DE102004028146A1 - Circuit arrangement for making voice connection between Internet, telecommunications system has speech end detector that recognizes end of voice connection, informs controller so connection terminated - Google Patents

Abstract

The circuit arrangement (18) has a first interface adapted for connection to a terminal side output of a telecommunications system (14), a second interface for connection to a terminal side output of an Internet telephone adapter (15), a call recognition device for detecting a call entering at both interfaces, a controller and a speech end detector that recognizes the end of a voice connection and informs the controller about this so the connection is terminated.

Description

The The invention relates to a circuit arrangement for producing a Call connection between the Internet and a telecommunications system.

since some time besides traditional telecommunications, also called "telephony" or "telephony", increasingly the possibility been recognized, calls also over to run the internet. In summary are all kinds of conversations by means of voice, data, fax services, video services and others under Use of the Internet Protocol (IP) referred to as "IP telephony".

The Equipment, with which you can make calls on the Internet or intranet using the Internet protocol (IP) possible are referred to as IP phones. These include so-called Voice over Internet protocol (VoIP) phones, connection boxes with usual Phones, soft phones on a personal computer (PC) or PDA and the like.

There IP telephony is very inexpensive, yes, sometimes even free of charge, it has become a very serious one Competition for conventional Become telephony.

It are already inexpensive voice over internet protocol phones the market connected to an existing network or internet connection can be operated.

It are also so-called analog telephony adapters (ATA), which are an IP network (for example internet) with an analogue telephone connection, so that you have a conventional one can connect an analog telephone to IP telephony. This analog telephony adapter (ATA) are already available very inexpensively.

Either with the Voice over Internet protocol phones as well as with the analog phones via one Analog phone adapters can be used to make calls on the Internet and / or lead on the intranet.

Would you like to make a call with a second "IP phone", so there are no call costs when using a flat rate. The disadvantage is that the remote station is also an "IP phone" or a comparable one Software solution a PC, PDA or similar must have.

Some Internet providers now offer affordable gateway solutions who avoid this disadvantage. You assign a number to the "IP telephones" and provide a gateway to the regular telephone network. In order to such an "IP phone" can be quite a Dial normal phone number and will about the gateway service of the provider connected to any telephone connection worldwide. There are even talks possible in the mobile network. Conversely, the same providers also offer the choice from the normal Telephone and / or Mobile network via your gateway into the Internet to the "IP telephones". The tariffs of these Providers are in some cases significantly lower than those of normal telephone network operators.

The disadvantage of all these simple solutions is that you can use such devices very cheaply or even free of charge, but the infrastructure of a telecommunications system cannot be used. That is, if you are called on the "IP telephone", you have to go to the location of the "IP telephone" to answer the call. If you want to make outgoing calls yourself, you also have to go to the location of the "IP telephone". If you use a simple analog telephony adapter (ATA), the situation is the same. There is now also analog telephony -Adapters (ATA), which have several analogue connections. Here it is then possible to distribute the connected telephones in the house in order to be accessible everywhere. Also possible are digital telephony adapters (DTA), which replace the analogue interface ( n) have digital interfaces, such as S ₀ or U _p0 .

A However, there is no connection to a telecommunications infrastructure In any case.

telecommunications systems have to however, is expected to be expensive to remodel with appropriate Software adjustments under certain circumstances also a possibility for the Make calls over the To create internet. Whether and how this should be done is still unclear. On in any case it is problematic and would change too the protocols of the providers immediately to further labor-intensive and making expensive changes have to lead.

It exists against that an interest in a cheaper one and still functionally better way to find conversation connections to establish between the Internet and a telephone, this one Phone support should have a telecommunications system.

This object is achieved according to the invention by a circuit arrangement for establishing a call connection between the Internet and a telecommunications system, with a first interface, which is adapted for connection to a terminal-side output of a telecommunications system, with a second interface, for connection to a terminal-side output of an Internet -Telephone adapter is customized with egg ner call recognition device, which recognizes that a call is coming in at one of the two interfaces, with a control device which, in the case of a call recognized by the call recognition device, establishes a connection to the respective other interface at one of the interfaces and the call via this other interface to produce a Call connection forwarded, with a call end detection device that recognizes the end of the call connection and informs the control device so that it clears the call connection.

