CN1144497C

CN1144497C - Device and call setting method for providing voice over internet protocol

Info

Publication number: CN1144497C
Application number: CNB001094475A
Authority: CN
Inventors: ��һ; 朴一; 崔文圭
Original assignee: LG Information and Communications Ltd
Current assignee: Ericsson LG Co Ltd
Priority date: 1999-07-27
Filing date: 2000-06-23
Publication date: 2004-03-31
Anticipated expiration: 2020-06-23
Also published as: KR100312598B1; CN1282198A; KR20010011275A

Abstract

An apparatus and call setup method for providing Voice over Internet Protocol (VOIP) to a switching system. The device for providing VOIP and the call setting method can operate efficiently and reduce circuit channel occupation at the same time. The internal structure of the switching system includes the functions of a trunk gateway, a call connection agent, a service agent, a server signaling point, and a signaling gateway. When the VOIP business increases, it does not occupy the line resources of PSTN/ISDN. In addition, when VOIP is provided, it is possible to reduce the number of signaling messages required. Therefore, services can be easily provided to users without additional network structures.

Description

Device and calling setting-up method by the speech of Internet protocol are provided

Technical field

The present invention relates to a kind ofly, particularly relate to device that VOIP is provided and calling setting-up method with lower circuit channel occupancy for switching system provides device and a kind of calling setting-up method (VOIP) of the speech (VoiceOver Intemet Protocol) by Internet protocol.

Background technology

Referring to being entitled as " PSTN fallback using dial on demand routing scheme " United States Patent (USP) 6,542,499 and the United States Patent (USP) 6 that is entitled as " Automatic IP directory number masking anddynamic packet routine for IP phone surveillance ", 560,224, for the voice call that is generated by public switched telephone network (PSTN)/integrated services digital network (PSTN/ISDN) is provided to VOIP, voice call is sent to trunk gateways, serve as gateway by tandem switch in this trunk gateways of transmitting terminal.Be routed to core net then according to this voice call of grouping/circuit conversion treatment conversion, and with voice call.At receiving terminal, voice call is outputed to trunk gateways as a kind of gateway, and handle by grouping/circuit inverse conversion and to be routed to PSTN/ISDN.Thus, bring in to finish with reception and communicate by letter by connecting transmitting terminal.

Fig. 1 has illustrated that a kind of switch for prior art provides the method for VOIP function.System comprises core net 10, service agent 11 and Route Selection and translating server 12, wherein, core net 10 is switches of being realized by circuit, grouping or cell switching method, the business that service agent 11 management are provided by core net, Route Selection and translating server 12 are used for carrying out calling route setting and number translation function.System also comprises calls out the circuit information database (LIDB) 21 or 800 that connects agency 13 and have user profile and business information, calls out to connect agency's 13 callings that are used to handle from core net.In addition, work as switch, that is, when Signalling Transfer Point is received call request to 22, provide TU Trunk Unit to be used to visit database such as LIDB or 800.This system also comprises (EO) 23 of a plurality of end office (EO)s and tandem switch 24 and user 25, and each end office (EO) 23 all is intercity switch, and tandem switch 24 is extramural, city switches.

In addition, core net and PSTN/ISDN net comprise the SGW 32 of supporting end-to-end signaling and the trunk gateways 31 that is used for the deal with data business.

The voice signal that said structure is used for being generated by PSTN/ISDN is sent to core net.The Route Selection path of voice service is as follows among Fig. 1: user → EO → tandem switch → trunk gateways → core net → trunk gateways → tandem switch → EO → user.

Fig. 2 is explanation is used to be provided with the Route Selection path of VOIP in the switch of prior art figure.This system comprises that first service switching point 11, the first SGW SG1 2, the first trunk gateways TG1 3, first call out to connect and act on behalf of CCA1 4, and wherein SSP1 1 is the functional block of transmitting terminal.This system comprises that also second service switching point 25, the second SGW SG2 6, the second trunk gateways TG2 7, second call out to connect and act on behalf of CCA2 8, and wherein SSP2 5 is functional blocks of receiving terminal.Route Selection and translating server RTS 9 also are provided, and RTS9 carries out call path setting and number translation.

