DE10235246A1 - Call divert with decision via QSIG lines involves sending connection request to called system with ROSE operation, control parameter as criterion for called system call divert with decision activation - Google Patents

Abstract

The method involves establishing a connection between a calling system and a call destination system via a transmission path with at least one private network section and QSIG signaling by sending a connection request to a called system with a ROSE operation and a control parameter as a criterion for whether call diversion with decision is activated at the called system. The control parameter is transported in the first setup message. The method involves establishing a connection between a calling telecommunications system and a call destination telecommunications system via a transmission path with at least one private network section and signaling in accordance with the QSIG standard by sending a connection request to a called telecommunications system with a remote operations service element or ROSE operation and a control parameter as a criterion for whether call diversion with decision is activated at the called system, whereby the control parameter is transported in the first setup message in the common information segment. AN Independent claim is also included for the following: (a) an arrangement for implementing the inventive method.

Description

The present invention relates to a method for 'call forwarding with decision' in a telecommunications network according to the preamble of claim 1.

A telecommunications system represents in the following a device, the telecommunications terminals (TC terminals) or a telecommunications network to another telecommunications network followed. TK terminals are known Telephones, network-compatible Computer with running communication software, operator stations or Faxes et al The term 'gateway' describes a server in which the transition between the public Telecommunications network (DSS1) and the private telecommunications network (QSIG / PSS1) takes place.

Under a calling PBX here understood a system from which an initial connection is established becomes. Such a calling PBX is also referred to below as originating Referred to as PINX (Private Integrated Services Network Exchange), what is usual here corresponds to English language usage. A called PBX is a system from which rerouting, i.e. call forwarding, is sent away becomes. Such a called PABX is also called in the following Served User PINX called. Under a call destination PBX understood a system in which the destination of the call diversion is. Such a call destination PBX is diverted to PINX below called. A telecommunications system in which the requirement of Call forwarding carried out is wearing hereinafter referred to as Rerouting PINX.

It is already known the QSIG protocol for private Use telecommunications networks. When networking PBXs different manufacturers this protocol provides a powerful, standardized signaling system. It is one from the standardization body ETSI recognized platform for developments in the heterogeneous networking of telecommunications systems. The standardization takes place at international level through ISO / IEC and in Europe through ETSI and ECMA, with mutual harmonization of the Standards is sought. The QSIG protocol is officially called 'D-KanaI protocol at the Q reference point'. The Q reference point is the logical signaling point between two telecommunications systems. The physical connection takes place on C-reference point. QSIG works on the third layer, the network layer of the OSI 7-layer model.

The connections between the individual Network nodes of the private telecommunications network are through dedicated lines and / or dial-up lines and / or IP (Internet protocol) routes (via so-called IP gateways) realized, with any configuration occurring in a network can. Such private telecommunication networks are part of so-called gateways the public Telecommunication network connectable. The basics of the QSIG protocol form the basic calls (BC), i.e. the basic messages, and the generic Function Protocol (GF), i.e. generic functions.

In BC the connection and - dismantling and error handling. Construction and dismantling of QSIG connections between the individual nodes of the private Telecommunications network are accordingly by means of messages from the BC made.

The GF provides the protocol mechanisms for the Management of supplementary services and additional Network features (additional Network features) ready. The Supplementary Services (SS) are performance features which the QSIG protocol for provides the users of the TK network. Under Addtional Network Features (ANF) are functions that are independent of Users managing connections or the services of the whole Improve the network. For Manufacturers to whom the basic features of QSIG (automatic Recall, recall with free, call forwarding, call transfer, Call forwarding, interception, etc.) are not sufficient, QSIG offers the Generic Functional Procedures (QSIG GF). This standardized The method is used to transport non-standard functions and for message handling in the QSIG network.

The following standards describe the basic communication at QSIG, the so-called Basic Call: ETS 300 172 Edition 3, ISO / IEC 11 572 Edition 2 and ECMA 143, 3rd Edition. The standards for Call forwarding, the so-called diversion are described below in: ETS (European Telecommunications Standard) 300 257, edition 1; ISO (International Standard Organization) / IEC (International Electrotechnical Commision) 13873, Edition 1 and ECMA (European Computer Manufacturers Association) 174. General information can be found at QSIG are stored in the Common Information section, which is the standards comprising: ETS 301 820: 2000 and ISO / IEC 15 772: 1998. Additional features can be found in QSIG Standard Generic Functions are stored, which includes: ETS 300 239, Edition 2, ISO / IEC 11 582, Edition 1 and ECMA 165.

