DE102009051965A1 - Method for producing communication connection between ISDN terminal and switching center, involves receiving call information for connection establishment, characteristics of private network and/or status information by access device - Google Patents

Abstract

The method involves sending setup information from a network access device (1a) to another network access device (1b) by user-to-user signaling 1 (UUS1) and/or sub-addressing messages. The information are related to information about a requested carrier service, private network numbers of associated ISDNterminal (3a) and switching center (3b), characteristics of a virtual private network (VPN) and/or status information about subscriber-sided connection. Call information for connection establishment, the characteristics and/or status information are received by the later device. An independent claim is also included for a communication system comprising network access devices.

Description

The The invention relates to a method for using a network of third parties for a remote from a private network (VPN) participants to establish a communication connection in the VPN network, a network access device for an ISDN landline with UUS1 service and / or subaddressing service to implement the method, as well as a communication system that at least one ISDN landline, a first network access device and a second network access device comprises.

Communication systems comprising a public ISDN landline are well known. Such a communication system, see 1 , includes in addition to the ISDN landline 22 , a variety of basic connections 24 , which are designed as S0 interfaces. To a base connection 24 can each be a subscriber connect, for example, an ISDN terminal 25 or an exchange 26 , in particular a private network (PBX) exchange. About the landline 22 can connect between the two participants 25 and 26 be prepared so that the two participants 25 . 26 can communicate with each other. If the subscriber is not a terminal 25 but an exchange 26 , the connection is established by a subscriber connected to the exchange, which may be a terminal or in turn a switching center, with the subscriber 25 via the exchange 26 , In this way, for example, a communication between participants of a private network and remote participants that are not integrated in the private network, at least on the public landline 22 without losing or changing the original information.

In An ISDN communication system will initially be over a D-channel signaling information between the involved Exchanged devices. This signaling information include setup messages, connect messages, disconnect messages in particular and acknowledge messages associated with said messages.

to Connection of a remote from a private network subscriber of a Voice or data network is known by the subscriber to the private network private features to be transmitted through ISDN dial-up connections tunnel through the public landline. This tunneling is via a built-B channel, d. H. above the traffic channel, carried out. The disadvantage of this is the Loss of time that arises because, for example, for the transfer of private features first the B-channel in public Fixed network must be established.

Of the UUS1 service is an ISDN service that makes it possible in the limited scope of data as part of a setup message, a connect message, and / or transmit and / or receive a disconnect message. The information obtained in this way from the network access device are sent to the other network access device, before a B channel was established. Correspondingly from the further network access device data to the first network access device via sent the ISDN landline and from the first network access device are received before a B-channel is established.

The Subaddressing is an ISDN or GSM feature that has a Extension of the addressing capacity over the ISDN number addition. In subaddressing can when establishing a connection in the context of a subaddressing message additional information from the caller to the recipient be transferred when establishing a connection with. Because the network does not handle the subaddressing message transparently, This message can be freely designed.

At the Operate communication networks, it happens that participants a private network are not directly connected can, so over an intervening network a connection must be made. If between a remote Participants and the private network high availability the connection is required and possible without long Waiting data is to be transmitted, the remote Participants with a permanent connection to the intermediate Network connected to the private network. This is correspondingly expensive. A much cheaper option is the Connection via the intermediary network only if necessary, over one Establish dial-up connection. So that's not worth mentioning Power losses compared to the leased line there must a fast connection via the intermediate network and ensures high availability of the established connection be. Blocking the dialing connection should be as possible be avoided. At the same time have all the features of the VPN network.

The DE 10034319 A1 describes an Internet telephone system wherein the predetermined telephone number, the subscriber identification number and the password for an Internet connection are transmitted from a caller side ISDN terminal adapter to a destination side ISDN terminal adapter by means of a UUS message or in a subaddress of the call setup. The destination-side ISDN terminal adapter then connects to the access point of the destination-side provider. The determined IP addresses then become an Internet telephone connection made.

aid However, this method does not allow that a remote participant of a private network via a Network of third parties in a VPN network while maintaining all features to other VPN participants as fast and secure as possible is taught.

From the DE 10257966 A1 It is known how to use user-to-user signaling auxiliary services to establish a connection from a telecommunication terminal to a data store using an ISDN DSS1 protocol between the telecommunication terminal and a switch, and the switch to access the data storage taught. By means of this method and the associated device, call number-related data present in the data storage can be remotely configured. A disadvantage of this method is that it takes too long to set up the connection in order to be able to use it for a leased line-equivalent connection between a remote VPN subscriber and the VPN network via an ISDN network stored therebetween. In addition, the method is not usable for communication between remote VPN subscribers.

task the present invention is to provide a method with it within the shortest possible time possible is between a remote VPN participant and a VPN network, while retaining all VPN features, over one existing public network structure a communication link to accomplish. Furthermore, a communication system is to be provided which allows information, especially private Performance characteristics, within a dial-up connection in short To transfer time via an ISDN landline. A Another object of the invention is a network access device to create by means of which such a communication system made can be.

These Tasks are achieved by the method according to the invention, a network access device and a communication system according to the solved independent claims.

advantageous Developments are objects of the dependent Claims.

through A UUS1 message can be setup information and private Performance features are transmitted. this makes possible an accelerated connection between one of the private network remote subscriber and a subscriber within the private network the ISDN landline in the context of a dial-up connection. For example may transmit one of the remote subscriber to the first network access device Setup message via a UUS1 message to the others Network access device transmitted in the context of the connection setup and this setup message for an expedited Establishment of a connection between the further network access device and the subscriber network connected to the other network access device Participants are used.

