JP2005204262A - Ip telephone user addition service apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To respond to the arrival of a telephone call without using the Internet network for the telephone conversation, when a user of IP telephone receives the call from a network other than the Internet network. <P>SOLUTION: An IP telephone user addition service apparatus (router apparatus 101A) includes an Internet connecting socket 103A for the Internet network 102, a telephone network connecting socket 107A for a subscribers' telephone network 106, a telephone connecting socket 109A for a telephone set 108A utilizable both for IP telephone and subscribers' telephone, and an information terminal connecting socket 104A for accessing the Internet. When a telephone call arrives from the telephone network 106 during a conversation by the IP telephone, a router function controller 121 receives information on an originator such as a telephone number of the originator, etc., and the telephone network 106 is opened and ring tones are rung. Moreover, acquired information is sent to a telephone set 108A being in the course of a telephone conversation, a notification sound is generated, a telephone conversation by the telephone network 106 is made possible by hooking, and a holding tone is sent out to a telephone partner with whom a telephone conversation has been held. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides an IP telephone user supplementary service capable of notifying IP telephone users who perform telephone services using the Internet network of predetermined information on the subscriber telephone line side received from the subscriber telephone line before the start of the call. The present invention relates to an apparatus and an IP telephone user additional service method.

  The Internet protocol (IP) is a network protocol for sending data from a communication device such as a transmission source computer to a target communication device via a router as a repeater. With the spread of the Internet, the use of IP telephones that communicate voice using the Internet protocol is rapidly expanding. At the same time, a user of a telephone using a telephone line (hereinafter referred to as a subscriber telephone) starts using an IP telephone or makes a telephone call between a subscriber telephone subscriber and an IP telephone user. It is becoming more and more frequent.

  Subscriber telephones provide various services to users. Among these services, there is a number display service as one of services performed before the start of a call. This is a service for transmitting a caller's telephone number to the other party before starting the call. If this service is used, the caller can be identified before the start of the call, so in the case of a nuisance call, the user can hang up without calling the caller.

  In addition, there is a service called call waiting, for example. In this service, if a call is made to the telephone during a call or while accessing the Internet, the telephone can be called with the other party during the call after ringing the bell, or the other party's message is exchanged. It is a service that the side records. There is also a service such as a three-party call service that allows a person to make a conference with a party in addition to those who have called during a call.

  As IP telephones become more widespread and there are more opportunities to make calls between subscriber telephone subscribers and IP telephone users, IP telephone users will be able to use these services provided by subscriber telephones. It is becoming necessary to be able to use it. Various techniques for realizing such a service are also discussed in a document relating to a protocol experimentally compiled on the Internet called RFC (Request For Comments) and in an Internet draft.

  In view of this, an IP telephone system has been proposed that notifies the user of other IP telephones that have been received during an IP telephone call (see, for example, Patent Document 1). In Patent Document 1, a gateway device is connected to this gateway device. The control center is inquired of the information on the other telephones in the IP telephone call on which the connected telephone makes a telephone call and information on the gateway apparatus connected to the telephone. The control center is a device that controls the entire IP telephone system, returns an answer to the inquiry to the gateway device, and notifies the gateway device connected to other telephones that are engaged in the IP telephone call. The gateway device that has received the incoming call notification from the control center is configured to synthesize the incoming voice guidance for notifying the incoming call from other users with the voice data being received and to flow to the telephone connected to the gateway device. . This makes it possible to notify the user of other Internet telephone calls that have been received during an Internet telephone call.

  In addition, when a mobile phone PDA (Personal Digital Assistant) is connected to the Internet and an incoming call is made from another phone, the network access processing is performed after notification of the phone number and the name of the other party. It has been proposed that call voice transmission / reception processing is performed by connecting to an interrupt telephone in parallel (see, for example, Patent Document 2). In Patent Document 2, an incoming call is transferred to the Internet in cooperation with a telephone exchange, thereby enabling a call via the Internet.

