KR20030027466A - Method and apparatus for forwarding call in ip-pcx - Google Patents

Abstract

PURPOSE: A call forwarding apparatus in a PBX(Private Branch Exchanger) providing an Internet phone service and a method therefor are provided to reduce a facility cost of a PBX with a supplementary function by performing no answer call forwarding between Internet phones, a busy call forwarding and an unconditional call forwarding only according to definition between an H323 protocol and an Internet phone. CONSTITUTION: An Internet phone 1 transmits an ARQ signal to gate keeper(201). The gate keeper requests ARQ from an originating extension unit(203). The originating extension unit occupies an extension and requests a destination extension unit to occupy a destination extension 1(205). The destination extension unit requests the gate keeper to occupy the destination extension 1(207). The gate keeper transmits ACF(Admission Confirmation) signal to the Internet phone(209). The Internet phone 1 sets up a set-up message(211). The gate keeper sets up a call with the Internet phone(213). The destination extension unit transmits a response signal informing of the occupancy of the destination extension 1 to the originating extension unit(215). The destination extension unit transmits a ring signal to the gate keeper(217). The gate keeper transmits the ring signal to the Internet phone 1 for user's listening to a ring back tone(219) and to an Internet phone 2 for ringing(220). The destination extension unit counts ringing time, and if the count time exceeds predetermined time, the destination extension unit transmits no answer signal to the originating extension unit(221). The originating extension requests re-occupancy of the destination extension(223). The Internet phone 1 transmits a call release request to the gate keeper(225). The gate keeper requests a call release from the Internet phone 2. The Internet phone transmits an ARQ signal to the gate keeper(229).

Description

Call transfer apparatus and method in private exchange system providing Internet phone service {METHOD AND APPARATUS FOR FORWARDING CALL IN IP-PCX}

The present invention relates to a private branch exchanger (PBX- hereinafter referred to as a "exchange") having an Internet access point system capable of accessing the Internet. Particularly, a call forwarded between IP-PHONEs using an existing terminal is forwarded. It relates to a device and a method that can be.

Today, due to the rapid spread of the Internet and the demand for various services, the Internet Protocol (“IP”) network is dramatically developed in terms of performance and service. As a result, demand for more diverse services continues to emerge in the market.

One of the requirements, the delivery of voice over the IP network has become a big part of the IP network along with the transmission of data, and the demand for various voice transmission functions is also required. Therefore, integration between legacy telecommunication and voice IP (VOIP) by digital phones and single line phones is required.

Therefore, there is a need for a terminal capable of responding to various requirements by making the terminal to operate in the same shape as the existing digital telephone. Due to this need, an Internet phone (IP-PHONE) has been developed.

Typically the Internet phone communicates with the exchange using the ITU-T Recommendation H.323 protocol. The H.323 protocol is a protocol for multimedia communication such as voice, video and data. However, the H.323 protocol is defined as performing only basic calls and is not defined in additional functions such as call forward and transfer like existing terminals such as digital phones and single line phones. .

As described above, the conventional Internet phone provides only basic basic call functions and has no problem of providing additional functions.

Accordingly, an object of the present invention is to provide an apparatus and method for performing call transfer between Internet phones in a private exchange including an Internet access point (IAP).

The present invention to achieve the above object; A private exchange connected to an internet network, comprising: a gateway connected to the internet network to interface signals transmitted and received to and from the internet, and interfacing internal signals of the private exchange, and the gateway through a local area network (LAN) line; A plurality of Internet phones connected to the Internet network through the gateway and connected to the Internet network, and connected to the Internet phones through a local area network to authenticate the Internet phones and to control the Internet phones. A gatekeeper which forms a communication path with the gateway, and when a call is generated from any one of the Internet phones, is controlled by the gatekeeper and is connected through the local area network line and a gateway to occupy an outgoing extension to the corresponding Internet phone. For incoming station occupancy The call extension information of the calling extension and the call forwarding information of the Internet phones, and if the call transfer is set by checking the call transfer information of the Internet phone corresponding to the request of the call extension of the calling extension, Characterized by consisting of the incoming extension to switch to.

According to another aspect of the present invention, there is provided a plurality of Internet phones, a gatekeeper connected to the Internet phones and a local area network to control the Internet phones, an outgoing station to control an outgoing extension, and an incoming call. In a call switching method of a private switching system comprising a call extension that controls an extension and has information on whether a call transfer is set up for the Internet phones and a call transfer target Internet phone, wherein any first Internet phone of the Internet phones includes: Attempting to make a call to a second Internet phone, which is any one of the Internet phones, the first Internet phone requesting an extension of the extension to the calling extension through the gatekeeper; The incoming call corresponding to the second internet phone by occupying the outgoing extension The call request information of the call forwarding information and the call forwarding information for the call forwarding target Internet phone, if the call forwarding is set to the call forwarding information of the second Internet phone for the occupied extension occupancy; And transmitting to the extension unit, and the calling extension receives the call transfer information and requests the occupied extension corresponding to the call transfer target Internet phone to the called station to perform the call transfer. .

