KR101105087B1 - Method of connecting mobile VoIP Call when mobile terminal can not be answered - Google Patents

Abstract

The present invention relates to a method of connecting a call when the called terminal is not available in the mVoIP network, when the mVoIP called terminal is located in the shadow area, or when the mobile Internet modem is in an idle state, or the power of the mVoIP called terminal is If the mVoIP destination is not available, such as when it is off or when a call connection request message is delayed, the shadow forwarding service is activated so that another phone number preset by the subscriber (other calls on the same device) In an mVoIP network, a call connection method is provided when a called terminal is not available in an mVoIP network.
To this end, the present invention provides a call connection method when the called terminal is not available, when the application server receives the first connection request message requesting a call connection to the called number registered in the shadow call forwarding service, waiting for a predetermined response Setting a time and sending the first call connection request message to an incoming CSCF; Confirming, by the application server, whether a call available message or a temporary call unavailable message is received from the incoming CSCF within the predetermined response waiting time; As a result of the checking, when the call possibility message is received from the called CSCF within the predetermined response waiting time, requesting for the connection of the incoming call by the application server; And if the temporary call unavailable message is not received or no message is received from the incoming CSCF within the predetermined response waiting time, the application server starts the shadow call forwarding service to register the registered shadow forwarding phone number. And searching for the call forwarding call forwarding the second call connection request message to the called CSCF, the call forwarding step for requesting a call connection to the retrieved shaded call forwarding telephone number.

Description

Method of connecting mobile VoIP Call when mobile terminal can not be answered}

The present invention relates to a method of connecting a call when the called terminal is not available in a mobile voice over Internet Protocol (mVoIP) network. Regarding the call connection method when the called terminal is not available in the mVoIP network for connecting the call by transferring the call to another telephone number set by the subscriber in advance (other call network number of the same terminal or phone number of another terminal) will be.

In the present invention, when the mVoIP destination terminal is not possible to receive, when the mVoIP destination terminal is located in a shaded area out of the mobile Internet coverage, or when the mobile Internet modem is in an idle state, or the power of the mVoIP destination terminal Is turned off, or the call connection request message (INVITE message) is delayed due to the excessive traffic of the base station.

In the present invention, when the mVoIP destination terminal is located in the shadow area outside the coverage of the mobile Internet, when the mVoIP destination terminal is located in the shadow area and there is no response to the call connection request message from the mVoIP destination terminal, or mVoIP reception It includes a case where the terminal is located in the shadow area and is in an unregistered state in an IMS (IP Multimedia Subsystem) / HSS (Home Subscriber Server).

In addition, the mVoIP terminal in one embodiment of the present invention below is not only a single mode mVoIP terminal that can access the portable Internet network, but also other mobile communication network (for example, CDMA or W-CDMA or next-generation wireless communication network, etc.) MVoIP terminal or a tri-mode mVoIP terminal and the like that can be connected to all).

In the following embodiment of the present invention, when the mVoIP destination terminal is not available, the service for the call forwarding to another phone number set in advance by the subscriber (other phone number of the same terminal or phone number of the other terminal) It will be referred to as "shading call forwarding service".

In the prior art, when an mVoIP terminal registered in a call session control function (CSCF) normally moves to a shadow area, when there is an incoming request to the mVoIP terminal, the CSCF sends a call connection request message (INVITE message) to the mVoIP destination terminal. send.

However, since the mVoIP called terminal is located in the shadow area, the mVoIP called terminal does not receive the call connection request (INVITE) message, and accordingly, the CSCF determines that there is no response from the mVoIP called terminal to the call connection request message. Release the call request.

Therefore, even if the call forwarding service is registered in advance for the mVoIP terminal, the call forwarding service does not operate, and there is a problem that call forwarding is not performed for the call forwarding request.

As described above, the prior art as described above has a problem that the call forwarding service does not operate when the mVoIP called terminal is not available, the call forwarding for the corresponding call request is not made, to solve this problem It is a subject of the present invention.