The transfer of status information allows, for example, in Framework of connection setup to detect failures quickly and, if possible, initiate countermeasures, for example, a rerouting.

In Similarly, it is also possible to use a subadressing service such information under a Subaddressing message to transfer.

The Inventive method according to claim 1 a communication link between one of a private Network (VPN) remote subscriber and another, to the VPN network Connected participants over an ISDN landline ago. That is, the two participants of the VPN network will be not directly connected within the VPN network, but over one intervening ISDN landline. The ISDN network offers UUS1 service and / or subaddressing service. To over the ISDN net a fastest possible communication connection to a VPN without sacrificing the features of the VPN network, it is necessary, next to the phone numbers of the caller and the called party additional features of the private network and information about to exchange the requested carrier services. This must be so happened that the connection as little as possible Time is taken.

at a connection established by the remote VPN participant whose network access device is initiated by this Network access device by means of a UUS1 message and / or a Subaddress message, as part of a setup message, a connect message, and / or a disconnect message over the ISDN landline transmitted to at least one other network access device. From this further network access device, the setup information forwarded to a subscriber connected participants.

According to the setup information concerning information about the requested carrier services, a private network number of the remote subscriber 3a , (Calling-1), a private network number a subscriber within the private network (Called_1), features of a private network or status information about the subscriber-side connection. Conversely, the first network access device receives call information for establishing a connection, features of the private network and / or status information about the subscriber-side connection from the at least one further network access device.

by virtue of This procedure is all for establishing a connection required data exchanged between participants so quickly the connection is established within a very short time. A user does not notice a significant difference between the Realization of his connection via a leased line or the method of the invention.

• – die erste Netzzugangsvorrichtung ersetzt die gewählte Nummer, „Called_1”, mit der Nummer der mindestens einen weiteren Netzzugangsvorrichtung, „Called_2”,
• – die erste Netzzugangsvorrichtung ersetzt in der Calling Number die Nummer des rufenden Teilnehmers, „Calling_1”, mit der Nummer der ersten Netzzugangsvorrichtung, „Calling_2”,
• – die erste Netzzugangsvorrichtung verpackt die Informationen „Calling_1”, „Called_1”, UUS1_1, MLPP_1 und eventuell weitere Protokollelemente in eine UUS1-Nachricht UUS1_2,
• – die erste Netzzugangsvorrichtung wählt über eine Wählverbindung über das Festnetz die mindestens eine weitere Netzzugangsvorrichtung an,
• – die erste Netzzugangsvorrichtung übermittelt im Rahmen des Verbindungsaufbaus mittels der in der UUS1_2 verpackten Setup-Nachricht die vom abgesetzten Teilnehmer stammenden Informationen an die mindestens eine weitere Netzzugangsvorrichtung,
• – die mindestens eine weitere Netzzugangsvorrichtung ersetzt nach Erhalt der Setup-Nachricht in der Called Number die eigene Nummer, „Called_2”, mit der gewählten Nummer, „Called_1”,
• – die mindestens eine weitere Netzzugangsvorrichtung ersetzt in der Calling Number die Nummer der ersten Netzzugangsvorrichtung, „Calling_2”, mit der Nummer des abgesetzten Teilnehmers, „Calling_1”,
• – die mindestens eine weitere Netzzugangsvorrichtung entpackt die über die UUS1_2 übermittelten Informationen „Calling_1”, „Called_1”, UUS1_1, MLPP_1 und eventuell weitere Protokollelemente,
• – die mindestens eine weitere Netzzugangsvorrichtung bildet auf Grundlage dieser Informationen die ursprüngliche vom abgesetzten Teilnehmer abgesendete Setup-Nachricht nach, und
• – die mindestens eine weitere Netzzugangsvorrichtung übermittelt diese nachgebildete Setup-Nachricht an den angewählten Teilnehmer im Privatnetz.

Claim 2 describes an advantageous embodiment of claim 1. The connection is established in the following steps:

• The first network access device replaces the dialed number, "Called_1", with the number of the at least one other network access device, "Called_2",
• The first network access device replaces in the calling number the number of the calling subscriber, "Calling_1", with the number of the first network access device, "Calling_2",
• The first network access device packages the information "Calling_1", "Called_1", UUS1_1, MLPP_1 and possibly further protocol elements in a UUS1 message UUS1_2,
• The first network access device dials the at least one further network access device via a landline telephone connection,
• The first network access device transmits the information originating from the remote subscriber to the at least one further network access device as part of the connection setup by means of the setup message packed in the UUS1_2
• The at least one further network access device replaces its own number, "Called_2", with the dialed number, "Called_1" after receiving the setup message in the called number
• The at least one further network access device replaces in the calling number the number of the first network access device, "Calling_2", with the number of the remote subscriber, "Calling_1",
• The at least one further network access device unpacks the information "Calling_1", "Called_1", UUS1_1, MLPP_1 transmitted via the UUS1_2 and possibly further protocol elements,
• - The at least one further network access device based on this information forms the original sent by the remote subscriber setup message, and
• - The at least one further network access device transmits this replicated setup message to the selected participants in the private network.

According to claim 3 provides the inventive method for the required availability of the connection. Therefor During rest periods, the availability of B-channels is cyclical checked. If one or more channels available are at least one traffic channel for a particular Time kept in stock and after this time not one used compound dismantled. If several user channels have been built up in stock, they are staggered dismantled one after the other.