In order to will be surprising solved the problem. While all approaches so far assumed that appropriate adapters between a telecommunications system and the Internet must be set, i.e. from the telephone network or Internet viewed on the entry side of a telecommunications system, According to the invention, that is exactly what happens Opposite.

The circuit arrangement according to the invention is equipped that they are connected to a device Connection of the telecommunication system and also on the terminal side Internet telephone adapter (ATA or DTA) output connected can be.

In order to allows the circuit arrangement according to the invention the integration of telephony through the Internet protocol in the simplest way with any conventional and not converted or programmed with new software telecommunications system. To have to practically only one connection of the circuit arrangement with a simple one Analog or digital output of the telecommunications system connected and the other connection with the analog or digital port of an Internet or telephone adapter. That is practically already the connection of the telephony over the Internet protocol (IP telephony) with the telecommunications infrastructure manufactured.

Thereby can much more complex possible solutions replaced be, for example, a port of the telecommunications system connect to the internet or intranet. The effort for one Ethernet port is saved as well as that for a powerful microcontroller for implementation of the protocols and the adaptation of the protocols if the provider them as usual change frequently.

It there is a much improved functionality too much cheaper Manufacturing and installation costs and also a relative one easy to see connection, which is correspondingly easy to install and, if necessary, easy to replace.

The Circuit arrangement can in particular have a coupling stage. This coupling stage lies between the first interface and the second interface. It can make the mediations.

This Coupling stage or this coupling point can also be various others Separate elements of the circuit arrangement. For example the hang-up detection device be in two parts and constructed in this way be that a subarea hanging up the interlocutor recognizes on the part of the telecommunications system, during the other part of hanging up the conversation partner on the website recognizes. A link via a crosspoint is also possible here.

As first interface and / or as second interface can in particular Radio interfaces are used. It can be, for example DECT, Bluetooth, GSM, UMTS or other forms of radio interfaces act.

As very useful option the first interface has already been found in tests equip and adapt the circuit arrangement so that it to the so-called doorphone interface output the telecommunications system is connected. This door phone interface output the telecommunications system has a number of properties as standard, the just for the call connection envisaged here is cheap, For example, connectivity to multiple devices that are connected the telecommunications system are connected, etc. Of course they are but also other end devices connections conceivable.

The call connection can in particular about a holding circuit device can be made. Holding circuit means are proven in another context. You prove the required and corresponding interfaces and technically maintain the conversation.

Also this holding circuit device can be constructed in two parts and through the mentioned coupling stage or the crosspoint must be separated.

It is also possible to provide configuration memories or internal memories in or on the control unit. These memories can be used to save destination numbers or to record useful configuration parameters. Least-cost routing functionalities can also be organized so well in order to establish the most cost-effective call connection at any given time. Called numbers and / or the associated call data can also be saved in the same way Always note which Voice over Internet Protocol (VoIP) calls were made, since these are not readily apparent to the telecommunication system, since from the point of view of the telecommunication system they appear as an internal conversation between two end devices.

With Such a circuit device can be a variety of other additional possibilities for the Users are created.

So the circuit arrangement can have a device which calls a special number in the telecommunications system, to determine if it is already one of the circuitry known telecommunications system. This can make it special functionalities (Features) offer specifically on this telecommunications system or are coordinated with this type of telecommunications system. These functionalities can both in an expansion and in a reduction of the standard range of functions consist.

It is possible, too, by calling a special number in the telecommunications system determine if it has been one of the circuitry so far unknown telecommunications system. Then one can predetermined behavior performed a change, for example across from the standard behavior or an attitude of regular operation.

in the The following are several exemplary embodiments with reference to the drawings the invention closer explained. Show it:

1 is a schematic representation of the basic structure according to the invention;

2 a detailed connection diagram of another embodiment according to the invention; and

3 a possible internal structure with a block diagram for a circuit arrangement according to an embodiment of the invention.

1 shows the basic structure with a circuit arrangement installed in a corresponding environment.

Basically, a telephone network is shown 1 and access to the internet 2 , which could also be an intranet.