Therefore, in the present invention, even when the mVoIP called terminal cannot receive the call, the shadow call forwarding service is operated so that the call can be made by another telephone number set by the subscriber in advance (another phone number of the same terminal or a phone number of another terminal). An object of the present invention is to provide a call connection method when an incoming terminal cannot receive a call in an mVoIP network to connect a call by transferring a call.

That is, according to the present invention, when the mVoIP destination terminal is located in a shaded area, when the mobile Internet modem is in an idle state, or when the mVoIP destination terminal is powered off, or the call connection request message is delayed Even if the mVoIP called terminal is unable to receive the call, the call forwarding service is activated and the call is made with another phone number set previously by the subscriber (another phone number of the same terminal or a phone number of another terminal). An object of the present invention is to provide a call connection method when an incoming terminal cannot receive a call in an mVoIP network to connect a call by transferring a call.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In the method of the present invention for achieving the above object, in the call connection method when the incoming terminal is not available, the application server receives the first call connection request message to request a call connection to the called number registered in the shadow call forwarding service Setting a predetermined response waiting time and transmitting the first call connection request message to an incoming CSCF; Confirming, by the application server, whether a call available message or a temporary call unavailable message is received from the incoming CSCF within the predetermined response waiting time; As a result of the checking, when the call possibility message is received from the called CSCF within the predetermined response waiting time, requesting for the connection of the incoming call by the application server; And if the temporary call unavailable message is not received or no message is received from the incoming CSCF within the predetermined response waiting time, the application server starts the shadow call forwarding service to register the registered shadow forwarding phone number. And searching for the call forwarding call forwarding the second call connection request message to the called CSCF, the call forwarding step for requesting a call connection to the retrieved shaded call forwarding telephone number.

On the other hand, according to another method of the present invention, in the method of connecting a call when the called terminal is not available, when the calling CSCF receives the first call connection request message from the calling terminal, the called terminal obtains the called CSCF accommodated by the called terminal and the first call is received. Sending a call connection request message; The called CSCF transmitting the first call connection request message to an application server by confirming that the called terminal is a subscriber registered with a shadow call forwarding service; When the application server sets a predetermined response waiting time and transmits the first call connection request message to the called CSCF, transmitting the first call connection request message to the called terminal by the called CSCF; Checking, by the application server, whether there is a response from the called terminal within the set response waiting time; As a result of the checking, when the called terminal is unresponsive, the application server drives the shaded call forwarding service to transmit a "notification message during retransmission to the called call forwarding telephone number" to the calling terminal through the called CSCF and the calling CSCF. Making; Transmitting, by the application server, a second call connection request message to the called CSCF to forward the call to a call forwarding terminal that is previously registered in the shadow call forwarding service; And the called CSCF requesting a call connection by transmitting a second call connection request message to the call forwarding terminal by checking a system in which the call forwarding terminal is accommodated.

On the other hand, another method of the present invention, in the call connection method when the incoming terminal is not available, when the originating CSCF receives the first call connection request message from the originating terminal, the called terminal to obtain the incoming CSCF accommodated by the called terminal; Transmitting a call connection request message; The called CSCF transmitting the first call connection request message to an application server by confirming that the called terminal is a subscriber registered with a shadow call forwarding service; Setting, by the application server, a predetermined response waiting time and transmitting the first call connection request message to the called CSCF; When the called CSCF checks the current state of the called terminal and determines that the called terminal cannot make a call temporarily, transmitting a temporary call unavailable message to the application server; When the application server receives the temporary call unavailable message, driving the shadow forwarding service to transmit a "notification message during retransmission to a forwarding phone number" to the calling terminal through the called CSCF and the calling CSCF; Transmitting, by the application server, a second call connection request message to the called CSCF to forward the call to a call forwarding terminal that is previously registered in the shadow call forwarding service; And the called CSCF requesting a call connection by transmitting a second call connection request message to the call forwarding terminal by checking a system in which the call forwarding terminal is accommodated.