So are almost always one or more channels for the desired connection already established before a remote subscriber requests a connection, which in addition contributes to a time saving in establishing a connection.

According to claim 4 is set up a backup function, so if a connection between a first network access device and one at a other network access device connected participants not can be constructed from the first network access device via a connection a third network access device to which the subscriber also connected is produced.

In Claim 5 is an advantageous embodiment of the method Claim 4 described. From the other network access device becomes after a futile attempt to establish connection with the Exchange via the fixed network to the first network access device sent a UUS1 message as part of a disconnect message. It contains information about the failure of the connection to the exchange. Thereupon will of the first Network access device enabled a backup routing by the from the first network access device connects to the third network access device is established and from there the connection to the participant over a second exchange is forwarded.

In claim 6, a further variant for a backup function is listed. Here offers an additional, fourth network access device to which a second subscriber to the private network is connected, which also still has a public number in the public fixed network, the possibility of activating a rerouting. For this purpose, the first network access device is set up with a list containing the public number of the fourth network access device. For the rerouting will be from the first Network Access Device the Called Number Called_1, which denotes the private network number of the second VPN subscriber, replaced by a number Called_2, which reproduces the public number of the fourth network access device. Thus, according to claim 6 via the public network backup possibility of the VPN.

The Claims 7 to 14 relate to a network access device to implement the method of the previous claims.

Provided according to the invention is a network access device for an ISDN landline with UUS1 service (User-to-User Signaling 1 service) and / or subaddressing service, wherein the network access device is arranged such that at establishing a connection via the ISDN landline between the network access device and another network access device Information transferable by means of a UUS1 message and / or subaddressing message and / or receivable.

The A communication system according to the invention 15 to 19 includes at least one ISDN landline, a first network access device and a second network access device, wherein the first network access device and second network access device in each case via a network-side Connection to the landline are connected for communication via the landline.

The The invention will be described below on the basis of exemplary embodiments, which are represented by a plurality of figures, explained in more detail. Showing:

1 a communication system according to the prior art,

2 a first communication system according to the invention with two network access devices according to the invention,

3 an illustration of a connection setup between a remote subscriber and a private network via a fixed network,

4 an illustration of a connection setup between a private network and a remote subscriber via a fixed network,

5 a second embodiment of a communication system including a representation of a connection setup between a subscriber and a private network,

6 A third embodiment of a communication system including a representation of a connection setup between a remote subscriber and a subscriber of a private network,

7 A fourth embodiment of a communication system including a representation of a connection setup between a subscriber of a private network and a remote subscriber,

8th a detailed account of the in 3 shown connection establishment between a remote subscriber and a private network, and

9 a detailed representation of a connection structure of in 5 shown connection establishment between an attached subscriber and a subscriber of a private network.

Same or corresponding elements are in the figures with the same Provided with reference numerals.

The 2 shows a first embodiment of a communication system according to the invention.

The communication system includes a landline 2 , a first network access device 1a and a second network access device 1b , as well as a first participant 3a and a second participant 3b , The landline 2 is a public ISDN telecommunications network with UUS1 service operated by a Subscriber Network Operator (TNB). The first network access device 1a and the second network access device 1b are with the landline 2 each connected via an S0 interface S0-1 or S0-2. The interfaces S0-1 and S0-2 are leased ISDN basic connections here at the TNB. For connection to the fixed network 2 via the basic connections S0-1 or S0-2, the first network access device 1a and the second network access device 1b each one ISDN NT port (Network Termination Port) on.

The first network access device has an ISDN TE port (Terminal Equipment Port), via which the subscribers via an S0 interface 3a connected. The second network access device 1b has a second ISDN NT port on to the via a S0 interface, the second participant 3b connected. Due to the ports, the first network access device 1a in the 2 as S0-BoxTE, the second network access device 1b referred to as S0-BoxNT.

The first participant 3a (Tln-1) is an ISDN terminal in this embodiment. The second participant 3b is through a private network with a private exchange PBX 3b educated. To the central office 3b are a variety of terminals or other exchanges on the private network closed, but in the 2 are not shown in detail.

The first network access device 1a and the second network access device 1b are set up so that when connecting via the ISDN landline 2 in the form of a dial-up connection between the first network access device 1a and the second network access device 1b Information can be transmitted and / or received by means of a UUS1 message.

The 3 shows a representation of a connection setup between the first participant dropped here 3a and the second participant 3b , here the exchange 3b of the private network. The remote participant 3a starts the connection with a setup message addressed to the S0-BoxTE. The setup message contains information about the requested bearer services (bearer service = BC), a private network number of the remote subscriber 3a , (Calling-1), a private network number of a subscriber within the private network (Called_1), and information about features of the private network, here information UUS1_1 and MLPP_1 (MLPP = Multi Level Precedence and Pre-emption). The S0-BoxTE 1a is set up in the call number of the setup message to call the dialed number Called_1 with the number of the S0-BoxNT 1b Called_2 replaced. Furthermore, the S0-BoxTE replaces 1a in the calling number the number of the first participant 3a Calling_1 with the number of the S0-BoxTE Calling_2. Furthermore, the S0-BoxTE packs 1a the information Calling_1, Called_1, UUS1_1, MLPP_1 and possibly further protocol elements in a UUS1 message UUS1_2.

