KR20060025869A - Softswitch for monitoring different softswitch and call distribution method using the same - Google Patents

Abstract

The present invention relates to a technique for efficiently distributing calls by monitoring the state of each other between soft switches using the SIP protocol.

To this end, the present invention is a soft switch 1 using the shape information of the soft switch 2, the first step of transmitting an OPTION message for checking the status to the soft switch 2; Soft switch 2 receiving the OPTION message is Transmitting a OPTION message for a status response to the soft switch 1 based on a status; And a third process of transmitting the call to the bypass soft switch when the soft switch 2 detects a call to be routed to the soft switch 2 when the soft switch 2 is abnormal.

Description

Softswitch with monitoring function for other softswitch and call distribution method using the same {Softswitch for monitoring different softswitch and call distribution method using the same}

1 is an overall configuration diagram of a conventional next generation communication network.

2 is a detailed configuration diagram of a soft switch having a monitoring function for another soft switch according to an embodiment of the present invention.

3 is a flowchart illustrating a call distribution method using a soft switch having a monitoring function for another soft switch according to an embodiment of the present invention.

The present invention relates to a soft switch having a monitoring function for another soft switch and a call distribution method using the same. More particularly, the present invention relates to a technique for efficiently distributing a call by monitoring a state of each other between soft switches using a SIP protocol. It is about.

Next Generation Network (NGN), which is implemented as a broadband network, simplifies the structure of different networks (PSTN, ATM, IR, FR, dedicated network, wireless network, etc.) into one common packet-based network. It is a network that adopts open exchange technology that defines voice and data integrated multimedia communication network in MSF, IPCC, etc. to provide saving and flexible network solution.

Since NGN is an Open Achitecture, it is possible to supply vendor independent facilities, develop and provide services through Open API, and to ensure independence in delivery layer technology. Can be. In addition, since NGN is a single transport network, it can provide multiservices such as voice / data / video communication, integrate various wired / wireless broadband media, unify operation management and maintenance systems, and The overlay network can be implemented as an integrated high speed packet network. In addition, NGN provides a Network Indepent Service, which can provide time to market services, provide independent services to suppliers through the Open API, and quickly introduce various types of services. It provides network flexibility by guaranteeing quality of service (QoS) / cost of service (CoS) for each service.

Referring to Fig. 1, the NGN configuration will be schematically described.

NGN is an access gateway 10 for receiving a variety of subscriber services, such as a general telephone, xDSL, leased line, all in a single system centered on the soft switch 20 to process in a packet manner; A trunk gateway 20 for performing STM or trunk interfacing between the PSTN and the packet network, establishing a local connection with the soft switch 20, and setting / managing transport connections through the packet network under the control of the soft switch 20; And an application server (not shown) that performs a function of providing an environment in which applications and additional services can be generated and executed.

As shown in FIG. 1, the access gateway 10 accommodates the POT terminal 2 and the PC terminal 4 via the modem 6, and also directly accepts the general POTS terminal 8, which includes a modem 6. Subscriber traffic transmitted through the soft switch 20 is transmitted, and the subscriber signal transmitted from the POTS terminal 8 is transmitted to the Public Switched Telephone Network (PSTN).

Between the access gateway and the soft switch 20, the router for performing the routing function for the IP packet based on the destination address and the NAS 12 to authenticate the subscriber to the router to deliver the IP packet to the soft switch 20 (14) is located.

The SIP terminal 18 is connected to the soft switch 20. The SIP terminal 18 is a terminal that performs a voice call through a packet network after performing a call connection using a SIP message.

On the other hand, if the interface between the soft switch in the broadband communication network is the SIP protocol, there is a problem that can not determine whether the service between the soft switch.

If the serviceable state between softswitches is not monitored, call processing may not be performed normally by routing the call to the corresponding softswitch even if the softswitch to be routed is not normal when any softswitch routes the call. .

Therefore, in order for a soft switch to efficiently process a call, it is necessary to monitor the operation state of another soft switch to which the soft switch is physically connected in real time.

The present invention was created in response to the above-described demands, and the present invention monitors the serviceable state between the other soft switches linked with one soft switch using an OPTION method, so that a soft switch having a failure occurs. It is an object of the present invention to provide a call distribution device and a call distribution method between soft switches in a broadband communication network capable of bypassing a call to be transmitted to the soft switch to a soft switch in a normal state.