The routing procedure of above-mentioned functions piece is described with reference to Fig. 2.At first, shown in step 1-4, the Service Switching Point 1 of transmitting terminal sends to first by first SGW (SG) 2 with connection request and calls out connection agency (CCA1) 4.Then, in calling connection and the data transaction of step 5-8 generation from a CCA 4 to first trunk gateways (TG) 3.Determine that by inquiry Route Selection and translating server (RTS) 9 one receives corresponding the 2nd CCA 8 of PSTN/ISDN at step 9-11.Then a CCA 4 connects to the 2nd CCA8 request in step 12.

Shown in step 13-18, the 2nd CCA 8 sets up pseudo channel and connects between TG1 and TG2.Then shown in step 19-23, a CCA 4 sends connection request to the 2nd SSP 5, and the 2nd SSP 5 finishes the call setting operation.Subsequently at step 24-33, the 2nd SSP 5 sends ring back tone and will be connected by the 2nd SG 6, the 2nd CCA 8, a CCA 4 and a SG 2 to the user and message is set sends to a SSP 1.

When the reception user responds, ring back tone that the 2nd SSP 5 eliminations can be heard and setting and reception user's path.After this, response message sends to a SSP, and a SSP 1 is set to user's transmission path after receiving response message, and a SSP 1 finishes the bi-directional call path to finish the call setting operation.

In the prior art, be provided with a large amount of signal links during handling, wherein before handling calling, inquiry is carried out the functional block of call treatment and is carried out the base station that voice call traffic, number translation and Route Selection are operated.Therefore, take the channel of each switch, when the request number of VOIP function increases, taken the end office (EO) (EO) of PSTN/ISDN or the line resource of switching system and tandem switch.In addition, need a large amount of functional blocks to realize VOIP, and increased new network configuration.

Here the content on incorporate in suitable place is used for the suitable instruction of other or another details, feature and/or technical background as a reference.

Summary of the invention

An object of the present invention is to switching system provides VOIP function, it has overcome one or more problems that the shortcoming by prior art causes significantly whole or in part.

Another object of the present invention is that the switching system for the channel occupancy with minimizing provides VOIP function.

Another object of the present invention is to provide calling setting-up method for the VOIP switching system.

Another object of the present invention is for switching system provides VOIP function, this system can be in switch inside effectively assignment signalling gateway (SG), call out and connect agency (CCA) and trunk gateways (TG) so that VOIP is provided.

Another object of the present invention provides VOIP and reduces the desired signal message count, takies with the maximum of the line resource of avoiding reaching PSTN/ISDN.

For realizing above-mentioned purpose, a kind of complete electronic switch is provided, provide method, this switch to comprise switching subsystem processor, be used to exchange and translate exchange and number translation processor, operation and maintenance processor, Internet protocol server and the No.7 signalling system that is Entered Number being used for the VOIP of this electron exchanger (by the speech of Internet protocol) as user processor.

In order to realize above-mentioned purpose of the present invention further wholly or in part, a kind of switching system is provided, this system comprises time division switch, be coupled to the subscriber line interface of time division switch, be coupled to time division switch and with the digital trunk interface of ISDN/PSTN and No. seven intelligent networks coupling, be coupled to the No.7 signalling system of No. seven signals of processing of time division switch and data/address bus, be coupled to the modem interface of time division switch and data/address bus, be coupled to the Internet protocol server of time division switch and data/address bus, be coupled to the local service equipment of time division switch, be coupled to the big capacity storage switch of data/address bus, with the processor unit that is coupled to data/address bus, so that realization signal processing, a kind of in call treatment and the number translation, this processor unit comprises being used to carry out to be safeguarded and the operation and the maintenance processor of operation; The switching subsystem processor, it is that the user handles processor; With the exchange and the number translation processor that are used to realize exchange and translate.