On the left you can see that a conventional telecommunications system 14 on the telephone network 1 is connected, here as an example twice, on the one hand via an ISDN connection and on the other hand via an analog connection (a / b). Of course, the telecommunications system 14 also be connected to the telephone network via further lines. As in the following, this is only a basic illustration.

In addition to these connections of the telecommunication system on the telephone network side 14 connections are provided on the other side of the terminal. These lead to digital devices 16 , for example to an ISDN telephone, to a personal computer (PC), to a fax machine, and so on.

There are also analog devices 17 provided, for example analog telephones or an analog modem or an analog connected fax machine.

The telecommunication system 14 is conventional and unchanged and not adapted to the invention.

The Internet is on the right side of the illustration 2 , Connected to this is an example of a telephone set that is specifically tailored to the Internet protocol. These phones cannot be used for other purposes.

Here, however, one is also interested in the Internet 2 connected Internet telephone adapter 15 , From such Internet telephone adapters 15 There are different types, on the one hand so-called analog telephony adapter (ATA) or digital telephony adapter (DTA). In the example shown, it is an analog telephony adapter (ATA), which is used as an Internet telephone adapter 15 is used. It therefore has at least two analog connections a / b shown. A conventional analog telephone is shown in an exemplary manner at one of these two connections. A telephone call could be made from this analog telephone in accordance with the Internet protocol, but one would be restricted to the use of this analog telephone and its functionalities.

Even the Internet telephony adapter 15 is not adapted to the invention, a device on the market can be used.

A circuit arrangement is now shown as a block 18 , This circuit arrangement 18 has an interface 28 , which is adapted so that it is connected to a terminal-side output of a telecommunications system 14 can be connected. In the exemplary embodiment shown, it is therefore an analog interface that is connected to one of the terminal-side analog outputs of the Te lekommunikationsanlage 14 can be connected.

The circuit arrangement 18 also has a second interface 29 , This interface 29 is adapted so that it is connected to an end of an Internet telephone adapter 15 can be connected. In the illustrated embodiment, the circuit arrangement 18 to an analogue output of an Internet telephone adapter 15 be connected so that the second interface 29 is designed as an analog connection.

The arrangement shown seems somewhat unusual. Usually goes the specialist assumes that incoming calls are always at the entrance or on one of the external or network connections and trained entrances or connections a telecommunication system or if they come from the Internet, at the Internet entrance of an Internet telephone adapter accrues.

This lights up too. Incoming calls are always on the Input of a device guided.

Exactly none of this can be seen in the figure, and that is exactly what the invention also corresponds to. The circuit arrangement 18 is adapted so that it does not go to the inputs, but unexpectedly to the terminal-side outputs of a telecommunications system 14 on the one hand and an Internet telephone adapter 15 on the other hand, can and should be connected.

The circuit arrangement 18 also takes from the perspective of the telecommunications system 14 the position of a terminal similar to that of the terminal 16 or 17 on. The same applies to the Internet telephone adapter 15 ,

If you now look at a call setup, this is briefly as follows: If the call comes from the Internet 2 , ie as a so-called "Voice over Internet Protocol (VoIP)" call, this call is made via the Internet telephone adapter 15 implemented and from there fictitiously reaches the circuit arrangement as a terminal 18 or the interface there 29 , From the perspective of the Internet or the Internet telephone adapter 15 the end device is also reached.

The circuit arrangement 18 itself recognizes one at the second interface 29 pending call, connects this to the first interface 28 and from there to the telecommunications system 14 , How this happens is explained in more detail in the following figures.

From the perspective of the telecommunications system 14 however, a terminal connected to the extreme right analog output is now trying to make a normal internal call to one of the other terminals 16 . 17 respectively. Where the call originally came from is for the telecommunications system 14 neither interesting nor obvious. The circuit arrangement 18 the full functionality of the telecommunication system can now be used as a "terminal" 14 For example, use a company and put the call through to a specified or any other participant, forward it, etc.