Via a dialup connection, the S0-BoxTE chooses 1a over the landline 2 the S0-BoxNT 1b at. As part of the connection setup are packed by means of a setup message in the UUS1_2 message from the remote participants 3a derived information to the S0-BoxNT 1b transmitted.

The S0-BoxNT 1b is set up in such a way that, after receiving the setup message in the called number, it replaces its own number Called_2 with the dialed number Called_1. Furthermore, the S0-BoxNT in the calling number replaces the number of the S0-BoxTE Calling_2 with the number of the remote subscriber Calling_1. Furthermore, the S0-BoxNT unpacks the information transmitted via UUS1_2 Calling_1, Called_1, UUS1_1, MLPP_1 and possibly other protocol elements and forms based on this information, the original of the remote subscriber 3a sent Setup message after. This simulated setup message is sent to the PBX 3b of the private network.

The PBX 3b of the private network receives a setup message as sent by the remote party 3a was sent. By transferring this original setup message in the UUS1 between the S0-BoxTE 1a and the S0-BoxNT over the fixed net 2 Signaling in the first call setup message achieves fast call setup. The remote participant 3a sent setup message reaches the PBX 3b without a B-channel has been established.

The 4 shows an illustration of a connection setup between a private network subscriber and the remote subscriber 3a , On the representation of the participant of the private network was waived.

As part of the connection setup sends the PBX 3b to the S0-BoxNT 1b a setup message. The setup message contains information about the BC request (BC-Voice) the private network number of the remote subscriber 3a Calling_1 the number of the private network subscriber Called_1 and private network line characteristics UUS1_1, MLPP_1 and possibly further protocol elements.

The S0-BoxNT 1b is set up in such a way that, after receiving this setup message in the called number, it dials the dialed number Called_1 with the number of the S0 BoxTE 1a Called_2 replaced. Furthermore, the S0-Box replaces NT 1b in the calling number the number Calling_1 with the number of the S0-BoxNT Calling_2. Furthermore, the S0-BoxNT packs 1b the information Calling_1, Called_1, UUS1_1, MLPP_1 and possibly further protocol elements in a UUS1 message UUS1_2.

Via a dial-up connection via the landline 2 with the S0-BoxTE 1a will be sent to the S0-BoxTE 1a sent the thus-reshaped setup message including a UUS1 message. The S0-BoxTE 1a is set up to replace its own number Called_2 with the dialed number Called_1 after receiving the setup message in the called number. Furthermore, the S0-BoxTE in the calling number replaces the number of the S0-BoxNT Calling_2 with the number Calling_1. Furthermore, the S0-BoxTE unpacks from the UUS1 message UUS1_2 the elements Calling_1, Called_1, UUS1_1, MLPP_1 and any further protocol elements and forms from these the original one of the PBX 3b sent to the S0-BoxNT Setup message after. The thus emulated setup message is subsequently to the remote subscriber 3a sent.

The remote participant 3a it receives the setup as it is from the PBX 3b was sent. By transmitting this original setup message using a UUS1 message UUS1_2 via the landline 2 the connection establishment between a subscriber of the private network and the remote subscriber 3a significantly accelerated.

The correct replica of the original setup message determines the order and length of information items in the UUS1 message. For example, you can code the individual elements as "Element Type" and assign them a certain length. Such coding is advantageous if no connection between the S0 boxes 1a . 1b consists. For static connections, the original setup messages can be transmitted transparently through the tuned D channel. Preferably, the elements to be transmitted in the UUS1 message are transmitted with appropriate attributes, e.g. Type of Number, Numbering Plan ID, Presentation Indicator.

The network access devices 1a . 1b are set up with a network availability feature. The S0 boxes 1a . 1b check at rest, for example, when no calls are made or only a single B-channel is used, the availability of the fixed network 2 ie the availability of B-channels. For this are the S0 boxes 1a . 1b set up so that they call each other, without building an actual connection, ie a B-channel. As part of a connection setup between the S0 boxes 1a . 1b Checks whether a B-channel can be built up. If this is not the case, for example because no user channels are available or release causes are received, repeated attempts are made by means of repeated dialing to establish an actual connection, that is to say a user channel. If this was achieved, this traffic channel is maintained for a certain time. Likewise, the S0 boxes can 1a . 1b be set up so that they keep several user channels for a certain time in reserve. After this time, an unused connection is cleared down. Then the network availability is tested again. If several user channels have been set up "in stock", they can be reduced one after the other with a time delay. If, during the degradation of these links, a further network availability test proves that network availability is low, this will allow the remaining, on-hold, payload channels to be maintained.

A another possibility, the blocking probability Lowering is to apply for disaster benefits.

The 5 shows a second embodiment of a communication system. The second communication system is according to the in 2 However, constructed communication system shown, but additionally includes a third network access device 1c and a third participant 3c , The third network access device is according to the second access device 1b , So the S0-BoxNT-1 formed. The third network access device 1c is referred to in the following as S0-BoxNT-2. To the S0-BoxNT-2 the third participant is the participant 3c connected. The third participant 3c is formed here by a second exchange PBX-2 of the private network. The private network thus comprises two exchanges, namely PBXs 3b and PBX-2 3c , Participants within the private network (not shown) thus have two switching centers 3b . 3c to disposal.

In this embodiment, the network access device is 1a set up with a backup function. The backup feature is such that when connecting between the first network access device 1a and one at another network access device, here the S0-BoxNT 1b , connected participants, here PBX 3b , is not buildable, the network access device 1a establishing a connection via a third network access device, here the S0-BoxNT-2 to which the private network subscriber is also connected.