1 is a diagram showing the configuration of a private exchange system for providing an Internet phone service to which the present invention is applied.

2 is a flowchart illustrating a call transfer method in a private exchange system for providing an Internet phone service according to a first embodiment of the present invention.

Figure 3 is a procedure showing a call transfer method in a private exchange system providing an Internet phone service according to a second embodiment of the present invention.

Figure 4 is a procedure showing a call transfer method in a private exchange system providing an Internet phone service according to a third embodiment of the present invention.

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

First, in adding the reference numerals to the components of each drawing, the same components have the same reference numerals as much as possible even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention is to perform the call transfer add-on function between the Internet phones.

1 is a diagram showing the configuration of a private exchange system to which the present invention is applied. A description with reference to FIG. 1 is as follows.

Reference numeral 101 in FIG. 1 denotes a legacy phone such as a digital phone and a single-line phone. Reference numeral 110 is a private switch, and includes a gateway 115 for an Internet access point, an outgoing extension 111 for controlling an outgoing extension, and a called extension 113 for controlling an incoming extension. Reference numeral 120 is connected to a plurality of Internet Phones 121, 123, 125 via a local area network line, includes information related to the Internet Phones, and controls the plurality of Internet Phones. The Internet phones are IP terminals that can be applied to an Internet Access Point (IAP) system. The Internet phones are connected to the gateway 115 of the private exchange 110 via a local area network line, and are connected to the calling extension 113 and the receiving extension 111 through the gateway 115. The called extension 113 sets an unanswered call transfer, a call transfer, and an unconditional call transfer for a specific Internet phone according to an embodiment of the present invention, and must have a corresponding Internet phone address to be transferred.

Briefly describing the operation of the configuration, the gateway 115 interfaces with a signal connected to the Internet network to and from the Internet, and interfaces signals inside the private exchange. The Internet phones are terminals that are connected to the gateway through a local area network (LAN) line and are connected to the internet network through the gateway to perform a telephone call. As described above, the gate key 120 is connected to the Internet phones through a local area network to perform authentication of the Internet phones and to control the Internet phones to form a communication path with the gateway 115. The call extension 111 is connected to the local area network line and the gateway under the control of the gatekeeper when a call is generated from any one of the Internet phones, occupies the call extension, and occupies the call extension for the corresponding Internet phone. Require. Then, the incoming extension unit 113 has call transfer information for the Internet phones, and if the call transfer is set by checking the call transfer information of the Internet phone corresponding to the request of the incoming extension of the calling extension, Perform a call transfer to your phone. Hereinafter, a call switching method according to the above configurations will be described in detail with reference to FIGS. 2 to 4, and the gateway 115 for interfacing the signals with the internal signals and the Internet network will not be described in the following description.

2 is a diagram illustrating a procedure for switching when there is no response according to the first embodiment of the present invention. A description with reference to FIG. 2 is as follows. An example in which the Internet phone 1 121 attempts to make a call to the Internet phone 122 will be described.