According to the present invention, when the mVoIP destination terminal is located in a shaded area, or when the mobile Internet modem is in an idle state, or when the power of the mVoIP destination terminal is turned off, or the call connection request message is delayed ( Even if the mVoIP called terminal cannot receive the call, such as when a call is delayed, the shadow call forwarding service is activated so that the subscriber sets a different phone number that has been previously set up (registered). Number) and the call is transferred to the call.

Accordingly, the present invention can improve the success rate of the call, thereby improving the convenience of the subscriber as well as increase the mVoIP call revenue of the telecommunications operator.

1 is an exemplary diagram of an IMS-based mVoIP network to which the present invention is applied;
2 is a flowchart illustrating a signal processing procedure when a called terminal registered to a shadow call forwarding service normally responds to an incoming call according to an embodiment of the present invention;
3 is a flowchart illustrating a signal processing procedure when a called terminal registered to a shadowed call forwarding service according to an embodiment of the present invention is unanswered to an incoming call;
4 is a flowchart illustrating a signal processing procedure when a called terminal registered to a shadow call forwarding service according to an embodiment of the present invention is in a deregistered state or temporarily unable to make a call;
5 is a flowchart illustrating a call connection method when a called terminal cannot receive a call in an mVoIP network according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

And throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between. Also, when a component is referred to as " comprising "or" comprising ", it does not exclude other components unless specifically stated to the contrary .

1 is a diagram illustrating an IMS-based mVoIP network to which the present invention is applied.

As shown in FIG. 1, an IMS-based mVoIP network to which the present invention is applied consists of a mobile Internet (WiBro) network and an IMS network by way of example. It can provide VoIP-based call services (eg, voice call service, video call service) to the terminal.

In this case, the portable Internet network may include an mVoIP terminal, a base station (RAS), a base station controller (ACR: access control router), a terminal access authentication function, and a charging information collection function for packet charging. Authorization, Accounting) servers (not shown) and the like, and the IMS network includes Proxy-Call Session Control Function (P-CSCF), Interrogating-CSCF (I-CSCF), and Serving-CSCF (S-CSCF). It includes CSCF, PCRF (Policy and Charging Rule Function, also known as QoS Manager (QM)), including the application server (AS), MGCF (Media Gateway Control Function) for providing IMS application services, including.

In addition, MGW for interworking with IMS network and other networks (mobile communication network and wired telephone network) is provided. Although not shown in the drawing, the IMS network includes HSS (Home Subscriber Server) for voice service authentication and data additional service authentication. HDS (Home Digital Service) is further provided.

The mobile communication network (WCDMA, CDMA, GSM) linked to the IMS network includes an MSC, a BSC, a BTS, a mobile communication terminal, and the like, and a wired telephone network (PSTN) includes an exchanger and a wired telephone.

Next, the components will be described in more detail.

The Call Session Control Function (CSCF) is a system in charge of a part related to call processing among functions of the IMS, and includes an incoming call gateway (ICGW), a call control function (CCF), a serving profile database (SPD), and an address handling (AH). )

Here, the incoming call gateway (ICGW) operates as the first entry point and performs routing for the input call. In addition, ICGW performs service triggering on input calls such as call screening and forwarding, and inquires about address handling (AH) and communication with Home Subscriber Server (HSS).

The CCF (Call Control Function) is responsible for call setup and termination, status / event management, interaction with multimedia resource functions (MRF) for multiparty services, call event reporting for billing, and reception and processing of application level registrations. .

The Serving Profile Database (SPD) manages user profile information by communicating with the HSS of the home domain, and performs a function similar to the VLR (Visitor Location Register) of the existing network that informs the home domain of the user's first access.

Address handling (AH) performs the function of parsing, translating, and modifying addresses, and provides address portability.

Since the Call Session Control Function (CSCF) performs different functions depending on the network where the subscriber is located, the Proxy-CSCF (P-CSCF), Interrogating CSCF (I-CSCF), and S- Logically divided into CSCFs (Serving CSCFs), for example, the function of guaranteeing the Quality of Service (QoS) in conjunction with the PCRF is performed in the P-CSCF.