In this embodiment, no connection establishment between the S0-BoxNT 1b and the PBX 3b possible, for example because the PBX 3b has failed. Will now be part of a connection setup between the remote participants 3a and a subscriber to the private network tries to connect via the S0-BoxNT 1b and the PBX 3b to connect, the S0-BoxNT sends to the PBX after a failed connection 3b over the landline 2 to the S0-BoxTE 1a a disconnect message back. The S0-BoxNT 1b is set up to transmit a UUS1 message as part of the disconnect message, information about the failure of the connection to the PBX 3b contains, here the element "Act_Rerouting". The S0-BoxTE 1a is set up to enable backup routing upon receipt of the disconnect message including the UUS1 message. For this the S0-BoxTE starts 1a establishing a connection to the subscriber of the private network via the S0-BoxNT-2 1c and the second exchange PBX-2 3c and forwards the conversations about them.

Is the line again between the first S0-BoxNT 1b and the first exchange PBX 3b so send the S0-BoxNT 1b to the S0-BoxTE 1a as part of a setup message via a UUS1 message status information. After evaluating the status information, the S0-BoxTE deactivates 1a the rerouting. This is preferably done via an automatic selection of the S0-BoxTE 1a through the first S0-BoxNT 1b ,

The activation of the rerouting is preferably independent of a subscriber-initiated connection setup: as soon as the first S0-BoxNT fails the connection to the first PBX 3b Notices, it informs about an automatic selection of the S0-BoxTE here, as part of a built-in setup message UUS1 message containing the corresponding status information, such as the element Act_Rerouting.

The 6 showed a third embodiment of a communication system. The communication system is according to the first communication system, see 2 built up. On the presentation of the S0-BoxNT 1b was waived. In addition, the third communication system comprises a fourth network access device, here analogous to the S0-BoxTE 1a constructed second S0-BoxTE-2 1d , at the second participant 3d , here TLN-2 3d , connected. The second participant 3d is a member of the private network and also owns a public number in the public fixed network 2 ,

The S0-BoxTE 1a is set up with a backup function, which in case of a connection failure to the PBX 3b is activated. In this case, the activation can take place within the framework of a connection setup initiated by a subscriber or automatically in accordance with that in the context of the second communication device, see 5 described approach, for example, with an Act_Rerouting element packed in a UUS1 message within a Disconnect message from the S0-BoxNT 1b to the first S0-BoxTE 1a is sent.

The S0-BoxTE 1a is set up with a list containing the public number of the second S0-BoxTE-2 1d contains. For the rerouting, it replaces the Called Number Called_1, which designates the private network number of the second subscriber TLN-2, with a number Called_2, which is the public number of the S0 BOXTE-2 1d reproduces. The rest of the setup of the setup message is carried out according to the procedure described in the context of the first communication system. In particular, private network number Calling_1 of the subscriber 3a , Private network number Called_1 of the selected second party 3d and private-network-specific features are packed in a UUS1 message UUS1_Transit. The S0-BoxTE sends this setup message via the landline 2 to the S0-BoxTE-2 1d , The second S0-BoxTE-2 1d is set up to receive the original setup message from the first participant 3a to the first S0-BoxTE 1a has been sent is imitated. The original setup message is then sent to the second participant 3d sent. This preserves the features of the VPN network.

The 7 shows a fourth embodiment of a communication system according to the invention. The communication system is according to the first embodiment, see 2 formed, however, additionally contains a fifth additional device 1e , here is a backup S0-BoxNT-b 1e , and a third participant 3e , where the third participant 3e a plurality of terminals or one or more exchanges 3c can be. The S0-BoxNT-b 1e is thus not assigned to any particular ISDN connection.

The S0-BoxNT-b is set up in such a way that it assumes a backup function if, as part of establishing a connection between the subscriber 3e and the remote participant 3a it is detected that no connection between participants 3e and first PBX 3b or the S0-BoxNT-B 1b can be built. If this error, which lies within the private network, has been detected, then a rerouting within the private network via the backup box S0-BoxNT-b 1e activated. The connection establishment of the participant 3e of the private network with the remote subscriber 3a is analogous to that in the context of the first communication system, s. 4 , described procedure.

The 8th shows a detailed representation of the in 3 illustrated connection establishment between a remote subscriber 3a and a PBX 3b a private network. The in the 8th abbreviations used ITE, PTE, BNT and FNT stand for "ISDN side TE""Box TE side", "Box NT side" or "Festnetz NT".

In the context of the participant 3a initiated connection setup sends in a first step, the remote participants 3a , here an ISDN terminal a setup message to the S0-BoxTE 1a , The S0-BoxTE 1a packed by the participant 3a received Setup message in a UUS1 message. In a second step, the UUS1 message is sent to the fixed network as part of a setup message 2 , For example, a switch of the fixed network 2 , sent. The landline 2 sends the UUS1 message as part of a setup message to the S0-BoxNT 1b in a third step further. The S0-BoxNT 1b Represents the original setup message of the participant 3a Restore and send them in a fourth step to the PBX 3b ,

In a fifth step, the S0-BoxTE acknowledges receipt of the setup message to the subscriber 3a , In a sixth step, the landline confirms 2 Receiving the setup message of the S0-BoxTE 1a , In a seventh step, the S0-BoxNT confirms the reception of the setup message to the landline 2 , In egg An eighth step confirms the PBX 3b the reception of the setup message of the S0-BoxNT 1b ,