SIP to be routed to a soft switch in a fault state by periodically performing a control for checking the status of a call distribution device and other physically connected soft switches in a broadband communication network according to an embodiment of the present invention for achieving the above object. SSM to divert calls; A SIPTR for generating an OPTION message to be transmitted to the soft switches for status checking and transmitting the soft switch to the soft switches, and sending a status response message transmitted from the soft switches to the SSM at the request of the SSM; And a SIP stack that supports SIP communication between the soft switches.

In addition, in the method for distributing calls between soft switches in a broadband communication network according to an embodiment of the present invention for realizing the above object, the soft switch 1 checks the state with the soft switch 2 using the shape information of the soft switch 2. Transmitting a OPTION message for the first step; A second step of transmitting, by the soft switch 2 receiving the OPTION message, an OPTION message for a status response to the soft switch 1 based on its status; And a third process of transmitting the call to the bypass soft switch when the soft switch 2 detects a call to be routed to the soft switch 2 when the soft switch 2 is abnormal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a detailed configuration diagram of a soft switch having a monitoring function for another soft switch according to an embodiment of the present invention.

The soft switch according to the embodiment of the present invention includes a soft switch status management (SSM) 21, a shape information storage unit 22, a SIP TR (SIP TRansaction) 23, and a SIP stack 24.

The shape information storage unit 22 stores information such as an IP address and a status check period of another soft switch that can be connected to the soft switch.

The SSM 21 performs a function of managing a service state of another switch switch through periodic status checks for each soft switch registered in the shape information storage unit 22.

The SIPTR 23 encodes / decodes a SIP message to generate a SIP SIP message, transmits the generated SIP message to another soft switch through the SIP stack 24, and sends the SIP stack 24 to the SIP stack 24. When the SIP message transmitted from the other softswitch is received, it is analyzed and transmitted to the SSM 21.

SIP stack 24 performs the function of performing SIP interfacing.

Next, a call distribution method between soft switches in a broadband communication network according to an embodiment of the present invention will be described in detail with reference to the block diagram of FIG. 2 and the signal flow diagram shown in FIG. 3.

On the basis of the shape information of the other soft switch stored in the shape information storage unit 22 of the soft switch 21, the other soft switches are requested by periodically transmitting the OPTION message to the soft switch to be monitored by the SIPTR 23. Request status check for (S2).

In response to the OPTION message transmission request, the SIPTR 23 generates an OPTION message for checking the status and transmits the generated OPTION message to the soft switch (for example, 40) to be monitored through the SIP stack 24 (S4, S6).

In the present invention, the svc-state tag is defined among the options of the Require and Supported headers of the OPTION method defined and used in the standard without defining a new SIP method.

The OPTION message transmitted to the sort switch 40 is as follows.

OPTIONS sip: ssw2.ktngn.com SIP / 2.0

  Via: SIP / 2.0 / UDP ssw1.ktngn.com

From: <sip: ssw1.ktngn.com>; tag = 2254c2254

To: <sip: ssw2.ktngn.com>                     

Call-Id: 973573394-options@ssw1.ktngn.com

Cseq: 1 OPTIONS

Contact: <sip: ssw1.ktngn.com>

Require: svc-state

Content-Length: 0

As described above, the OPTION message for using the OPTION method implements "Require: svc-state" to query the state of the soft switch.

The OPTION message is transmitted to the SIPTR 43 through the SIP stack 44 of the other soft switch 40 (S8).

The SIPTR 43 analyzes the OPTION message, confirms that the OPTION message is a status confirmation request message, and requests the SSM 41 to check the status (S9).

In response to the request, when the SSM 41 confirms the operation state, and then transmits a status acknowledgment to the SIPTR 43 (S10), the SIPTR 43 analyzes the status acknowledgment and the corresponding soft switch 40 Generates a status response message for notifying the sort switch 20 of the operation status.

At this time, the generated status response message is as follows.

SIP / 2.0 200 OK

Via: SIP / 2.0 / UDP pc33.atlanta.com; branch = z9hG4bKhjhs8ass877

; received = 11.0.0.106

From: <sip: ssw1.ktngn.com>; tag = 2254c2254                     

To: <sip: ssw2.ktngn.com>; tag = 93810874

Call-Id: 973573394-options@ssw1.ktngn.com

Cseq: 1 OPTIONS

Contact: <sip: ssw1.ktngn.com>

Supported: svc-state

Content-Type: application / sdp

Content-Length: 274

(SDP not shown)

As described above, the status response message includes a "Supported: svc-state" header. If the operation state of the soft switch is normal, the message "200 OK" is transmitted. 420 Bad Extention "or other error response message is sent.