When attempting to call from the Internet phone, the Internet phone can be processed only after the authentication procedure with the gatekeeper 120 is approved. That is, the Internet phone 1 121 transmits the ARQ signal to the gatekeeper 120 in step 201. The gatekeeper 120 receiving the ARQ signal performs an ARQ request to the originating extension 111 in step 203. The originating extension unit 111 receiving the ARQ request requires the station to occupy the extension 1 in step 204 and the extension station 113 to the destination extension unit 113 in step 205. In response to receiving the incoming extension 1 occupancy request, the incoming extension unit 113 requests occupancy of the incoming extension 1 to the gatekeeper 120 in step 207. The gatekeeper 120 then authenticates the Internet phone 1 121 and transmits an ACF (Admission Confirmation) signal to the Internet phone 121. The Internet phone 121 receiving the ACF sets up a call setup message through the outgoing station with the gatekeeper 120 in step 211, and the gatekeeper 120 calls the Internet phone 123 in step 213. Perform setup. The receiving extension unit 113 transmits a response signal to the calling extension unit 111 informing that it occupies the receiving extension 1 in step 215. The incoming extension unit 113 transmits a ring signal to the gatekeeper 120 in step 217. Upon receiving the ring signal, the gatekeeper 120 transmits the ring signal to the Internet phone 1 121 in step 219 to allow the user of the Internet phone 121 to listen to the ringback tone, and transmits the ring signal to the Internet in step 220. Ring to ring the phone 2 (123). The receiving extension unit 113 counts the time at which the ring signal is transmitted, that is, the ring ringing time after transmitting the ring signal, and transmits the called party's non-answering signal in step 221 when the counted time exceeds a predetermined time. Transmission to the extension 111. The calling extension 111 receives the unanswered signal from the called extension 113 and requests to reoccupy the called extension in step 223. Upon receiving the re-occupancy request, the Internet phone 1121 transmits a call release request to the gatekeeper 120 in step 225. The gatekeeper 120 requests the call release to the Internet phone 2 123 when the release request is input. In step 223, the internet phone 121 receiving the re-occupancy request transmits an ARQ signal to the gatekeeper 120 in step 229. The gatekeeper 120 requests the ARQ to the calling extension 111 in the same manner as in step 203. Then, the calling extension 111 receives the ARQ request and occupies the extension, and requests the incoming extension 2 to occupy the extension 2 at step 223. The receiving extension unit 113 receives the request for occupying the extension 2, and makes a request for occupancy to the gatekeeper 120 in step 235. The gatekeeper 120 receives the occupancy request and transmits an ACF signal to the Internet phone 1 121. The Internet phone 1 121 requests the call keeper 120 to set up a call after receiving the ACF, and the gate keeper 120 receiving the call setup request calls the Internet phone 3 125 through the extension 2 in step 239. Requires setup. After the call setup is made, the incoming station 113 transmits a response to the occupied extension 2 to the outgoing extension 111 in step 231 and generates a ring signal in step 233 to transmit it to the gatekeeper 120. The gatekeeper 120 transmits the ring signal to the Internet phone 1 121 in step 235 and to the Internet phone 3 125 in step 236. In this case, when the Internet phone 3 125 hooks off, the internet phone 3 125 transmits a connection signal to the gatekeeper 120 in step 237. Then, the gatekeeper 120 transmits a connection signal to the Internet phone 1 121 in step 238. After the connection signal is transmitted in step 238, the incoming extension response signal is transmitted to the incoming extension unit 113 in step 239. Then, the incoming extension unit 113 transmits the incoming extension response signal to the outgoing extension unit 111 in step 241 to form a call path.

The incoming extension occupancy response conveys the status of the receiving extension, and whether the incoming extension is in use, how it is in use, how forward is registered, and so on. The non-answer indicates that the incoming extension has not responded for a predetermined time and that the NoAnswer Forward function is registered.

3 is a diagram illustrating a procedure between components according to a call transfer during a call according to an exemplary embodiment of the present invention. Hereinafter, a call transfer method during a call will be described with reference to FIG. 3. In the following description, the case where the Internet phone 1 121 requests a call to the Internet phone 2 123 and when the Internet phone 2 123 is busy, switches to the Internet phone 3 125 during the call. Let's explain.

First, the Internet phone 1 121 transmits an ARQ signal requesting a call to the Internet phone 2 123 in step 301. The ARQ signal is input to the gatekeeper 120, and the gatekeeper 120 receiving the ARQ signal transmits an ARQ request signal to the calling extension 111 in step 303. The originating station 111 that receives the ARQ request signal occupies the station, and transmits a signal for requesting the occupancy of the destination station 1 to the destination station 113 in step 305. The receiving extension 113 receives the incoming extension 1 occupancy request and checks whether the incoming extension 1 is busy. The incoming extension 1 occupancy response signal indicating whether the incoming extension 1 is busy is transmitted to the calling extension 111 in step 307. If the incoming extension 1 is busy, the incoming extension 1 occupied response signal includes information for switching during the call to the incoming extension 2. The incoming extension unit 113 should be set to switch to incoming extension 2 when the incoming extension 1 is busy. If the incoming extension 1 occupancy response signal includes information on the incoming extension 2 for call transfer during a call, the calling extension 111 requests the occupancy of the incoming extension 2 in step 309. The receiving extension unit 113 receives the occupancy extension 2 request and checks whether the receiving extension 2 is in the same call, and checks whether the call transfer is set to another incoming extension when in the call. However, the following description describes the case where the call is not busy. If the incoming extension 2 is not in a call, the incoming extension 113 transmits the occupancy request signal to the gatekeeper 120 in step 311, and the gatekeeper 120 receiving the occupancy request in step 313 selects the Internet phone 1. An authentication signal for authenticating 121 is transmitted to the Internet phone 1 121. The authenticated Internet phone 1 121 performs call setup with the Internet phone 3 125 through the gatekeeper 120 in steps 314 and 315. When the call is established, the receiving extension unit 113 transmits the incoming extension 2 occupancy response signal to the calling extension unit 111 in step 316, and generates a ring signal in step 317 to transmit it to the gatekeeper 120. Upon receiving the ring signal, the gatekeeper 120 transmits the ring signal to the Internet phone 1 121 in step 318, and transmits the ring signal to the Internet phone 3 125 in step 319. Upon receiving the ring signal, the Internet phone 3 125 rings a ring. When the user hooks off in response to the ring ringing, the Internet phone 3 125 transmits a connection signal to the gatekeeper 120 in step 320. . After receiving the connection signal, the gatekeeper 120 transmits the connection signal to the Internet phone 1 121 in step 321 and transmits the incoming extension response signal to the destination extension unit 113 in step 323. The incoming extension unit 113 receiving the incoming extension response signal transmits the incoming extension response signal to the outgoing extension unit 111 in step 325 so that the Internet phone 1 121 and the Internet phone 3 125 receive the incoming extension 2. Through the call is connected. If the user of the Internet phone 3 125 hooks up and requests a call release during the call, the Internet phone 3 125 transmits a call release signal to the gate keeper in step 327 and the gatekeeper 120. ) Transmits the call release signal to the Internet phone 1 121 in step 329 and ends the call by transmitting a call disconnection signal to the destination extension 113 and the destination extension 111 in steps 331 and 333, respectively. . When the Internet phone 1 121 first hooks on, the Internet phone 1 121 cuts a call by transmitting a call release signal.