The reverse is also true. If one of the participants would like to use another terminal on the telecommunications system 14 have a conversation over the internet protocol, so to speak he dials in-house the terminal device that is used for the circuit arrangement 18 leads. The telecommunication system 14 mediates the conversation according to the circuit arrangement 18 ,

The circuit arrangement 18 recognizes at their first interface 28 that a call from the direction of the telecommunications system 14 comes. It takes this call and connects it to the second interface 29 ; the details will be discussed in connection with the following figures. The second interface 29 takes this call as its own call and passes it on to the connected Internet telephone adater 15 further. From the point of view of the Internet telephone adapter 15 is a call from the terminal connected to it 18 ; the original origin of the call is not apparent to him and is also of no interest.

The Internet phone adapter 15 consequently transfers this call as well as that of the other connected analog telephone to the Internet, for example 2 , so that the original subscriber on the terminal of the telecommunications system 14 now a phone call over the Internet 2 a voice over internet protocol (VoIP).

The telecommunications system in the company does not have to be manipulated or changed in order to be suitable for calls over the Internet (VoIP). It is also not necessary to convert the Internet telephone adapter in any form. It is sufficient to connect the circuit arrangement according to the invention like a terminal to the telecommunication system and the Internet telephone adapter in order to obtain this full possibility. Conversely, the hitherto relatively problematic and less comfortable calls over the Internet can be made with the full convenience of a telecommunications system that a company already has may have designed according to his wish.

It should also be borne in mind that these phone calls do not only have to be voice messages, i.e. conventional telephone calls. You can also from a terminal of the telecommunications system 14 be carried out from, for example, a fax machine or a PC, so that the call connections can also be fax transmissions or data transmissions. Images or videos or sound and music files can of course also be transmitted. The same possibilities exist in the other direction; Data, video, audio, fax, etc. can also be fed into a company's telecommunications system from the Internet.

The following is based on the 2 a possible, concrete structure is shown as a connection diagram. It is also specified that the telecommunications system 14 and the internet phone adapter 15 can be embedded in a more complex system and that cross-connections are also possible, as is often the case in reality. However, this does not change the possibilities of the circuit arrangement 18 which becomes a kind of VoIP adapter.

In addition to the elements of 1 is a splinter, for example 11 drawn in, which separates the actual telephoning via ISDN or analog (a / b) lines from a method according to DSL. The splinter 11 is via a so-called NTBA (Network Termination Basic Access) with the telecommunication system 14 connected. A so-called UK ₀ interface with Basic Access is also shown as the interface between the splitter 11 and the NTBA 12 ,

The NTBA 12 is through a So interface 23 for basic access with the telecommunications system 14 coupled.

There is also an analog (a / b) interface 24 for an analog exchange connection between the splitter 11 and the telecommunications system 14 intended.

In principle, there would also be a direct connection 20 from the telephone network 1 to the telecommunications system 14 bypassing the or without the splinter 11 into consideration.

In the version with splitter 11 is a DSL interface 22 provided, for example ADSL, SDSL or TDSL. This interface leads to a DSL modem 13 , which can also be equipped with a router, a switch, a firewall, etc. This DSL modem 13 has, for example, an Ethernet connection 25 who the DSL modem 13 with the internet phone adapter 15 combines.

An Internet connection can also be used 25 from the Internet phone adapter 15 directly on the Internet 2 or lead into the Inteanet.

The Internet phone adapter 15 can be, for example, an analog telephony adapter (ATA) or a digital telephony adapter (DTA).

To the telecommunication system 14 are here in this embodiment via S ₀ , U _p0 interfaces or an S ₀ bus 26 corresponding digital devices 16 connected, in the illustrated embodiment, two digital terminals 16 , such as ISDN telephones.

A third device 17 is an analog device that has an a / b interface 27 with the telecommunication system 14 connected is. Another analog interface would also be possible.

A fourth terminal-side output of the telecommunications system 14 can be either a digital or an analog output, it leads to a corresponding digital or analog interface 28 in the circuit arrangement 18 , ie the VoIP adapter according to the invention.

It is also shown that a direct connection 20 from the telephone network 1 to the circuit arrangement 18 performs what is possible but not absolutely necessary.

Finally, the circuit arrangement 18 over the second interface 29 with the internet phone adapter 15 connected.