In order to realize above-mentioned purpose of the present invention further wholly or in part, a kind of calling setting-up method that provides in the PSTN/ISDN net by the speech of Internet protocol is provided, comprise step: connect agency's transmission connection request to the calling of receiving terminal from the Service Switching Point of transmitting terminal, be used for calling out connection and data transaction from the calling connection agency of transmitting terminal to the trunk gateways transmission instruction of transmitting terminal, carry out the Route Selection and the translating server of call route selecting and number translation by the calling connection proxy requests of transmitting terminal and determine that the calling that arrives end is connected the agency, calling by transmitting terminal connects proxy requests is connected the agency with the calling that arrives end connection, connect the trunk gateways of acting on behalf of to the arrival end from the calling that arrives end and send the channel that instruction is used to be set to the transmitting terminal trunk gateways, be connected the agency with the calling of holding to the Service Switching Point transmission connection request that arrives end from arrival.

In order to realize above-mentioned purpose of the present invention further wholly or in part, a kind of coupling switch that is used for network is provided, comprise Internet protocol server and No.7 signalling system, wherein by interprocess communication channel couples Internet protocol server and No.7 signalling system.

In order to realize above-mentioned purpose of the present invention further wholly or in part, a kind of method that provides in the PSTN/ISDN net by the speech of Internet protocol is provided, comprise step: call out to connect to first from first Service Switching Point and act on behalf of transmission interprocess communication (IPC) channel connection request, connect the agency from first calling and be used for calling out connection and data transaction to first trunk gateways transmission IPC channel instruction, determine that by inquiry Route Selection and translating server corresponding second calling is connected the agency, call out the connection that connects proxy requests to the second calling connection agency by first, call out the connection agency from second and be used to be set to the channel of first trunk gateways, and between second trunk gateways and first trunk gateways, set up channel to second trunk gateways transmission IPC channel instruction.

In order to realize above-mentioned purpose of the present invention further wholly or in part, a kind of coupling switch that is used for network is provided, comprise call out to connect the agency, by interprocess communication (IPC) channel couples to call out the SGW that connects the agency, by the IPC channel couples to call out the trunk gateways that connects the agency and be coupled to SGW and transmission gate in one Service Switching Point.

Those of ordinary skills can in the following description or can learn other advantage of the present invention, purpose and feature from the practice of the present invention.As the appended claims specifically noted, can realize and obtain objects and advantages of the present invention.

Description of drawings

Describe the present invention in detail now with reference to accompanying drawing, similarly Reference numeral refers to similar unit in the accompanying drawings, wherein:

Fig. 1 is the network structure of the VOIP system of explanation prior art;

Fig. 2 is the call setup process figure of key diagram 1;

Fig. 3 illustrates switching system figure according to the preferred embodiment of the invention;

Fig. 4 is the figure of explanation professional route of VOIP in switch according to the preferred embodiment of the invention;

Fig. 5 illustrates the network structure of VOIP system according to the preferred embodiment of the invention; With

Fig. 6 illustrates call setup process figure according to the preferred embodiment of the invention.

Embodiment

Fig. 3 illustrates the block diagram of switching system inside according to the preferred embodiment of the invention.This system comprises subscriber line interface (SLI), with the digital trunk interface (DTI) of ISDN/PSTN or No. seven intelligent networks coupling be used for the No.7 signalling system (SS7) of No. seven signal processing.This system also comprises as the modem interface of modem call terminal installation (MDI) with as the data processor (DH) of data processing equipment.

In addition, this system comprises the big capacity storage switch (MMS) of Internet protocol server (IPS), local service equipment (LS) and the big capacity packet switch apparatus of conduct as the IP processing unit.Time division switch (TSW) also is provided, also has operation and maintenance processor (OMP) and as the switching subsystem processor (SSP) of user processor.This system also comprises in return exchange and the number translation processor (SNP) with the number translation processor.

For VOIP is provided, IPS carries out compression and also has packet switched and inverse conversion.IPS also carries out the TG function of prior art.SS7 is the intelligent network matching unit, is used to carry out SSP function of the prior art and SG function.In addition, SSP/OMP/SNP carries out the signal processing, call treatment, number translation of intelligent network etc., also carries out the CCA and the business proxy function of prior art.

Fig. 4 illustrates the professional route of the VOIP in the switching system according to the preferred embodiment of the invention.In fact, Fig. 4 has illustrated routing procedure, and wherein the voice call according to circuit switching method input in the switching system is routed to Packet Based Network.In above-mentioned route setting operation, the call signal of advanced intelligent network/No.7 signalling system (AIN/SS7) net is set to time division switch and link (TSL) by DTI, and DTI is digital matched interfaces.Be set to IPS in the call signal of user network and trunk line network by analog subscriber interface (ASI) and DTI, and be connected to SSL, so that realize packet switching according to visit to MMS by TSL as the IP processing unit.