On the other hand, PCRF (Policy and Charging Rule Function) is a system that provides service-based quality of service (QoS) policy setting function and flow-based charging rule (QoS) function. It collects basic service information, verifies the authority of the service according to the policy decision of the network operator, and delivers the quality assurance (QoS) policy and the charging policy to allocate network bandwidth to the network access system.

Meanwhile, a base station controller (ACR: Access Control Router) refers to a component that controls a terminal (mVoIP terminal) and a base station (RAS) and routes IP packets in a portable Internet network.

From the standpoint of data traffic, the base station controller (ACR) can be viewed as a router (access control router), and manages several base stations (RAS) underneath.

The base station controller (ACR) processes air interface control signals, bearer service traffic, and the like between a radio access station (RAS) and a core network (Core Network).

And base station controller (ACR) is interworking function with base station (RAS), call connection setting function, location management (mobility management) function of wireless terminal (mVoIP terminal), authentication and security function, charging and statistics Creates and notifies information and manages IP QoS.

On the other hand, a base station (RAS: Radio Access Station) refers to a portable Internet network component that terminates a wired network and transmits and receives a wireless terminal (mVoIP terminal) through a wireless interface.

Looking at the type by function, the serving base station (Serving RAS) is a base station that the mobile terminal is currently being serviced, a base station that has recently registered a wireless terminal (mVoIP terminal). The target base station (Target RAS) is a destination base station to be handed over by a wireless terminal (mVoIP terminal), and a base station to which a wireless terminal (mVoIP terminal) intends to register at the end of the handover. Neighbor RAS refers to a base station adjacent to the serving base station. In addition, there are a detected base station (Detected RAS), a selected base station (Selected RAS).

And the base station (RAS) is a radio signal transmission and reception function, modulation and demodulation signal processing function, packet retransmission function, packet scheduling function, radio bandwidth allocation function, ranging function, connection control functions such as packet call connection establishment / maintenance / release, and hand It performs over control function.

The main requirements of the base station (RAS) are frequency efficiency, transmission speed in terms of service, QoS parameters (jitter, latency, packet loss rate, transmission rate, etc.), handover, and the like.

Meanwhile, a media gateway (MGW) refers to a device that performs media processing and conversion between a circuit switched network and a packet switched network. That is, the media gateway MGW converts a voice signal in the form of a packet (IP packet, etc.) made in the Internet into a PCM or the like used in a public telephone network (wired telephone network) or vice versa.

In addition, the media gateway (MGW) has a function of converting a compressed signal for packetization of a voice signal or vice versa, an echo cancellation function of a voice caused by a delay, a reception of a digit, and a forwarding function of a fax. It converts TDM-based traffic into IP or ATM packets.

The media gateway is linked with a soft switch and a control protocol for call control between the media gateways.

In addition, the types are classified according to the interface type and the location where they are arranged. The Access Media Gateway supports access to a packet switched network such as VoIP in a private switched network. The trunk media gateway connects the circuit switched network with the packet switched network. The Residential Media Gateway also provides an analog line in the home with access to the packet network.

Meanwhile, MGCF (Media Gateway Control Function) refers to a network element that controls multiple media gateways from the outside to enable intelligent call control.

To implement this, call processing with the existing circuit network is connected to MGCF through SGW (Signalling Gateway) to perform call processing control function, and control the media gateway (MGW: Media Gateway) to be connected by translating call number in MGCF. It assigns IP addresses / UDP ports (User Datagram Protocol Ports) to be connected between media gateways, and manages the corresponding resources such as compression necessary to make IP packets from end to end, thereby interconnecting voice traffic delivered to media gateways.

In addition, MGCF is a concept that separates the signaling network and the transmission network by No. 7 structure like the existing PSTN / N-ISDN on the Internet, and is also called a softswitch or call agent.