3 finally shows a block diagram of a circuit arrangement 18 in detail. The core is again the first interface 28 on the left and the second interface 29 on the right-hand side, which are designed analog or digital depending on the desired connection and to the telecommunications system 14 (if necessary to the telephone network 1 ) on the one hand and to the Internet telephone adapter 15 on the other hand lead.

As you can see, introduces one of these two interfaces 28 . 29 incoming call to various reactions of certain elements within the circuit arrangement 18 , Not all elements shown in the block diagram are absolutely necessary. The easiest way to do this is to use the following description of the functional sequence of an incoming call from the Internet 2 , an outgoing call from the telecommunication system 14 and at the equally important end of a conversation.

One gets out of the internet 2 called, the analog telephony adapter (ATA) 15 the circuit arrangement 18 on. A caller ID 40 in the circuit arrangement 18 recognize this. With a hold circuit 33 occupies the circuit arrangement 18 an analog port of the telecommunications system 14 , With a DTMF generator 35 or by pulse selection via the hold circuit 33 calls the circuitry 18 a preset number in the telecommunications system 14 on. Knows the telecommunications system 14 the circuit arrangement 18 , a simple line assignment is sufficient for the telecommunications system 14 then internally selects the correct interlocutor (e.g. 16, 17). In many telecommunications systems 14 there is the so-called baby / senior call, which automatically dials and calls a preprogrammable number when the line is seized.

After a predetermined period of time or if through a decrease detection 36 If it is recognized that a subscriber answers, the hold circuit 43 to the Internet telephone adapter 15 switched on and a coupling stage 50 puts the speech path between 28 and 29 ago. The conversation between the participants in the telecommunications system 14 and the participant on the Internet 2 or Inteanet exists.

The Internet telephone adapter transmits 15 the caller's calling number, this can be identified using an optional caller ID (CLIP) 42 from the circuit arrangement 18 be recognized. It can then do this using a DTMF generator 34 or by pulse selection via the hold circuit 33 or in any other agreed manner to the telecommunications system 14 to transfer. It can then display this to the called subscriber in the telecommunications system.

The reverse is true for incoming calls from the telecommunications system:
Would like a participant on a terminal 16 . 17 or from the telephone network 1 from the telecommunications system 14 a conversation on the internet 2 or intranet, that is what the telecommunications system calls 14 the circuit arrangement 18 via the analog line to the interface 28 on. The circuit arrangement 18 recognizes the call and immediately switches a second hold circuit 43 to the Internet telephone adapter 15 on. After a time or after the dial tone has been recognized by means of a dial tone recognition 47 occupies the circuit arrangement 18 the line to the telecommunications system 14 by means of the hold circuit 33 and switches the speech path with the coupling stage 50 by. Now the destination number can be dialed from the telecommunications system using DTMF signals. The Internet telephone adapter can provide this dialing information 15 recognize directly. The subscriber within the telecommunications system 14 recognizes from the in the Internet telephone adapter 15 generated tones whether his interlocutor can be reached. The conversation partner reports on the Internet 2 or Inteanet, the call is switched through.

Is the internet phone adapter 15 prepared for this, from the analog output or from the interface 29 from receiving information, so could be an outgoing call number from the telecommunications system 14 about the circuit arrangement 18 to the Internet phone adapter 15 be transmitted. The conversation partner on the Internet could recognize who is calling him. The Internet phone adapter is currently generating 15 or the provider's phone number server and the phone number of the calling party and reports this to the called party.

The call could end as follows:
In order to end the call again, the circuit arrangement 18 recognize whether one or both parties have hung up. For this is a call end recognition device 31 . 41 provided that in the illustrated embodiment, the two hangup identifications 31 and 41 having. Detects the circuit arrangement 18 that the call was ended, he switches both hold circuits 33 . 43 and the coupling stage 50 from. Now he is ready to accept a new call for another call.

The following variants are not shown in the figures, but are also possible: With the Internet telephony adapter 15 can also be a multi-channel device with multiple analog interfaces 29 or digital interfaces 29 act.

The analog telephony adapter 15 can also replace other interfaces as a replacement for the analog a / b interface 29 have, for example an S ₀ or U _p0 interface, such as the Digital Telephony Adapter (DTA) presented here 15 ,

The analog telephony adapter (or digital telephony adapter) 15 can go to the internet / intranet site 2 other interfaces too 25 own, for example DSL or others.