4 is a flowchart illustrating an unconditional call transfer method according to a third embodiment of the present invention. In the case of FIG. 4, when the Internet phone 2 123 sets the call transfer to the Internet phone 3 125, the call is automatically transmitted when the Internet phone 1 121 sends the call to the Internet phone 2 123. FIG. Internet phone 3 (125) is switched to the call between the Internet phone 121 and the Internet phone 3 (125).

4 is similar to the process of FIG. 3, but only when the incoming station 1 occupancy is requested in step 405 corresponding to step 305 of FIG. 3, the called extension unit 113 responds to the request. It is determined whether call forwarding is set without checking whether the call is busy or not, and if so, the call extension is set to the incoming station. Only the process of transmitting the signal to the calling extension 111 is different. That is, unconditional call transfer and call transfer only differ in the process of determining whether the called extension 113 checks whether or not the called extension is established or whether unconditional call transfer is set.

As described above, only the definition between the H323 protocol and the Internet phone applied to the existing private exchange can be performed without the addition of a separate protocol. There is an advantage that the equipment cost of the exchanger is low.

Claims (4)

In a private exchange connected to the Internet, A gateway connected to the internet network to interface signals transmitted / received to / from the internet and to interface signals inside the private exchange; A plurality of internet phones connected to the gateway through a local area network (LAN) line and connected to the internet network through the gateway to perform a telephone call; A gatekeeper connected to the Internet phones through a local area network to perform authentication of the Internet phones and to control the Internet phones to form a call path with the gateway; An outgoing extension unit connected to the local area network line and a gateway under the control of the gatekeeper when a call is generated from any one of the Internet phones, occupying an outgoing extension, and requesting an outgoing extension to the corresponding Internet phone; The call extension information for the Internet phones, and if the call transfer is set by checking the call transfer information of the Internet phone corresponding to the request for the occupied extension of the outgoing extension unit, the call extension is transferred to the corresponding Internet phone. Call forwarding device characterized in that. A plurality of Internet phones, a gatekeeper connected to the Internet phones and a local area network to control the Internet phones, an outgoing extension to control an outgoing extension, a call extension to set up a call transfer to the Internet phones In a call switching method of a private switching system having a destination extension having information on whether or not and a call transfer target Internet phone, Requesting extension of the first Internet phone through the gatekeeper to the calling extension when any first Internet phone of the Internet phones attempts to make a call to a second Internet phone which is any Internet phone of the Internet phones; , Requesting, by the calling extension, to occupy an outgoing extension according to the outgoing extension occupancy request and requesting the incoming extension to occupy an incoming extension corresponding to the second internet phone; Transmitting, by the incoming extension unit, call transfer information of the second Internet phone for the occupied extension to transmit the call transfer information for the call transfer target Internet phone to the calling extension unit if call transfer is set; And the calling extension receives the call transfer information and requests for the occupied extension corresponding to the call transfer target Internet phone to the called extension to perform the call transfer. The method of claim 2, wherein the call transfer information is transmitted when the second Internet phone does not have a predetermined time response. The method of claim 2, wherein the call transfer information is transmitted when the second Internet phone is busy.