Be described in the professional routing implementation example of user side now.At first, the user utilizes particular number of terminal input of VOIP business (for example, #300), and to carry out number translation by exchange/translation processor of respective switch.

At IPS by user's voice service being carried out packet transaction such as the compression and the particular procedure of encoding process.Then utilize the bandwidth of distributing to Packet Service TSL and space switching machine and the link (SSL) by switching system that the business after the packet transaction is sent to MMS, take with the circuit resource of avoiding switching system.The bandwidth that is provided for existing voice service is provided packet bandwidth in logic.

TSL arrives MMS by interprocess communication gateway (IPC G/W).IPC G/W is the gateway that call control data existing in the switch and grouped data is sent to MMS, and wherein MMS is central centralized operating system, with reference to switching subsystem processor and the device handler (DP) of Fig. 4.

Afterwards, the voice service after the packet transaction is routed to IP network from MMS by IP gateway.

Inverse process is then described.In inverse process,, be sent to second user by IP GW, MMS, SSL and TSL from first user's of IP network input speech according to grouping and the decode operation of IPS.

When Fig. 5 and Fig. 6 explanation is arranged in according to the preferred embodiment of the invention PSTN/ISDN when switching system, provide network configuration and the call setup process of VOIP.As shown in the figure, the compare VOIP structure of prior art of Fig. 1 might be saved line resource.

In other words, when according to this embodiment of the invention switching system is installed in PSTN/ISDN, as shown in Figure 5, provide the network configuration of VOIP to comprise that core net 51, PSTN/ISDN and signaling transfer point (STP) are to 52 and 800 or LIDB 53.It also comprises EO or tandem switch 54, service agent 55 and RTS 56.EO and tandem switch comprise SSP, SG, TG and the CCA function with AIN and PSTN/ISDN coupling.

Above-mentioned EO or tandem switch 54 can be saved or keep from EO or tandem switch to the line resource of core net and the line resource EO or the tandem switch.In EO or tandem switch, can directly handle with call setting and operate the relevant message of necessary SS7.

Fig. 6 explanation is used for being described in the structure that calling procedure is set in the VOIP structure of Fig. 5, by the switch that comprises TG, SG, CCA function and the TRS that is used to carry out Route Selection operation and translation form.

As shown in Figure 6, at step 1-4, SSP1 61 sends connection request by SG1 62 to CCA1 64.Shown in step 6-8, CCA1 64 order TG1 63 call out and connect and data transaction.At step 9-11, CCA1 64 inquiry RTS 69 are so that determine to receive the corresponding CCA of PSTN/ISDN.Then shown in step 12, CCA1 64 sends connection request to CCA2 68.

At step 12-18, CCA2 68 order TG2 67 are provided with the circuit with TG1, for example virtual circuit.Shown in step 19-23, CCA2 68 sends connection request to SSP2 65, and SSP265 finishes the call setting operation., after the user sends ring back tone, send to be connected to SSP1 61 by SG2, CCA2, CCA1 and SG1 at step 24-32 message is set at SSP2 65.

When the reception user responded, SSP2 65 eliminated the ring back tone that can hear, and reception user and path are set.Then, SSP1 61 finishes the bi-directional call Route Selection to finish the call setting operation.

As shown in Figure 6, the solid line interconnection line is represented the internal signal processing of switch.In other words, because comprise SG, TG, CCA function in EO or the tandem switch 54, so be not by network but by the message transmission between execution SG, TG of interprocess communication (IPC) channel in the switching system and the CCA.

Therefore, in the external signal stream of Fig. 5,

mark

9,12,16 and 18 is actual signal flows.

As mentioned above, switch preferably includes trunk gateways, calls out the function that connects agency, service agent, server signalling point and SGW.Therefore not the line resource that takies PSTN/ISDN according to the increase of VOIP.In addition, might reduce the signal message quantity that when VOIP is provided, produces significantly, and the communication traffic that is provided can provide high-quality the professional network element that additionally do not use for the user.