The analog phone adapter 15 can also contain other functional units, for example a DSL modem 13 , a switch 13 , a router 13 , a firewall 13 Etc.

The circuit arrangement 18 can contain a configuration memory in which one of the telecommunications systems 14 known reputation number is located. This memory can be from the telecommunication system 14 For example, can be programmed via DTMF signals or by means of one or more keys on the circuit arrangement 18 self.

Further uses of the circuit arrangement according to the invention 18 are also possible.

The circuit arrangement 18 can be used in an automatically working system, which by itself calls between telephone connection / telephone network 1 and the internet / intranet 2 mediated automatically on one or both sides. This results in gateway functionality between the networks.

1

Telephone network, telephone line

2

Internet- or intranet connection

11

splitter, that separates the telephony from the DSL

12

NT (Network Termination Basic Access)

13

DSL modem, possibly with router, switch, firewall etc.

14

telecommunications system (Telecommunications system)

15

Internet telephone adapter e.g. analog telephony adapter (ATA)

16

digital terminal for example ISDN terminal such as ISDN

Phone, PC, FAX, etc.

17

analog terminal such as analog phone, analog modem, FAX,

Etc.

18

circuitry

21

UK ₀ interface for Basic Access or a comparable interface

22

DSL interface, for example ADSL, SDSL, TDSL

23

So interface with Basic Access or a comparable interface

24

a / b interface with analog exchange connection

25

Ethernet connection between DSL modem, Internet / intranet and analog

Telephony Adapter

26

S ₀ , U _p0 interface or another digital interface of the

Telecommunications system, to digital devices

27

a / b interface or another analog interface of the

Telecommunications system, to analog devices

28

first Interface of the circuit arrangement, for telecommunications

investment

29

second Interface of the circuit arrangement, for telecommunications

investment

30

call recognition of calls from the telecommunications system

31

Auflegeerkennung, to determine if the interlocutor on the telephoto

communications system has hung up

32

Caller Line Identification to recognize which participant the

Telecommunications system triggers the call (to Example CLIP orken

voltage)

33

Hold circuit, to bele the management of the telecommunications system

gene, but also suitable for generating pulse dialing information

34

DTMF detection, for information from the telecommunications system

to detect

35

DTMF generator, for election information to the telecommunication an

location to create

36

Answer ID to recognize when the called party

the Accepted the call.

37

dial tone, to recognize when the telecommunications an

location is willing to accept election information

40

call recognition of calls from the Internet telephone adapter

41

Auflegeerkennung, to determine if the interlocutor on the internet

phone adapter has hung up

42

Caller Line Identification to recognize which participant from the

/ Nteanet Internet triggers the call (for example CLIP detection)

43

Hold circuit, to seize the line of the Internet telephone adapter,

but also suitable for generating pulse dialing information

44

DTMF detection, to get information from the internet phone adapter

detect

45

DTMF generator, for dialing information to the Internet telephone adapter

to produce

46

Answer ID to recognize when the called party

the Accepted the call.

47

dial tone, to recognize when the internet phone adapter

ready election information is to be accepted

50

Switching stage; to talk or data information

turn on

51

control unit from a microcontroller system or a logic circuit,

how a CPLD, FPGA etc.

52

 Configuration memory, for example to call the numbers of the

Telecommunications system save. It can also be a component

of Be 51

53

Power supply unit optionally for external power supply or

power supply from one or both a / b connections or both ausa / b connections, as well as externally.

