices to same subscriber, the transmitted service identification by the for Demodulation and decoding of the Caller ID information existing circuit of the made devices, such as the telephone set, the other terminals available will.

The transmission of the service code from the calling subscriber to Originating node of the telephone network makes use of existing Transmission options and does not require additional tone generators or Tonfrequenzempfänger as they would be required to transmit an identification Stones. As additional devices must only in the terminals memory for each Service identification, and in acting as a source network node network node if necessary Memory may be provided to latch the Service codes to the disclosure after receiving the dialing information to enable. The work programs of the originating network node also has a Routine for the treatment and transmission of this calling from the terminals created transmitted service IDs to the respective destination network node and the Processing procedure for the transfer of CLIP information from the destination network node to a selected subscriber line be modified so that the service identification in addition to the CLIP information using the same equipment can be transferred.

Further developments of the method according to the invention are in the dependent claims 2 to 7 indicated. To perform the process, suitable devices are the subject of Independent claims 8, 9 and 10. FIG.

The training described in claim 2 relates to the transmission of Service identification from the target node of the telephone network to an analog Subscriber line together with the CLIP - Information. This can be Service identification and telephone number of the calling subscriber in the same data format transfer. Separate data security measures for the transfer of the service indicator account for it. The demodulation and decoding can together with the CLIP information carried out using the same facilities. Many devices need then do not contain actual FSK demodulators and decoders. You can the decoded service code of the corresponding devices of the same Subscriber line operated for CLIP transmission equipped terminal take over, which is particularly advantageous for combined multi-service terminals.

Claim 3 provides for the use of DTMF characters to transfer the Service identification prior to the originating node. This is advantageous because in brief all network nodes will be equipped with DTMF signal receivers and then also can be used to receive the service identification.

One embodiment described in Claim 4 of the method according to the invention provides for the transfer of several service identifiers including a service identification for Telephone service before, with telephone service in so far as a priority, that in case of failure or for the use of devices that (still) not transfer any service code, telephone service is signaled.

A reproduced in claim 5 variant of this method according to the invention looks for telephone service no service code before, but the activation of the phone on called terminal when a call is no other service identification is transmitted. Again, it is thus possible, for example during a transition period, terminals that still transmit any service identification, reuse.

The claims 6 and 7 relate formed from DTMF character codes for each Service identifiers that are sure different from other DTMF encoded information leave.

Claim 8 describes a for use in the method according to the invention suitable, provided for the execution of an individual service telecommunication terminal. As a circuit for receiving of service identifiers modulated as FSK signals is advantageously used the same circuit that also for receiving CLIP - Information is used. To issue the own service identification in the form of DTMF - Character serves to generate dial tone present in any case DTMF - generator.

Claim 9 relates to a specially trained as a voice terminal, to Use in the method according to the invention suitable telecommunications terminal. The terminal may be both so formed that it has a as a calling terminal outputs telephone service identifier or so that it, in accordance with example embodiments of a method Claim 4 or claim 5, no such issue provides. In case that the process is carried out in accordance with Patent Claim 5, may additionally the Memory for the telephone service identifier saved and the activation of the terminal be conditional upon no other service code has been received.

Claim 10 relates to a Mehrdienste- terminal having the advantage that a Circuit for receiving and decoding service identifications of a device part, eg the phone, as used by the other services perceiving devices Share with can.

Subject matter of claim 11 is the configuration of the circuit for receiving and to decode the transmitted service identifications in such a way that it also from Destination network node transmitted CLIP - receives information.