The specified QSIG standards allow the defined functions to be used when the end devices involved are switched on in systems that are connected to one another via QSIG lines or QSIG dial-up connections. These QSIG functions can also be used via QSIG dial-up connections as soon as the operator of the public network allows interworking with QSIG. With this virtual networking, a fee-free setup is possible. If there is a call connection, this is chargeable. This eliminates the need for dedicated lines or leased lines.

Diversion's QSIG standard knows an optimization with a 'section-wise route switching', which hereinafter referred to as forward switching. The Served user PINX for rerouting PINX. If this rerouting request from the Originating PINX rejected because, for example, the service unsupported, so leads the Served User PINX does the forward switching (rerouting) itself. The negative attachment is over call forwarding is informed.

This forward switching can also in the Served User PINX can be enforced by sending the rerouting request repressed and the call forwarding is carried out directly itself. In this context 'Call forwarding with decision' is however not possible either a later one Trigger the Connection (late release).

It is an object of the invention To provide a method which involves a 'call diversion with decision' in a network with at least partial QSIG signaling enables at reduced costs.

This task is accomplished through a process solved according to claim 1.

An essential idea of the method according to the invention is that a rerouting request to the originating PINX via QSIG is sent and thus the calling PBX decides whether a new connection to the call forwarding destination takes place should. The first connection establishment is always triggered. It takes place no renewed connection establishment when the calling PBX decides not to want to reach the call forwarding destination. This means that the feature 'Call forwarding with decision' is all in one QSIG network and a virtual QSIG network can be used.

The process builds on the generic Functions (ETS 300239 ISO / IEC 11582, ECMA 165), the ROSE (Remote Operation Service Element) concept (CCITTX.219 / X.229), ASN.1 (X.208 / X.209), the Common Information (ETS 301 820: 2000, ISO / IEC 15772: 1998) and diversion (ETS 300 257, ISO / IEC 13873, ECMA 174).

The ROSE concept defines the environment, for additional Realizing functions. It is used in the standardized Supplementary services, but it is also used to control manufacturer-specific Supplementary services used. The ROSE actions (RO-Invoke, RO-Result, RO-Error, RO-Reject-U, RO-Reject-P) are based on four protocol elements displayed. Such protocol elements are called Application Protocol Data Unit (APDU). The four protocol elements are: RO-Invoke, RO-Return-Result, RO-Return-Error, RO-Reject. The ROSE protocol elements are transmitted using the FACILITY information element. The FACILITY information element is either with basic calls, i.e. Transfer messages such as SETUP, ALERT, CONNECT, PROGRESS or DISCONNECT or, if no basic calls are available, use the to using the FACILITY message. Multiple ROSE protocol elements can be used in a FACILITY information element be included.

The control parameter is in the first SETUP message and transported there in the common information segment. This means that the first time a connection is established in the SETUP message Information filed that the called PBX has the feature 'Call forwarding with decision (RUE)' activated. This information is in the Common Information subject (CmnExtData: NetDevice: feature-list: RUE) transported to the Serve User PINX. This is again a Criterion for a rerouting request in the originating PINX via QSIG ro and so the calling PBX can decide, whether a new connection to the call forwarding destination takes place should. The first connection establishment is basically triggered, and it the connection is not re-established if the calling party PBX decides not to reach the call forwarding destination to want. The Served User PINX is with a DISC (disconnect) triggered and the process is finished. The calling PBX decides however for a new setup to the call forwarding destination, the SETUP message sent to Diverted-to PINX. Other processes correspond to the QSIG standard for diversion.

Allow the Generic Functions and ROSE the definition of performance features both at the level of standardization as well as the definition of proprietary Characteristics. The 'Call forwarding with decision' procedure described here in the QSIG network is a proprietary feature route optimization in the QSIG network, with a virtual Connection (QSIG dial-up connections) via the Office to add a cost optimization, since there are still fees for one A second connection can be saved.