Claims (22)

Circuit arrangement ( 18 ) to establish a connection between the Internet ( 2 ) and a telephone, with a first interface ( 28 ), which is used to connect to a terminal-side output of a telecommunications system ( 14 ) is adapted with a second interface ( 29 ) for connection to an end of an internet telephone adapter ( 15 ) is adapted with a call recognition device ( 30 . 40 ), which recognizes that at one of the two interfaces ( 28 . 29 ) a call comes in with a control device ( 51 ), which at one of the call recognition devices ( 30 . 40 ) recognized call at one of the interfaces ( 28 . 29 ) a connection to the other interface ( 29 . 28 ) and the call via this other interface ( 29 . 28 ) forwarded for establishing a call connection, with a call end recognition device ( 31 . 41 ), which recognizes the end of the call and the control device ( 51 ) informed, so that this clears the call. Circuit arrangement according to claim 1, characterized in that the first interface ( 28 ) is a radio interface. Circuit arrangement according to claim 1 or 2, characterized in that the second interface ( 29 ) is a radio interface. Circuit arrangement according to one of the preceding claims, characterized in that the first interface ( 28 ) for connection to a door intercom output of the telecommunication system ( 14 ) is adjusted. Circuit arrangement according to one of the preceding claims, characterized in that a holding circuit device ( 33 . 43 ) is provided, the assignments of the respective interfaces ( 28 . 29 ) for the call connection. Circuit arrangement according to one of the preceding claims, characterized in that the control device ( 51 ) a configuration memory ( 52 ) for storing configuration parameters and / or destination numbers. Circuit arrangement according to claim 6, characterized in that the configuration memory ( 52 ) has a storage functionality for least-cost routing. Circuit arrangement according to one of the preceding claims, characterized in that a call number recognition device ( 32 . 42 ) that is provided by the first interface ( 28 ) and / or the second interface ( 29 ) the caller's number is fed. Circuit arrangement according to one of the preceding claims, characterized in that a coupling stage ( 50 ) between the first interface ( 28 ) and the second interface ( 29 ) is provided. Circuit arrangement according to claim 9, characterized in that the coupling stage ( 50 ) has signal amplification in one or both directions of conversation. Circuit arrangement according to one of the preceding claims, characterized in that the control device ( 51 ) has a password circuit to offer user-dependent switching options. Circuit arrangement according to one of the preceding claims, characterized in that the first interface ( 28 ) and / or the second interface ( 29 ) are multi-channel or have several independent individual interfaces that have more than one call connection through the circuit arrangement ( 18 ) at the same time. Circuit arrangement according to one of the preceding claims, characterized in that the control device ( 51 ) is designed so that it functions as a gateway between the telephone network ( 1 ) and the Internet ( 2 ) or the intranet with optional use of the telecommunications system ( 14 ) or the Internet telephone adapter ( 15 ) allows. Circuit arrangement according to one of the preceding claims, characterized in that one or more DTMF detection devices ( 34 . 44 ) are intended to hold election information. Circuit arrangement according to claim 14, there characterized in that the DTMF recognition device ( 34 . 44 ) also manages programming information. Circuit arrangement according to one of the preceding claims, characterized in that one or more DTMF generator devices ( 35 . 45 ) are provided, the signals via the first interface ( 28 ) or the second interface ( 29 ) can pass on. Circuit arrangement according to one of the preceding claims, characterized in that an acceptance detection device ( 36 . 46 ) is provided, which is based on the first interface ( 28 ) and / or the second interface ( 29 ) recognizes whether the respective conversation partner has answered. Circuit arrangement according to one of the preceding claims, characterized in that a dial tone detection device ( 37 . 47 ) is provided, which is based on the first interface ( 28 ) or the second interface ( 29 ) detects whether the telecommunications system ( 14 ) and / or the Internet telephone adapter ( 15 ) Can accept election information. Circuit arrangement according to one of the preceding claims, characterized in that a power supply unit ( 53 ) is provided, which can be connected to an external voltage source. Circuit arrangement according to claim 19, characterized in that the power supply unit ( 53 ) with the first interface ( 28 ) and / or the second interface ( 29 ) is connected and a power supply via one or both of the interfaces ( 28 . 29 ) and / or an external voltage source. Circuit arrangement according to one of the preceding claims, characterized in that the call detection device ( 30 . 40 ) and / or the call end recognition device ( 31 . 41 ) and / or the phone number recognition device ( 32 and or 42 ) and / or dial tone detection device ( 37 . 47 ) are each built in two parts, and that the coupling stage ( 50 ) is arranged between the two elements of these devices. Circuit arrangement according to one of the preceding claims, characterized in that the control device ( 51 ) has a further memory for called numbers and / or associated call data.