In a ninth step sends the PBX 3b to the S0-BoxNT 1b a connect message. In a tenth step sends the S0-BoxNT 1b a connect message to the landline 2 , Here is the S0-BoxNT 1b set up to provide information, in particular status information about a connection between the S0-BoxNT and the PBX 3b or one at the PBX 3b Connected participants of the private network, packed in a UUS1 message that they use in the context of the Connect message to the landline 2 dispatches. In an eleventh step sends the landline 2 a connect message to the S0-BoxTE 1a , where the UUS1 message continues to be carried as part of this connect message. The S0-BoxTE unpacks the received UUS1 message. The information received via the UUS1 message can be evaluated and lead to the initiation of various measures, for example a rerouting. In a twelfth step, the S0-BoxTE sends a Connect message to the remote participant 3a ,

The entire connection is established via a D-channel of the fixed network 2 , The connection between the S0-BoxTE 1a and the S0-BoxNT 1b is via a selection of the S0-BoxNT1b by the S0-BoxTE 1a reached. For this is a list of public numbers of such S0-BoxNT devices 1b deposited in the S0-BoxTE.

The 9 shows a detailed representation of the in the context of the second embodiment of a communication system in 5 Connection establishment shown between a remote subscriber 3a and a private network subscriber of a private network.

The remote participant 3a initiates a connection to a private network subscriber (not shown) of a private network at the exchange PBX 3b and at the PBX-2 exchange 3c connected. As part of the connection setup sends the remote participants 3a , here an ISDN terminal, in a first step of a setup message to the S0-BoxTE 1a , The S0-BoxTE 1a packs this data in a UUS1 message. In a second step, the S0-BoxTE sends a setup message for establishing a connection with the S0-BoxNT to the fixed network 2 , As part of this setup message, the UUS1 message with the packaged information is sent. In a third step, the fixed network sends 2 a setup message to the S0-BoxNT 1b , where the UUS1 message is sent as part of the setup message. In a fourth step, the S0-BoxNT recognizes 1b that establish a connection between the S0-boxNT 1b and the PBX 3b not possible.

In a fifth step sends the S0-BoxTE 1a a setup confirmation to the remote participant 3a , In a sixth step sends the landline 2a a setup confirmation to the S0-BoxTE 1a , In a seventh step, the S0-BoxNT sends a setup confirmation to the landline 2 ,

In an eighth step, the S0-BoxNT sends a Disconnect message destined for the S0-BoxTE to the landline 2 , The S0-BoxTN packages the information that connects to the PBX 3b is not possible in a UUS1 message, which is sent as part of the disconnect message. In a ninth step sends the landline 2 a disconnect message to the S0-BoxTE 1a , where the UUS1 message is forwarded as part of the disconnect message. The S0-BoxTE 1a unpacks the UUS1 message and initiates a rerouting, prompted by the information contained in the UUS1 message.

As part of the rerouting sends the S0-BoxTE in a tenth step, a setup message, which for a second S0-BoxNT-2 1c is destined to the landline 2 , The public number of the S0-BoxNT-2 1c is also in a list of S0-BoxTE 1a deposited and as an alternative in case of a connection failure on the side of the S0-BoxNT 1b intended. As part of the setup message to the landline 2 will be the original UUS1 message containing the information about the remote subscriber 3a contains, also sent. In an eleventh step sends the landline 2 a setup message to the second S0-BoxNT 1c , As part of the setup message, the UUS1 message is sent to the second S0 BoxNT-2 1c passed on. The second S0-BoxNT unpacks the UUS1 message and represents the original, from the remote subscriber 3a sent Setup message to the S0-BoxTE. In a twelfth step sends the second S0-BoxNT 1c the restored setup message to the second PBX-2 3c ,

The connection described between the S0-BoxTE 1a and the S0-BoxNT boxes 1b . 1c takes place via a D-channel. A B channel has not yet been established at this time.

In an alternative embodiment, the remote participant 3a formed by an exchange of another private network. Accordingly, the S0-BoxTE 1a designed as S0-BoxTN.

In another alternative embodiment, the S0 BoxTE boxes 1a . 1d and the S0-BoxNT boxes 1b . 1c . 1e formed by a S0 box, which has all the functionalities. D. h., the S0 box can be used both as S0-BoxTE 1a as well as S0-BoxNT 1b etc. are used. The S0 boxes have suitable electronic components and programs for the functionalities described.

The Private network is preferably a private network according to one GSM-R standards (GSM = "Global System Mobile", R = "Railway").

The communication systems described with the network access devices 1a . 1b . 1c . 1d . 1e allow the establishment of a connection between a remote subscriber of a private network and a private network via a public network by means of a dial-up connection. The advantages of the communication systems described are that the D-channel signaling is transmitted transparently over the dial-up connection, that the connection times are short, and that own numbering plans and features can be maintained. Other benefits include minimizing dial-up blocking probability and backup capabilities.

By coding the language and tunneling through the landline 2 For example, the communication systems described above may additionally be configured to allow more than two parallel connections to be switched from a remote subscriber to the private network. This increases the performance of the connection.

Farther is the increase in the number of possible connections can be used for administration purposes. They are, for example Parallel data connections can be set up, which are connected to a S0 box the side of the private network are routed directly into a data network can, without a voice infrastructure of the private network to use. This allows the increase the management pollings and any data access.