Above embodiment and advantage be exemplary and can not be interpreted as restriction the present invention.The present invention can be used for the device of other type at an easy rate.Description of the invention is illustrative, does not limit the scope of the claims.Multiple replacement, improvement and change are for a person skilled in the art clearly.In the claims, the statement that device adds function has covered the structure of carrying out the function of being quoted here, not only comprises the equivalent of structure but also comprises equivalent configurations.

Claims

1. A switching system comprising:

time switch;

coupled to the subscriber line interface of the time division switch;

A digital trunk line interface coupled to a time division switch and matched with ISDN/PSTN and No.7 intelligent network;

A No. 7 signaling system coupled to the time division switch and the data bus, which handles the No. 7 signal;

a modem interface coupled to the time division switch and the data bus;

an internet protocol server coupled to the time division switch and the data bus;

local service equipment coupled to the time division switch;

a mass storage switch coupled to the data bus; and

A processor unit coupled to the data bus for one of signal processing, call processing and number translation, the processor unit comprising:

An operation and maintenance processor for performing maintenance and operations;

a switch subsystem processor, which is a user processing processor; and

Interchange and number translation processors for implementing exchanges and translations.

2. The system of claim 1, wherein the Internet Protocol server implements packet data compression/deletion and packet data conversion/recovery.

3. The system of claim 1, wherein the mass storage switch is a bulk packet switch that stores call control data and packet data and sends these data to the inter-process control gateway.

4. The system of claim 1, wherein the internet protocol server operates as a trunk gateway.

5. The system according to claim 1, wherein said No. 7 signaling system operates as a service switching point and a signaling gateway, wherein the service switching point is used for matching with an intelligent matching unit, and the signaling gateway is about the control of the call Signal gateway.

6. A method for setting the call of the voice provided by the Internet Protocol in the PSTN/ISDN network, comprising steps:

Step 1 of sending a connection request from the service switching point at the transmitting end to the call connection agent at the transmitting end;

Step 2 of sending instructions from the call connection agent at the transmitter to the trunk gateway at the transmitter for call connection and data conversion;

Step 3 of determining the call connection agent at the destination by the routing and translation server requesting the call routing and number translation from the call connection agent at the transmitting end;

Step 4 of requesting, by the Call Connection Agent at the transmitting end, a connection with the Call Connection Agent at the arriving end;

Step 5 of sending an instruction from the Call Connection Agent at the arriving end to the Trunk Gateway at the arriving end for setting up a channel to the Trunk Gateway at the transmitting end; and

Step 6 of sending a connection request from the call connection agent at the destination to the service switching point at the destination.

7. The method of claim 6, wherein the call connection brokers, trunk gateways, and service switching points of the transmitting end and the arriving end are functional blocks included in a switching system.

8. The method according to claim 6, wherein the service switching point and the signaling gateway of the transmitting end and the arriving end perform the function of the SS7 intelligent network matching unit of the switching system.

9. The method of claim 6, wherein an internet protocol server is used as a trunk gateway.

10. The method as claimed in claim 6, wherein the actual call connection route of the service switching point at the transmitting end and the service switching point at the arriving end is connected with the calling connection agent and the signaling gateway at the arriving end through the signaling gateway and the call connection agent at the transmitting end.

11. The method of claim 6, wherein steps 1, 2, 5, and 6 are performed through an IPC channel.

12. A method for providing voice over Internet Protocol in a PSTN/ISDN network, comprising the steps of:

Send an inter-process communication (IPC) channel connection request to a first call connection agent from the first service switching point;

Send an IPC channel command from the first call connection agent to the first trunk gateway for call connection and data conversion;

determining a corresponding second call connection agent by querying the routing and translation server;

requesting a connection to a second call connection agent by the first call connection agent;

Sending an IPC channel command from the second call connection agent to the second trunk gateway is used to set the channel to the first trunk gateway; and

A channel is established between the second trunk gateway and the first trunk gateway.

13. The method of claim 12, wherein the IPC channel is an internal communication of the switch.

14. The method of claim 12, further comprising the step of sending a connection request from the second call connection agent to the second service switching point.

15. The method of claim 12, wherein the channel is a virtual channel.