Further, it has been proposed that when a terminal device used by the user is connected to the Internet, an incoming call to the telephone is displayed on the screen of the terminal device so that the user can respond to the incoming call as necessary. (For example, refer to Patent Document 3). In the technique described in Patent Document 3, when there is an incoming call notification while the terminal device is connected to the Internet, a predetermined information terminal activation signal is sent from the station side prior to the notification. Is used. Since this information terminal activation signal is a low-frequency signal, it is extracted using a low-pass filter prepared on the terminal device side, passed through a demodulator and analog-digital converter, and sent for browsing the Internet. The incoming signal is analyzed using two types of data analysis converters dedicated to each. Thus, the information terminal activation signal prior to the incoming call notification during a call can be displayed on the screen of the terminal device.
JP 2000-174904 A (paragraphs 0017 to 0019, FIG. 3) JP 2002-009942 A (0011, FIG. 1) JP 2002-247148 A (paragraph 0040, paragraphs 0045 to 0048, FIG. 5)

  However, in the technique disclosed in Patent Document 1 among these, not only a normal router but also a control center for controlling the entire IP telephone system is provided. Therefore, there is a problem that the price of the entire apparatus for providing the additional service to the IP telephone user increases.

  In the technique disclosed in Patent Document 2, the incoming call is transferred to the Internet, and a call can be made via the Internet. Therefore, data transfer using the Internet network and signal transmission for a call are used in combination, and when a large amount of data such as video is transferred, the voice quality of the call deteriorates. There is a problem.

  Furthermore, in the technique disclosed in Patent Document 3, a low-pass filter, a demodulator, and an analog-digital converter prepared on the terminal device side are used to display the incoming call on the display screen of the terminal device. ing. Therefore, the terminal device is required to be a device such as a personal computer capable of preparing such hardware and display software.

  As described above, the conventional IP telephone user supplementary service device requires a special device in addition to the router necessary for the Internet connection, or transmits an audio signal sent from other than the Internet network while connected to the Internet network to the Internet. There is a problem that the transmission quality of the real-time audio signal may not be stable because the call is sent to the network.

  Therefore, an object of the present invention is that there is no need for an IP telephone user to purchase or prepare a special device, and when a call is made from other than the Internet network, the Internet network is not used for the call. An object of the present invention is to provide an IP telephone user additional service apparatus and an IP telephone user additional service method that make it possible to respond to the incoming call.

  According to the first aspect of the present invention, (a) an Internet connection port connected to a network network using the Internet protocol, (b) a telephone network connection port connected to a subscriber telephone network, and (c) a telephone connection connecting a telephone. And (d) an information terminal connection port for connecting an information terminal for accessing the Internet, and (e) a telephone is connected to a telephone of a predetermined destination via a network network using the Internet connection port. When a telephone call is made using a telephone, an incoming call detection means for detecting an incoming call from a subscriber telephone network switch via a telephone network connection port, and (f) the incoming call detection means Pre-arrival information storage means for acquiring and storing predetermined pre-incoming information that is notified to the called party as pre-incoming information when a call is detected, and (g) pre-incoming information Pre-arrival information notifying means for notifying the pre-incoming information stored in the payment means to the telephone connected to the telephone connection port; and (h) for the telephone connected to the telephone connection port at the time of notification by the pre-incoming information notification means. An incoming call notification means for notifying that there is a new incoming call using the subscriber telephone network, and (i) a hold when a signal responding to the incoming call by the notification of the incoming call notification means is sent from the telephone connected to the telephone connection port On-hold sound sending means for sending sound to the telephone connected to the telephone connection port to the other party's telephone at the time of the call, and (nu) a signal responding to the incoming call by the notification of the incoming call notification means Call switching means for switching a call with the other party's telephone during a call via a network network to a call with a subscriber telephone via a telephone network connection port when the call is sent from a telephone connected to the telephone A is provided in the IP phone users additional services unit.

  That is, according to the first aspect of the present invention, when a telephone is connected to a predetermined destination telephone through a network using the Internet connection port and a telephone call is made using the network, When an incoming call is received by a subscriber telephone from the exchange via the telephone network connection port, the incoming call detection means detects this, acquires predetermined pre-incoming information, notifies the telephone of this, and has a new incoming call. Is notified to the telephone by the incoming call notification means. When the telephone responds to the incoming call, the hold tone is sent to the telephone of the other party with whom the telephone call has been made and the telephone call destination is switched. In this way, it is possible to switch calls and acquire pre-incoming information at the previous stage with a single device.