2 is a flowchart illustrating a signal processing procedure when a called terminal registered to a shadowed call forwarding service normally responds to an incoming call according to an embodiment of the present invention.

First, the originating terminal A forwards a call connection request (INVITE B) message for connecting a call to the called terminal B (terminal registered in the call forwarding service) to the calling CSCF (201), and in response thereto, from the calling CSCF. Receive a 100 Trying message (202).

In the outgoing CSCF, the called terminal B acquires the received incoming CSCF and transmits an INVITE B message to the called CSCF (203), and receives a 100 Trying message from the called CSCF in response. (204)

In addition, the called CSCF determines that the called terminal B is a subscriber registered with the shadow call forwarding service, and transmits a call connection request (INVITE B) message to the application server (AS: Application Server) (205). A 100 Trying message is received from the AS (206).

The application server (AS) starts the shadow call forwarding timer and sends an INVITE B message back to the incoming CSCF (207), and receives a 100 Trying message from the incoming CSCF in response. (208).

The destination CSCF forwards the call connection request (INVITE B) message received from the application server (AS) to the destination terminal B (209), whereby the destination terminal B rings and a 180 ringing message. The callable message is forwarded to the incoming CSCF (210).

Then, the incoming CSCF forwards the 180 ringing message to the application server AS (211), and the application server AS forwards the 180 ringing message back to the destination CSCF (212). . At this time, the application server AS determines whether a 180 ringing message is received in response to the INVITE B message within a predetermined response waiting time (within the response waiting time set in the call forwarding timer). Check to see if the called terminal B responds. At this time, the application server AS determines that the called terminal B can receive the call if there is a response from the called terminal B within the predetermined response waiting time.

The called CSCF forwards the 180 ringing message to the calling CSCF if the called terminal B can receive the call (213), and accordingly, the calling CSCF forwards the 180 ringing message to the calling terminal A (214). ).

When the called party answers the call [Hook-Off], the called terminal B transmits a call connection response (200 OK) message to the called CSCF in response to the INVITE B message (215).

Then, the incoming CSCF forwards the call connection response 200 OK message to the application server AS 216, and accordingly, the application server AS forwards the call connection response 200 OK message back to the destination CSCF ( 217). The incoming CSCF forwards the call connection response (200 OK) message to the calling CSCF (218), and accordingly the calling CSCF forwards the call connection response (200 OK) message to the calling terminal A (219).

Accordingly, a call path is established between the calling terminal A and the called terminal B to make a call (220).

3 is a flowchart illustrating a signal processing procedure when a called terminal registered to a shadowed call forwarding service according to an embodiment of the present invention does not respond to an incoming call.

First, the originating terminal A forwards a call connection request (INVITE B) message for connecting the call to the called terminal B (terminal registered in the call forwarding service) to the calling CSCF (301), and in response, from the calling CSCF. Receive a 100 Trying message (302).

In the outgoing CSCF, the called terminal B acquires the received incoming CSCF and transmits an INVITE B message to the called CSCF (303), and receives a 100 Trying message from the called CSCF in response. (304)

In addition, the called CSCF determines that the called terminal B is a subscriber registered with the shadow call forwarding service, and transmits a call connection request (INVITE B) message to an application server (AS) (305), in response to the application server. A 100 Trying message is received from the AS (306).

The application server (AS) starts the shadow call forwarding timer and sends a call connection request (INVITE B) message back to the incoming CSCF (307), and receives a 100 Trying message from the incoming CSCF in response. (308)

The called CSCF forwards the INVITE B message received from the application server AS to the called terminal B. However, the called terminal B is located in the shadow area and the INVITE message is sent to the called terminal B. (309) Accordingly, the called CSCF does not receive the 180 ringing message from the called terminal B, and also does not transmit the 180 ringing message to the application server AS.