In Another embodiment is instead of a UUS1 service for the transmission of information during the connection setup a provided by the fixed network Subdressing service used. The transfer of information finds in this case instead of UUS1 messages with subaddressing messages in a corresponding manner.

Also is it possible to share UUS1 service and subaddressing service to use in parallel.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10034319 A1 [0008]
• - DE 10257966 A1 [0010]

Claims (19)

Method for establishing a communication connection between a subscriber remote from a private network (VPN) ( 3a ) and another subscriber connected to the VPN network ( 3b ) via an ISDN landline ( 2 ) with UUS1 service and / or subaddressing service, whereby when establishing a connection for the remote VPN subscriber ( 3a ) from a network access device ( 1a ) by means of a UUS1 message and / or a subaddressing message, as part of a setup message, a connect message, and / or a disconnect message via the ISDN fixed network ( 2 ) to at least one other network access device ( 1b . 1c . 1d . 1e ) and to a participant ( 3b ) Are transmitted setup information, characterized in that the setup information information about the requested carrier services, a private network number of the remote subscriber 3a , (Calling-1), a private network number of a subscriber within the private network (Called_1), features of a private network and / or status information on the subscriber-side connection ( 3a ), and conversely call information for a connection establishment, features of a private network and / or status information about a subscriber-side connection ( 3b ) of another network access device ( 1b . 1c . 1d . 1e ) are received. Method for establishing a communication connection according to claim 1, wherein - the network access device ( 1a ) the dialed number, "Called_1", with the number of the at least one other network access device ( 1b . 1c . 1d . 1e ), "Called_2", replaces, - the network access device ( 1a ) in the calling number the number of the first subscriber ( 3a ), "Calling_1", with the number of the network access device ( 1a ), "Calling_2", replaces, - the network access device ( 1a ) packages the information "Calling_1", "Called_1", UUS1_1, MLPP_1 and possibly further protocol elements in a UUS1 message UUS1_2, - the network access device ( 1a ) via a dial-up connection via the fixed network ( 2 ) the further network access device ( 1b ), - the network access device ( 1a ) as part of the connection setup by means of the setup message packed in the UUS1_2 from the remote subscriber ( 3a ) to the further network access device ( 1b ), - the at least one other network access device ( 1b . 1c . 1d . 1e ) after receiving the setup message in the called number its own number, "Called_2", with the dialed number, "Called_1" replaced, - the at least one other network access device ( 1b . 1c . 1d . 1e ) in the calling number the number of the network access device ( 1a ), "Calling_2", with the number of the remote subscriber, "Calling_1" replaced, - the at least one further network access device ( 1b . 1c . 1d . 1e ) unpacks the information "Calling_1", "Called_1", UUS1_1, MLPP_1 and possibly further protocol elements transmitted via the UUS1_2, - the at least one further network access device ( 1b . 1c . 1d . 1e ) based on this information the original of the remote participant ( 3a ) emulates a sent setup message, and - from the at least one further network access device ( 1b . 1c . 1d . 1e ) this simulated setup message is transmitted to the selected subscriber in the private network. Method for establishing a communication connection according to one of the preceding claims, wherein in idle times cyclically the availability of B-channels is checked and at least one traffic channel for a certain time is kept in stock and after expiration of this Time an unused connection is reduced, and if several user channels have been built up in stock, this in time offset one after the other. Method for establishing a communication connection according to one of the preceding claims, wherein a backup function is set up, so that when a connection between a network access device ( 1a ) and one at another network access device ( 1b ) can not be established by the network access device ( 1a ) a connection via a third network access device ( 1c . 1d ) to which the subscriber is also connected. Method for a backup function according to claim 4, wherein the network access device ( 1b ) after a futile attempt to establish a connection with the exchange ( 3b ) via the fixed network ( 2 ) to the network access device ( 1a ) in the context of a disconnect message, a UUS1 message is transmitted that contains information about the failure of the connection to the exchange ( 3b ), whereupon the network access device ( 1a ) a backup routing is activated by the network access device ( 1a ) a connection to the network access device ( 1c ) and from there the connection to the subscriber via a second exchange ( 3c ) is passed on. Method for establishing a communication connection according to one of the preceding claims, wherein a backup function is set up, so that when a connection between a first network gear device ( 1a ) and one at another network access device ( 1b ) can not be established by the network access device ( 1a ) a connection via a fourth network access device ( 1d ) to which the subscriber is connected to the public ISDN landline network, the first network access device ( 1a ) is set up with a list containing the public number of the fourth network access device ( 1d ) and for the rerouting of the first network access device ( 1a ) the Called Number Called_1, which denotes the private network number of the second VPN subscriber, by a number Called_2 which is the public number of the fourth network access device ( 1d ) is replaced. Network access device ( 1a ) for an ISDN landline ( 2 ) with UUS1 service and / or subaddressing service, wherein the network access device ( 1a ) is set up such that, when a connection is set up by a remote VPN subscriber ( 3a ) by means of a UUS1 message and / or a subaddressing message, as part of a setup message, a connect message, and / or a disconnect message via the ISDN fixed network ( 2 ) to at least one other network access device ( 1b . 1c . 1d . 1e ) and to a participant ( 3b ) Transmits setup information, characterized in that the setup information contains information about the requested bearer services, a remote subscriber's private network number 3a , (Calling-1), a private network number of a subscriber within the private network (Called_1), features of a private network and / or status information on the subscriber-side connection ( 3a ), and conversely call information for a connection establishment, features of a private network and / or status information about a subscriber-side connection ( 3b ) of another network access device ( 1b . 