It is advantageous if the alternative execution of steps b1 or b2 of claim 1 is controlled from the called PBX. On the one hand, this is supported by the QSIG standard, on the other hand, simple process control with the exclusion of further telecommunications systems or involved end devices guaranteed.

A ROSE operation is preferred in the first SETUP message and there in the common information segment transported. This ROSE operation is defined by the manufacturer, but can be cross-network wherever manufacturers of other telecommunications systems use the QSIG standard in their devices support. In a domain have to therefore at least the originating PINX and thus the rerouting PINX and the Served User PINX have implemented this proprietary solution. A The configuration for the call diversion decision option is the summary from the Originating PINX and Rerouting PINX.

The ROSE operation is also preferred filed in the facility information element. Again, this corresponds the QSIG standard and guaranteed transparency of the process even in a heterogeneous environment, i.e. over borders private and public Networks and between systems from different manufacturers.

In particular, the facility information element with the coding RejectAny-UnrecognizedOperation is sent. This will force the Served User PINX, the the inventive method unsupported, a reject APDU sends to the originating PINX, which this then as rejection the 'call forwarding with decision'. With that the PBX in the inventive method involved who do not support this themselves.

In practice, the communication route QSIG leased lines and / or between the PBXs as a rule dial-up connections include. The method according to the invention is thus both private Networks (leased lines) as well as public networks (dial-up connections) made usable, although in the latter by the QSIG protocol the corresponding network operator (carrier), e.g. ARCOR is supported.

It is particularly advantageous if the communication path between the PBXs in whole or in part via QSIG IP gateways or the internet is. The gateways mentioned offer access to world-wide networks, with which the inventive method for special many users can be reached and thus used.

The call destination PBX can be identical with the calling or called PBX. Independently of, which of the participating PBXs contains the call destination is a corresponding flexibility of the method according to the invention guaranteed.

For signaling messages via ISDN are exclusively D-channel connections used, with which the inventive method both for connections with and without user channel assignment (ISDN B channels), that is as a pure signaling connection.

The following is the method according to the invention based on an embodiment explained in more detail. It demonstrate:

1 the process sequence according to the invention on the basis of messages exchanged between the participating PBXs in the event of a successfully diverted call with decision;

2 the method according to the invention on the basis of the messages exchanged between the telecommunications systems involved in the case without a call diversion decision option; and

3 a QSIG protocol model as a block diagram with the new feature SS control for call forwarding.

The 1 shows the inventive method based on the originating and rerouting PINX between the participating PBXs 11 , Served User PINX 12 and Diverted-to PINX 13 Exchanged messages in the event of a successful call diversion with decision. In this constellation it is assumed that the feature 'Call forwarding with decision' (RUE) on the originating PINX 11 is activated.

The in the exchanged messages SETUP, FACILITY, ALERT and CONNECT transferred in the course of the procedure ROSE operations are below the corresponding message assigned to the direction arrow. These ROSE operations are: cmnInform.inv (Invoke), callRerouting.inv (Invoke), callRerouting.rr (Return Result), divertingLegInformation2.inv (Invoke) and divertingLegInformation3.inv (Invoke).

A caller now wants from the originating PINX 11 , i.e. the calling PBX, a connection to the Served User PINX 12 , i.e. the called PBX, the SETUP message is sent to the Served User PINX when the connection is first established 12 cleverly. This contains the information that the originating PINX 11 the RUE feature is activated. This diversion information is stored in the Common Information (cmnInform.inv) and there in the subject (CmnExtData: NetDevice: feature-list: RUE).

At the Served User PINX 12 the control parameter RUE is now evaluated and if call forwarding exists, in the present case by the served user PINX 12 to the Diverted-to PINX 13 , a facility message with the content callRerouting.inv returned. This message is confirmed by the Originating PINX with the message FACI-LITY and the content callRerouting.rr.

The Originating PINX 11 becomes rerouting PINX 11 and triggers the connection with the DISC (disconnect) message. This basically happens when the RUE feature on the originating PINX 11 is supported and call forwarding on the Served User PINX 12 is present.