An embodiment for the method according to the invention and a Exemplary embodiment of a for use in the method according to the invention suitable more services - terminal are below with reference to several figures described in detail:

The figures show in detail:<dl tsize="9"><dt>Fig.1 -</dt><dd>a flowchart of a fax transmission in accordance with the The method according to the invention,</dd><dt>Fig.2 -</dt><dd>a block diagram of a for use in the method according to the Invention suitable Mehrdienste- terminal,</dd><dt>Figure 3a, b. -</dt><dd>Functional processes in a Mehrdienste- terminal.</dd></dl>

In Fig. 1, on a time axis t, above the timing of the method according to the Invention to a calling analog subscriber line of a telephone network RA, including the corresponding procedure at one of the local loop RA called, like subscriber GA schematically reproduced. After a Participants in a calling terminal connected there a fax machine or multi-service terminal with fax function by inserting a template for information to be provided Transmission mode prepared, dialed the number of the target and the automatic Expiry of the fax has started transmission, the fax machine is at a time 1, Connecting cable and is characterized as having the input stage of the following Originating network node designated associated network node of the telephone network connected.

If the fax machine via a telecommunications system (PBX) to the telephone network connected, has to seize a lead initially an internal connection of the TK - plant occupies and after a brief pause, the so-called external line code (AKZ) are emitted. The fax machine then waits a predetermined, as Midterm Election time designated period or, if it is with a device Dial tone is, until it receives the dial tone from the network node before it further steps to establish a connection (including sending the service code) triggers.

Deviating from the normal sequence of connection setup, the next Transmission of input from participants destination number (selection information) to the Originating network node provides the fax machine, there is a time 2 first his service code, the code for "Fax service" to the originating network node. This service indicator is coded in a special read-only memory stored eg and is as DTMF character code of the form * DK #, where DK for each of the Service characteristic, two-digit number is how an election information and Using for the transmission of election information in the terminal and in Network nodes existing facilities issued to the network node. Based on the Codes used is detected, the service ID in the network nodes as such and cached. Only after that, at time 3, the terminal transmits the Election information from the network node, as usual, for the construction of the participant desired compound.

The service identification will now together with the dialing information, via the telephone network to a destination network node, which is associated with the selected terminal, passed and is there for output to the called subscriber is available.

This edition takes place in a time interval 6, the time between a first, for Time point 5 is sent to the called terminal, and a second, 5a at the time issued to this terminal is ringing, in the form of FSK-modulated data. This has the advantage that mobile terminals used for receiving a so-called CLIP (Calling Line Identification Presentation) - Information equipped, no additional require facilities for the reception of the service indicator because the CLIP information on also during the period between the first two call signals as an FSK modulated signal the called terminal is transmitted and the purpose existing facilities for Transfer service indicator can be used with. Is particularly easy Transfer service indicator when the purpose within the CLIP data format, must be slightly modified, is done because this saves transmission time and Measures for data backup and fault detection for both types of information can be carried out jointly. Instead in the time between the first two can call signals the CLIP information and therefore also the service identification in transferred following a special wake-up, prior to the issue of first ring will.

All devices connected to the called terminal devices now compare the above a separate receiving means for the receiving device or a Receiving means of another, connected to the called terminal, for receiving CLIP equipped terminal, received service identifier with the stored own service identification. Only the fax machine detects match and turns automatically to the to lead. The connection is at the time 7 come about. In principle, this is even before the second ring signal 5a to a Point 7a possible.

Connected to the lead receives on connected at called terminal Fax now from the calling fax machine at regular intervals (at times 4, 4a, 4b, etc.) emitted CNG - signals. It recognizes one or more of these signals as Faxgeräteruf and starts at a time 8, the facsimile transmission procedure of the calling remote terminal signals the connection acceptance and this is caused to a time 9 at the transmitting end to start the fax transmission. In a subsequent period 10, the transmission of data information. After their Termination is triggered to connect to a date 11th

In FIG. 2 is a block diagram of a terminal Mehrdienste- is shown schematically. Four provided for the settlement of various services appliance parts, a telephone part 14 with the speech circuit, listeners and other Telefonfünktionen, voicemail 15, a data modem 16 with PC interface and a facsimile device part 17 are connected via an as central control unit functioning processor 13 with each other and to a Lead a / b leading port 12. The latter also includes a Caller identification device 12 and a receiving circuit for FSK modulated signals 12 b for receiving and decoding of CLIP - Information and from the destination network node forth transmitted service identifications. The central control unit also has access to common functional modules such as a keyboard and display of existing operator interface 18, a DTMF - generator 19 to generate DTMF - mark and a Memory unit 20, in addition to device settings, speed dial numbers and other data the pieces of equipment associated service identifiers are permanently stored.