On the other hand, the application server AS, after the call connection request (INVITE B) message of the "307" process, the call connection request from the incoming CSCF within the predetermined response waiting time (within the response waiting time set in the call forwarding timer) In response to the INVITE B) message, it is checked whether a 180 ringing message is received to determine whether the called terminal B responds. At this time, the application server AS determines that the called terminal B is impossible to receive in the shaded area if there is no response from the called terminal B during the predetermined response waiting time. Accordingly, the application server AS drives the shadow forwarding service (310) to deliver a "181 Call is being forwarded message to the forwarding CSCF" to the incoming CSCF (310), and accordingly The CSCF forwards the "181 Call is being forwarded message to the forwarding phone number" message to the outgoing CSCF (312), whereby the outgoing CSCF sends the "181 Call is being forwarded to the forwarding phone number." Message) to the originating terminal A (313). Accordingly, the calling subscriber waits without hanging up.

In the application server (AS), if the called terminal B is unanswered in the shadow area as described above, the call is connected to the called CSCF to transfer the call to the terminal (called terminal C) registered in the shadow call forwarding service in advance. It forwards a request (INVITE C) message (314) and receives (315) a 100 Trying message from the incoming CSCF in response.

In addition, the called CSCF checks the system (MGCF, other CSCF, etc.) accommodated by the called terminal C, and transmits a call connection request (INVITE C) message to the called terminal C through the corresponding system (316).

When the called party receives a call [Hook-Off], the called terminal C transmits a call connection response (200 OK) message to the called CSCF in response to the INVITE C message (317).

Then, the incoming CSCF forwards the call connection response 200 OK message to the application server AS (318), and thus the application server AS forwards the call connection response 200 OK message back to the destination CSCF ( 319). The incoming CSCF forwards the call connection response (200 OK) message to the calling CSCF (320), and accordingly, the calling CSCF forwards the call connection response (200 OK) message to the calling terminal A (321).

Accordingly, a call path is established between the calling terminal A and the called terminal C to make a call (322).

4 is a flowchart illustrating a signal processing procedure when a called terminal registered to a shadow call forwarding service according to an embodiment of the present invention is in a deregistered state or temporarily unable to make a call.

First, the calling terminal A transmits a call connection request (INVITE B) message for connecting a call to the called terminal B (the terminal registered with the call forwarding service) to the calling CSCF (401), and in response thereto, from the calling CSCF. Receive a 100 Trying message (402).

In the outgoing CSCF, the called terminal B acquires the received incoming CSCF and transmits an INVITE B message to the called CSCF (403), and receives a 100 Trying message from the called CSCF in response. (404).

In addition, the called CSCF determines that the called terminal B is a subscriber registered with the shadow call forwarding service, and transmits a call connection request (INVITE B) message to an application server (AS) (405), and in response, the application server. A 100 Trying message is received from the AS (406).

In operation 407, the application server AS starts the shadow forwarding timer and transmits a call connection request (INVITE B) message to the incoming CSCF.

Then, the incoming CSCF receiving the call connection request (INVITE B) message from the application server (AS) checks the current state of the called terminal B, and if it is determined that the called terminal B is temporarily unable to make a temporary call ( A message 480 is sent 408 to the application server AS. Here, the state in which the called terminal B cannot make a call temporarily includes a case where the called terminal B is located in a shadowed area and the registration is released from the CSCF, or the called terminal B cannot make a call for other reasons.

If the application server (AS) receives a 480 Temporarily Unavailable message in response to a call connection request (INVITE B) message of step 407, the application server AS starts a call forwarding service (409). Forward 181 Call is being forwarded message to the incoming CSCF (410), whereby the incoming CSCF sends a "181 Call is being forwarded message" to the forwarding phone number. Forwarding to the CSCF (411), and accordingly the originating CSCF forwards the "181 Call is being forwarded message to the forwarding phone number" message to the calling terminal A (412). Accordingly, the calling subscriber waits without hanging up.

In the application server AS, the incoming CSCF is used to transfer the call to the terminal (called terminal C) registered in the shadow forwarding service in advance when the called terminal B is temporarily unavailable in the shadow area. It forwards a call connection request (INVITE C) message (413), and receives a 100 Trying message from the incoming CSCF in response (414).