Line L marks the status at which the caller can now decide whether to re-establish a connection to the diverted-to PINX 13 , the call destination PBX should take place or not. This can be the case, for example, if the caller with the call forwarding number can reach his secretary or his substitute as an alternative to the person he is actually talking to. If this is not of interest to the caller, he can also choose not to use this call diversion, ie not to re-establish a connection, this time to diverted-to PINX 13 to request.

However, if the operator decides to forward the call, a further SETUP message with the content divertingLegInformation2.inv indicates that the diverted-to PINX needs to establish a connection 13 cleverly. Is the diverted-to PINX 13 ready to establish a connection, it sends an ALERT message, followed by a CONNECT message with the content divertingLegInformation3.inv to the originating and rerouting PINX 11 back. This means that there is also a call connection between the originating or rerouting PINX 11 and the diverted-to PINX 13 built up.

The 2 shows the process flow according to the invention based on the originating PINX between the participating PBXs 11 , Served User PINX and Rerouting PINX 12 and Diverted-to PINX 13 exchanged messages in the case without call diversion decision possibility. It is assumed here that the TK terminal is the originating PINX 11 has not activated the 'Call forwarding with decision' feature.

The in the messages SETUP, FACILITY and CONNECT ROSE operations transferred as part of the process are also below the corresponding message assigned to the direction arrow. These ROSE operations are: cmnInform.inv (Invoke), divertingLegInformation1.inv (Invoke), divertingLegInformation2.inv (Invoke) and divertingLegInformation3.inv (Invoke).

Once again, a SETUP message with the content cmnInform.inv is sent to the Served User PINX in the first connection 12 cleverly. This time the control parameter RUE is not set in the subject (CmnExtData: NetDevice: feature-list: RUE). Now there is a call forwarding on the Served User PINX 12 before, this becomes rerouting PINX 12 and sends a SETUP message with the content divertingLegInformation2.inv directly to the Diverted-to PINX 13 which contains the call destination.

Is the diverted-to PINX 13 ready to establish a connection, it sends an ALERT message to the rerouting PINX 12 back, which in turn is the Originating PINX 11 with the FACILITY message with content diverting LegInformation1.inv informed about the call diversion. The rerouting signals PINX in a subsequent ALERT message 12 continue to be willing to establish a connection with the Originating PINX 11 , Finally, the connection is diverted from PINX 13 by means of a CONNECT message with content divertingLegInformation3.inv to the rerouting PINX 12 and finally from this to the originating PINX using a CONNECT message with the content divertingLegInformation3.inv 11 manufactured.

This means that for the caller who has not activated the 'Call forwarding with decision' feature, the call forwarding destination is in the diverted-to PINX 13 from the Originating PINX 11 automatically reachable.

It is therefore not absolutely necessary to rerouting the originating PINX 11 to be sent via QSIG if it does not use the 'Call forwarding with decision' functionality. However, the call forwarding destination is in the Originating PINX 11 can also be found on the in 1 shown procedure can be used and the rerouting request in the originating PINX 11 sent. In this case it would make sense to rerout the Originating PINX 11 to be left, otherwise served by the Served User PINX 12 a second setup was started and a second QSIG service would be required. In turn, this could also result in charges in the virtual network.

But the call forwarding destination is in the Served User PINX 12 or, as described, in the diverted-to PINX 13 To find an optimization with a forward switching is expedient, the served user PINX 12 for rerouting PINX 12 becomes. This optimization is a route optimization in the QSIG network, with a virtual connection (QSIG dial-up connections) via the exchange there is also a cost advantage, since fees for the second setup can still be saved here. The call forwarding destination as a criterion for an election evaluation can only be used in the served user PINX 12 be evaluated.

The ROSE operation to control the process in the Served User PINX 12 is transferred in the Facility information element of the SETUP message for the first connection establishment with content cmnInformation.inv. This facility information element is sent with the coding SourceEntity: EndPINX and DestinationEntity: End-PINX as coding for the network facility extension. The coding of the facility information element for the interpretation APDU is selected with RejectAnyUnrecognizedOperation.

The following table formally lists the contents of the private extensions of Common Information (CMN). The formal definition not only defines the content of the signaling, but also a so-called identifier, which uniquely identifies this signaling information within QSIG (cmnInform :: = {newforgsig Cmn_Inform ( 12 )}.

The storage space is also located here the control parameter RUE in the subject CmnExtData: NetDevice: feature-list: RUE.