If such a multi-service terminal according to the method of the invention as taken calling terminal in operation, it is as shown in Fig. 3a reproduced, first the connecting line and waiting as long as it is equipped with dial tone, receipt of the dial tone from, otherwise it maintains a predetermined interval. After that notes the central control unit, which device part has been activated. After 3a checks the control unit initially the data modem and the connected with this PC on Existence of a transfer desire, then the fax machines part if this for Transmission mode is prepared. If an activated device part is found, then the this associated service identifier retrieved from the memory and the DTMF generator output on the lead line. If no enabled devices part is found, then assumed that telephone service is desired, and it is the force of language services Service identification or - if for telephone service no service code is provided - No service indicator output.

Subsequent to the issuance of the service identification is done in the same way the Sending the dialing information that is retrieved from a local phone number memory or is input manually. By the selection information, the telephone network is caused to produce the desired compound. is In the absence of specific services association only sent the selection information without prior service identification.

When called terminal receives the multi-service terminal as shown in Fig. 3b a first call signal and then the Caller ID information, in addition to other Information includes the number of the calling terminal, together with a Service identification. While the number of the calling subscriber line is buffered and optionally displayed on the screen triggers the service indicator a search of the appropriate communication to the terminal member by the control means out . The controller compares this received service identification succession service indicator for data transfer, for fax transmission and for Voice transmission. Depending on which service by the received service identification is signaled, the PC, the fax machine or the telephone with possibly available is activated answering machine and, if possible, causes the connection is accepted. Is missing CLIP - Information (FSK - transfer) or a service identification or a received incorrect service code, as is the intended for voice transmission Device part activated.

LIST OF REFERENCE NUMBERS

<dl tsize="8" compact="compact"><dt>RA</dt><dd>calling terminal</dd><dt>GA</dt><dd>Called terminal</dd><dt>t</dt><dd>timeline</dd><dt>1</dt><dd>Assignment of the connecting cable at the calling terminal</dd><dt>2</dt><dd>Transfer of service identification by the calling terminal</dd><dt>3</dt><dd>Transmission of selection information by the calling terminal</dd><dt>4, 4a, 4b</dt><dd>Transmission of the CNG signal by the calling facsimile terminal</dd><dt>5, 5a</dt><dd>1. and 2. ringing at the called terminal</dd><dt>6</dt><dd>FSK data transmission (CLIP + service code) from the destination network node to the called terminal</dd><dt>7, 7a</dt><dd>Connection acceptance by the called fax terminal</dd><dt>8th</dt><dd>Start the fax - transmission procedure (receiving end)</dd><dt>9</dt><dd>Start the fax - transmission procedure (transmission side)</dd><dt>10</dt><dd>Period of facsimile transmissions</dd><dt>11</dt><dd>Triggering the connection</dd><dt>12</dt><dd>Interface for connecting cable</dd><dt>12 a</dt><dd>Caller identification circuit</dd><dt>12 b</dt><dd>Receiving circuit for FSK-modulated signals</dd><dt>13</dt><dd>Central Control Unit / Processor</dd><dt>14</dt><dd>Telephone part</dd><dt>15</dt><dd>Answering machine</dd><dt>16</dt><dd>data modem</dd><dt>17</dt><dd>Fax - equipment part</dd><dt>18</dt><dd>Operator interface (keypad, display)</dd><dt>19</dt><dd>DTMF - Generator</dd><dt>20</dt><dd>memory unit</dd></dl>