1c . 1d . 1e ) receives. Network access device according to claim 7, wherein - the network access device ( 1a ) the dialed number, "Called_1", with the number of the at least one other network access device ( 1b . 1c . 1d . 1e ), "Called_2", replaces, - the network access device ( 1a ) in the calling number the number of the first subscriber ( 3a ), "Calling_1", with the number of the network access device ( 1a ), "Calling_2", replaces, - the network access device ( 1a ) packages the information "Calling_1", "Called_1", UUS1_1, MLPP_1 and possibly further protocol elements in a UUS1 message UUS1_2, - the network access device ( 1a ) via a dial-up connection via the fixed network ( 2 ) the further network access device ( 1b ), - the network access device ( 1a ) as part of the connection setup by means of the setup message packed in the UUS1_2 from the remote subscriber ( 3a ) to the further network access device ( 1b ), - the at least one other network access device ( 1b . 1c . 1d . 1e ) after receiving the setup message in the called number its own number, "Called_2", with the dialed number, "Called_1" replaced, - the at least one other network access device ( 1b . 1c . 1d . 1e ) in the calling number the number of the network access device ( 1a ), "Calling_2", with the number of the remote subscriber, "Calling_1" replaced, - the at least one further network access device ( 1b . 1c . 1d . 1e ) unpacks the information "Calling_1", "Called_1", UUS1_1, MLPP_1 and possibly further protocol elements transmitted via the UUS1_2, - the at least one further network access device ( 1b . 1c . 1d . 1e ) based on this information the original of the remote participant ( 3a ) emulates a sent setup message, and - the at least one further network access device ( 1b . 1c . 1d . 1e ) transmits this replicated setup message to the selected subscriber in the private network. Network access device according to one of the preceding claims 7 or 8, wherein the network access device ( 1a . 1b . 1c . 1d . 1e ) is set up such that information to be transmitted for transmission is compressed by means of a UUS1 message and / or subaddressing message. Network access device according to at least one of the preceding claims 7 to 9, wherein the network access device ( 1a ) is set up with a network availability function, wherein the network availability function is such that the network access device ( 1a ) in the context of a connection setup before actually establishing the connection to a further network access device ( 1b ) checks whether in the fixed network ( 2 ) one or more channels are available for the connection and, if there are no or too few channels available, repeatedly attempting an actual connection to the further network access device ( 1b ) and, if an actual connection has finally been established, maintains it for a certain time. Network access device according to at least one of the preceding claims 7 to 10, wherein the network access device ( 1a ) is set up with a network availability function, wherein the network availability function is such that the network access device ( 1a ) in rest periods cyclically the Checks availability of B-channels and keeps at least one traffic channel for a certain time in reserve, and after this time degrades an unused connection, which, if several user canals have been built on stock, these temporally offset degrades successively. Network access device according to one of the preceding claims 7 to 11, wherein the network access device ( 1a ) is set up with a backup function, wherein the backup function is such that when a connection between the network access device ( 1a ) and one at another network access device ( 1b ) subscriber is not buildable, the network access device ( 1a ) establishes a connection via a third network access device ( 1c . 1d ) to which the subscriber is also connected. Network access device with a backup function according to claim 12, wherein the backup function ( 1a ) is set up in such a way that, after a futile attempt to establish a connection with the switching center ( 3b ) via the fixed network ( 2 ) to the network access device ( 1a ) transmits in the context of the disconnect message a UUS1 message containing information about the failure of the connection to the exchange PBX ( 3b ), whereupon the network access device ( 1a ) activates a backup routing by connecting to the network access device ( 1c ) and establishes the connection to the subscriber via a second exchange ( 3c ). Network access device according to at least one of the preceding claims 7 to 13, wherein the network access device ( 1a ) is set up with a list containing the public number of a fourth network access device ( 1d ), the network access device ( 1a ) for a rerouting the Called Number Called_1, which designates the private network number of the second subscriber TLN-2, by a number Called_2, which is the public number of the fourth network access device ( 1d ), replacing the VPN features. Communication system, at least comprising an ISDN landline network ( 2 ) with UUS1 service and / or subaddressing service, a first network access device ( 1a ) according to at least one of the preceding claims 7 to 14 for a first participant ( 3a ) and at least one second network access device ( 1b . 1c . 1d . 1e ) according to one of the preceding claims 7 to 14 for a second participant ( 3b ), wherein first network access device ( 1a ) and second network access device ( 1b . 1c . 1d . 1e ) via a network connection to the fixed network ( 2 ) are connected for communication via the fixed network ( 2 ) and the first participant ( 3a ) via a subscriber-side connection of the first network access device to the first network access device ( 1a ) and the second participant ( 3b ) via a subscriber-side connection of the second network access device ( 1b ) to the second network access device ( 1b ) connected. Communication system according to claim 15, additionally comprising a third network access device ( 1c . 1d . 1e ) according to at least one of the preceding claims 7 to 14, with the fixed network ( 2 ) connected is. Communication system according to one of claims 15 to 16, wherein the subscriber ( 3a . 3b . 3c . 3d . 3e ) at least one terminal ( 3a . 3d . 3e ) or an exchange ( 3b . 3c ). Communication system according to claim 17, wherein the exchange ( 3b . 3c ) an exchange ( 3b . 3c ) of a private network. The communication system of claim 18, wherein the Private network is a GSM-R network.