In addition, the called CSCF checks the system (MGCF, other CSCF, etc.) accommodated by the called terminal C, and transmits a call connection request (INVITE C) message to the called terminal C through the corresponding system (415).

When the called subscriber receives a call [Hook-Off], the called terminal C transmits a call connection response (200 OK) message to the called CSCF in response to the INVITE C message (416).

Then, the incoming CSCF forwards the call connection response 200 OK message to the application server AS 417, and accordingly, the application server AS forwards the call connection response 200 OK message back to the incoming CSCF ( 418). The incoming CSCF forwards the call connection response (200 OK) message to the calling CSCF (419), and accordingly the calling CSCF forwards the call connection response (200 OK) message to the calling terminal A (420).

Accordingly, a call path is established between the calling terminal A and the called terminal C to make a call (421).

5 is a flowchart illustrating a method for connecting a call when a called terminal is not available in an mVoIP network according to an embodiment of the present invention.

First, when the called CSCF receives an INVITE B message from the calling terminal A through an outgoing CSCF for connecting a call to a called terminal B (a terminal registered in the call forwarding service) (501), the HSS (Home) Subscriber Server) to query the caller profile (502) to determine whether the caller ID registered in the shadow call forwarding service (shaded call forwarding registration number) (503).

As a result of the checking (503), if the called number is not registered in the shadow call forwarding service, the call processing proceeds in a known conventional manner (504), and if the called number is registered in the shadow call forwarding service, the incoming CSCF is applied. A call connection request (INVITE B) message is transmitted to the server (AS: Application Server) (505). Accordingly, the application server (AS) receives a call connection request (INVITE B) message from the incoming CSCF (506).

Then (when receiving a call connection request (INVITE B) message from the incoming CSCF), the application server (AS) starts the shadow call forward timer (T1: specified response wait time) (507) and the call connection request (INVITE) to the incoming CSCF B) forward the message (508).

Subsequently, the application server AS sends a call connection request from the incoming CSCF within a predetermined response waiting time (within the response waiting time set in the shaded call forwarding timer) after the call of the "508" call connection request message (INVITE B). INVITE B) It is checked whether the called terminal B responds by checking whether a 180 ringing message (callable message) or a 480 Temporarily Unavailable message is received in response to the message (509, 510). .

As a result of the check (509, 510), if a 180 Ringing message is received within a predetermined response waiting time (that is, when there is a normal response from the destination terminal B for the incoming call), the application server (AS) is a shadow incoming The transfer timer T1 is stopped (511) and a 180 ringing message is transmitted to the called CSCF (512). The call processing between the calling terminal A and the called terminal B is performed (513).

On the other hand, as a result of the check 509, 510, a message 480 Temporarily Unavailable is received within a predetermined response waiting time (that is, when the called terminal B is deregistered or temporarily unavailable), If no message is received within the designated response waiting time (that is, the called terminal B is not answered to the incoming call), the application server AS stops the shadow call forwarding timer T1 and starts the shadow call forwarding service ( 514) transmits the message "181 Call is being forwarded" to the forwarding CSCF to the forwarding phone number (515).

In the application server (AS), if the called terminal B is deregistered, temporarily unable to make a call, or does not answer the incoming call, the application server AS transmits the call to the terminal (called terminal C) registered in advance in the shadow call forwarding service. In order to forward the call, the subscriber's database retrieves the registered shadow forwarding phone number (the phone number of the called terminal C) (516) and the call connection request (INVITE C) serves as the incoming shadow forwarding phone number. In step 518, the message is transmitted to the called CSCF and the call processing between the calling terminal A and the called terminal C is performed (518).

On the other hand, in the mVoIP system according to the present invention as described above, the call connection method when the incoming terminal can not be received is implemented in the form of program instructions that can be executed by various computer means may be recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Various permutations, modifications and variations are possible without departing from the spirit of the invention.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the appended claims.