  In the invention according to claim 5, (a) a telephone connected to the telephone connection port of the own device is connected to a predetermined destination telephone and the network network using an Internet connection port connected to a network network using the Internet protocol. When a call is made using a network network, a call is detected when an incoming call is received by a subscriber telephone through a telephone network connection port connected to the subscriber telephone network from a subscriber telephone network switch. An incoming call detection step; (b) a pre-incoming information storage step for acquiring and storing predetermined pre-incoming information that is notified to the called party as pre-incoming information when an incoming call is detected in the incoming call detection step; C) a pre-incoming information notifying step for notifying the pre-incoming information stored in the pre-incoming information storing step to a telephone connected to the telephone connection port; An incoming call notification step for notifying the telephone connected to the telephone connection port that there is a new incoming call using the subscriber telephone network at the time of the notification in the information notification step; and (e) responding to the incoming call by the notification in the incoming call notification step. A hold sound sending step of sending a hold sound to a telephone connected to the telephone connection port to the telephone of the other party at that time when a signal is sent from the telephone connected to the telephone connection port; To) When a signal responding to an incoming call by the notification in the incoming call notification step is sent from a telephone connected to the telephone connection port, a call with the telephone of the other party on the call via the network is made via the telephone network connection port. The IP telephone user additional service method includes a call switching step for switching to a telephone call with a subscriber telephone.

  That is, in the fifth aspect of the present invention, when there is an incoming call through the subscriber telephone network during an IP telephone call in the same processing procedure as in the first aspect of the invention, the switching of the call by one device and the previous stage It is possible to obtain pre-incoming information.

  As described above, according to the present invention, the IP telephone user supplementary service apparatus substitutes the pre-incoming information such as the telephone number of the caller notified when an incoming call is received from the subscriber telephone network or the subscriber line during the IP telephone call. Or in response to the procedure of the IP phone user additional service, and this is notified before the start of the telephone call of the telephone that is going to make a call. Can be confirmed. Moreover, since the IP telephone user-added service device itself is configured as a router having an Internet connection port for connecting to a network network using the Internet protocol and a routing function, a personal computer or the like is purchased by purchasing this device. By simply connecting an information terminal or telephone to this terminal, it is possible to receive pre-incoming information at the time of an incoming call and acquire the information of the other party even during an IP telephone call without purchasing an additional device. it can. In addition, it is possible to perform call waiting in combination with an IP phone and a subscriber phone without going through a switch of the subscriber phone network, regardless of the function of the other terminal. This is because a hold sound is sent to a person who is making a call using an IP phone when the call is switched to a destination.

  Hereinafter, the present invention will be described in detail with reference to examples.

  FIG. 1 shows an outline of a communication system in which a router device as an IP telephone user supplementary service device of this embodiment is used. The router devices 101A and 101B of this embodiment are connected to the Internet network 102 and the Internet connection ports 103A and 103B, respectively, in the same way as a normal router device. Then, by performing routing using a built-in routing table (not shown), the personal computer 105A connected to the router device 101A of the user A via the information terminal connection port 104A, and the router device 101B of the user B Routing to the personal computer 105B connected via the information terminal connection port 104B.

  The router apparatuses 101A and 101B of the present embodiment further have telephone network connection ports 107A and 107B for connecting to the subscriber telephone network 106 to perform subscriber telephone communications, and telephones 108A and 108B owned by the respective users A and B. Phone connection ports 109A and 109B. Even if the personal computers 105A and 105B of the respective users A and B are not activated and the users A and B are using IP telephones, the third computers connected to the subscriber telephone network 106 are connected. An incoming call from the subscriber's subscriber telephone 110 can be detected and responded to. That is, the personal computers 105A and 105B are not necessary when using IP telephones, and even if a user who has not purchased them is provided with the router devices 101A and 101B of the present embodiment, the subscriber telephone network Similarly to the subscriber telephone 110 using the network 106, it is possible to receive a predetermined service before an incoming call. Of course, by connecting to the Internet network 102 using the personal computers 105A and 105B, communication such as browsing various contents and transferring files is possible. The personal computers 105A and 105B are also used for various settings for the connection destination router apparatuses 101A and 101B.