CMN extensions

3 shows the QSIG protocol model as a block diagram with a coordination function 21 , a call control 22 and a number of SS controls (Supplementary Service Control) 23 , The new feature 'Call forwarding with decision' is derived from the SS control for call forwarding 23 ' controlled.

Other service elements such as ROSE (Remote Operation Service Element), ACSE (Access Control and Signaling Element) and DSE (Distributed Systems Environment) are used for identification. The call forwarding method according to the invention 23 ' is with the coordinating function 21 connected via which the SS control for diversion 23 ' uses the services of ROSE. The coordination function 21 is still with the GFT control (Generic Functional Transport Control) 24 connected.

The GFT control 24 shows two types of services. On the one hand, the transport service for protocol elements between functions that run on different PBXs, and on the other hand, the establishment and clearing of connections without user channel assignment, which are signaling connections. The GFT control 24 is equipped with a protocol control 25 connected, which carries out the transfer of protocol elements between neighboring PBXs and the establishment and dismantling of signaling connections between neighboring PBXs. Call control 22 is with the coordinating function 21 and protocol control 25 connected. The protocol control 25 transfers or receives data. The Signaling Carriage Mechanism (SCM) 26 , ie the signaling mechanism, then sends the messages to one line 27 or receives them from the line 27 ,

At this point it should be noted that all the parts described above are seen on their own and in any combination, especially that shown in the drawings Details are claimed as essential to the invention. amendments the skilled worker is familiar with this.

11

calling telecommunications system

12

Recalled telecommunications system

13

Call destination telecommunications system

21

coordinating role

22

call control

23 23 ', 23' '

SS control

24

GFT control

25

protocol control

26

signaling mechanism

27

management

Claims (8)

Call forwarding procedure with decision in a telecommunications network, with a calling ( 11 ), a called ( 12 ) and a call destination telecommunications system ( 13 ), a connection between the calling telecommunications system ( 11 ) and the call destination telecommunications system ( 13 ) is established over a transmission path with at least one non-public network section with signaling according to the QSIG standard, with the following steps: a) sending a first connection request from the calling telecommunication system ( 11 ) to the called telecommunication system ( 12 ) together with a ROSE operation cmnInform.inv and with a control parameter as a criterion for whether the calling telecommunications system ( 11 ) the call diversion with decision feature is activated, the control parameter being transported in the first SETUP message and there in the common information segment; b) evaluating the control parameter when there is a call diversion from the called telecommunication system ( 12 ) to the destination telecommunication system ( 13 ) and subsequent alternate execution of the steps: b1) sending a call diversion request from the called telecommunication system ( 12 ) to the calling telecommunications system ( 11 ) in the case in which the call diversion is activated with a decision on the calling telecommunication system; or b2) forwarding the first connection request through the called telecommunication system ( 12 ) to the destination telecommunication system ( 13 ) in the event that the call diversion is not activated with a decision on the calling telecommunications system; c) triggering the first communication link by the calling telecommunication system ( 11 ) in response to the call forwarding request in step b1 and, if necessary, sending a second connection establishment request from the calling telecommunications system ( 11 ) to the destination telecommunication system ( 13 ) if the call forwarding destination is to be reached. Method according to claim 1, characterized in that the alternative execution of steps b1 or b2 from the called telecommunication system ( 12 ) is controlled out. Method according to one of the preceding claims, characterized in that that the ROSE operation in the first SETUP message and there in the Common information segment is transported. A method according to claim 3, characterized in that the ROSE operation is stored in the facility information element. A method according to claim 4, characterized in that the Facility information element with the coding RejectAnyUnrecognizedOperation is sent. Arrangement for carrying out the method according to one of the preceding claims, characterized in that a communication link between the calling, called and call destination telecommunication system ( 11 . 12 . 13 ) QSIG includes leased lines and / or dial-up connections. Arrangement for performing the method according to one of claims 1 to 5, characterized in that a communication link between the calling, called and destination telecommunication system ( 11 . 12 . 13 ) runs in whole or in part via QSIG IP gateways over the Internet. Arrangement according to claim 6 or 7, characterized in that the call destination telecommunications system ( 13 ) identical to the calling ( 11 ) or the called ( 12 ) Telecommunication system is.