The present invention can be used in the mVoIP network, such as a call connection when the called terminal is not available.

Claims (4)

In the call connection method when the incoming terminal is not available,
When the application server receives the first call connection request message requesting a call connection to the forwarding number registered in the shadow call forwarding service, setting a predetermined response waiting time and transmitting the first call connection request message to the called CSCF ;
Confirming, by the application server, whether a call available message or a temporary call unavailable message is received from the incoming CSCF within the predetermined response waiting time;
As a result of the checking, when the call possibility message is received from the called CSCF within the predetermined response waiting time, requesting for the connection of the incoming call by the application server; And
As a result of the check, if the temporary call unavailable message is not received or no message is received from the incoming CSCF within the predetermined response waiting time, the application server starts the shadow forwarding service to register a registered shadow forwarding phone number. After the retrieval, the shadow call forwarding step of requesting a call connection to the retrieved shaded call forwarding number by transmitting a second call connection request message to the called CSCF.
When the incoming call of the incoming terminal comprising a call connection method.
The method of claim 1,
The shadow forwarding call connection step,
As a result of the checking, if the temporary call unavailable message is received from the incoming CSCF or no message is received within the predetermined response waiting time, the application server releases the predetermined response waiting time and starts the shadow forwarding service. Sending a “notification message during retransmission to forwarding phone number” to the called CSCF;
Searching, by the application server, the registered shadow forwarding phone number in a database (DB) to forward the call to a call forwarding terminal previously registered in the shadow forwarding service; And
Requesting a call connection between an originating terminal and the call forwarding terminal by transmitting the second call connection request message having the retrieved shaded call forwarding phone number to the called CSCF;
When the incoming call of the incoming terminal comprising a call connection method.
In the call connection method when the incoming terminal is not available,
When the calling CSCF receives the first call connection request message from the calling terminal, acquiring the called CSCF by the called terminal to transmit the first call connection request message;
The called CSCF transmitting the first call connection request message to an application server by confirming that the called terminal is a subscriber registered with a shadow call forwarding service;
When the application server sets a predetermined response waiting time and transmits the first call connection request message to the called CSCF, transmitting the first call connection request message to the called terminal by the called CSCF;
Checking, by the application server, whether there is a response from the called terminal within the set response waiting time;
As a result of the checking, when the called terminal is unresponsive, the application server drives the shaded call forwarding service to transmit a "notification message during retransmission to the called call forwarding telephone number" to the calling terminal through the called CSCF and the calling CSCF. Doing;
Transmitting, by the application server, a second call connection request message to the called CSCF to forward the call to a call forwarding terminal that is previously registered in the shadow call forwarding service; And
The called CSCF checking a system in which the call forwarding terminal is accommodated and transmitting a second call connection request message to the call forwarding terminal to request a call connection;
When the incoming call of the incoming terminal comprising a call connection method.
In the call connection method when the incoming terminal is not available,
When the calling CSCF receives the first call connection request message from the calling terminal, acquiring the called CSCF by the called terminal to transmit the first call connection request message;
The called CSCF transmitting the first call connection request message to an application server by confirming that the called terminal is a subscriber registered with a shadow call forwarding service;
Setting, by the application server, a predetermined response waiting time and transmitting the first call connection request message to the called CSCF;
When the called CSCF checks the current state of the called terminal and determines that the called terminal cannot make a call temporarily, transmitting a temporary call unavailable message to the application server;
When the application server receives the temporary call unavailable message, driving the shadow forwarding service to transmit a "notification message during retransmission to a forwarding phone number" to the calling terminal through the called CSCF and the calling CSCF;
Transmitting, by the application server, a second call connection request message to the called CSCF to forward the call to a call forwarding terminal that is previously registered in the shadow call forwarding service; And
The called CSCF checking a system in which the call forwarding terminal is accommodated and transmitting a second call connection request message to the call forwarding terminal to request a call connection;
When the incoming call of the incoming terminal comprising a call connection method.

Images