The soft switch 40 described with reference to FIG. 3 has a normal operation state, and thus a case in which a 200 OK message is transmitted from the soft switch 40 will be described as an embodiment.

Meanwhile, when a 200 OK message is transmitted through the SIP stack 24 of the soft switch 20, the 200 OK message is transmitted to the SIPTR 23 (S14).

The SIPTR 23 analyzes the 200 OK message, checks the normal state of the soft switch 40 transmitting the 200 OK message, and responds to the SSM 21 (S16).

The SSM 21 stores in the shape information storage unit 22 that the soft switch 40 is in a normal state, thereby completing the state checking procedure for the soft switch 40.                     

The soft switch 40 of the present invention periodically transmits an OPTION message for checking the status of all soft switches that can be physically connected, collects the status check results of the corresponding soft switches, and then displays the collected status check results. On the basis of this, routing is performed during call processing.

The soft switch 40 manages the service state management table of other soft switches, as shown in [Table 1], and manages the state of each soft switch and a bypass soft switch that will bypass traffic for a call setup request when a failure occurs.

TABLE 1

Softswitch number condition Bypass softswitch number 2 svc 3 3 svc 4 4 oos (out of service) 5 5 svc 6

Accordingly, the soft switch 40 is transmitted to the soft switch 4, which is the bypass soft switch, to be transmitted to the soft switch 4, which is confirmed to be out of service.

According to the present invention as described above, when the interface between the soft switch is the SIP protocol, it is possible to determine the service state of the other soft switch using the OPTION method.

Therefore, the present invention has an effect that the SIP call routed to the soft switch can be bypassed by the bypass soft switch when the other soft switch is in the unserviceable state, thereby efficiently processing the SIP call.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (10)

An SSM which periodically performs control for status checking on other physically connected soft switches, thereby bypassing a SIP call to be routed to a soft switch in a faulty state; A SIPTR for generating an OPTION message to be transmitted to the soft switches for status checking and transmitting the soft switch to the soft switches, and sending a status response message transmitted from the soft switches to the SSM at the request of the SSM; And Soft switch having a monitoring function for the other soft switch, characterized in that configured to the SIP stack to support the SIP communication between the soft switch. The method of claim 1, wherein the SIPTR is And a svc-state tag defined in the Require header of the OPTION message to generate an OPTION message for checking the status of the OPTION message. The method of claim 1, wherein the SSM is When the OPTION message for the status check is transmitted from the other soft switch, the status response message is generated based on the current state, and the status response message is controlled to be transmitted to the other soft switch. Soft switch with function. 4. The method of claim 3, wherein the SIPTR is A softswitch having a monitoring function for another softswitch, characterized by generating a status response message by defining svs-state tqg of the Supported header of the OPTION message. The method of claim 1, wherein the soft switch Soft switch having a monitoring function for the other soft switch, characterized in that the shape information for the other soft switch, and the information about the bypass soft switch for the other soft switch. A first step of the soft switch 1 transmitting an OPTION message for checking the status to the soft switch 2 using the shape information of the soft switch 2; A second step of transmitting, by the soft switch 2 receiving the OPTION message, an OPTION message for a status response to the soft switch 1 based on its status; And If the soft switch 1 detects a call to be routed to the soft switch 2, if the soft switch 2 is abnormal, and monitoring the other soft switch characterized in that it comprises a third process for transmitting the call to the bypass soft switch Call distribution method using soft switch with function. The method of claim 6, wherein the soft switch 1 A method for distributing a call using a soft switch having a monitoring function for another soft switch, wherein shape information of all soft switches that are physically connectable is stored. The method of claim 7, wherein The soft switch periodically performs the first to second processes for all the soft switches using the shape information. When a call arrives, check the state of the soft switch to route the call, If the corresponding soft switch is abnormal, the call distribution method using a soft switch having a monitoring function for the other soft switch, characterized in that it further comprises the step of bypassing the call with the bypass soft switch in the normal state. The method of claim 6 to 8, wherein the OPTION message of the first process A call distribution method using a soft switch having a monitoring function for another soft switch, characterized in that the svc-state tag of the Require header of the OPTION message is defined. The method of claim 6, wherein the OPTION message of the second process A call distribution method using a softswitch having a monitoring function for another softswitch, characterized in that the svs-state tqg of the Supported header is defined.

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