  FIG. 2 shows a configuration of a router device used by the user A. Since the router apparatus 101B used by the user B has the same configuration as the router apparatus 101A, its illustration and description are omitted. The router device 101A is connected to the Internet connection port 103A and receives a modem function control device 121 for realizing a routing function and a PSTN (Public Switched Telephone Network) terminal modem (modem) signal connected to the telephone network connection port 107A. PSTN terminal modem signal receiver 122 is provided. The router function control apparatus 121 is connected to the personal computer 105A shown in FIG. 1 via the information terminal connection port 104A. The Internet connection port 103A is a connection port for performing Internet communication and IP telephone communication, and is connected to, for example, ADSL (Asymmetric Digital Subscriber Line) or CATV (CAble TeleVision). In addition, when there is a pre-arrival information notification service such as a number display service, the PSTN terminal modem signal receiver 122 can terminate the line once and receive it instead of the telephone 108A (FIG. 1). It has become a structure.

  The router apparatus 101A further includes a relay not shown in the figure, and a relay control apparatus 123 that controls switching of the contacts thereof, a tone control apparatus 124 that similarly controls the tone signal of the telephone 108A, and FIG. A voice conversion control device 125 is provided that converts voice as a data signal sent by an IP telephone using the Internet network 102 shown above into voice of an analog signal and vice versa. The internal configuration of the router device 101A is realized by a storage medium such as an existing hardware circuit component, a CPU (Central Processing Unit) (not shown), and a ROM (Read Only Memory) storing a control program. Yes.

  In the present embodiment, the router function control device 121 performs not only the routing function but also the overall control inside the router device 101A. As an example, processing of transmission / reception data 131 transmitted / received via the personal computer 105A and the information terminal connection port 104A is performed, and processing of transmission / reception data 132 via the Internet connection port 103A is performed. Also, a voice data signal 133 as a digital signal sent to the voice conversion control device 125 by an IP telephone is supplied to the voice conversion control device 125 to convert it into an analog signal voice and vice versa. . When the hold sound 135 output from the tone control device 124 is converted into a digital signal by the voice conversion control device 125, the converted hold sound 136 is input and processed, and transmitted / received data 132 from the Internet connection port 103A. Process to send out.

  FIG. 3 shows an outline of a circuit of the relay control device. The relay control device 123 closes the contact point when the excitation coil 141, the excitation circuit 142 connected in series to the excitation coil 141, the power source 143 connected to both ends of these series circuits, and the excitation coil 141 are not excited. And a normally open contact 145 that closes the contact while the exciting coil 141 is energized. One end sides of the normally closed contact 144 and the normally open contact 145 are both connected to the telephone connection port 109A. The other end of the normally closed contact 144 is connected to the voice conversion control device 125. The other end of the normally open contact 145 is connected to the telephone network connection port 107A. The excitation circuit 142 excites the excitation coil 141 when the PSTN termination modem signal receiver 122 shown in FIG. 1 supplies the relay excitation signal 151.

  It is assumed that the user A side where the router apparatus 101A having such a configuration is arranged uses the telephone 108A shown in FIG. 1 to perform IP telephone communication with the user B using the telephone 108B and the Internet network 102. In this state, it is assumed that a third party subscriber telephone 110 (FIG. 1) connected to the subscriber telephone network 106 calls the user A telephone 108A.

  Before the subscriber telephone 110 makes a call, the exciting coil 141 of the relay control device 123 shown in FIG. 3 is not excited, and the voice conversion control device 125 is connected to the telephone connection port 109A via the normally closed contact 144. It is connected to the. In this state, the voice spoken by the user A with the telephone 108A is supplied from the telephone connection port 109A to the voice conversion control device 125, where the voice signal 153 as an analog signal is converted into a digital signal and is converted into a voice data signal 133. It is passed to the router function control device 121. The router function control device 121 packetizes the voice data signal 133 and transmits it to the Internet network 102 from the Internet connection port 103A. This packetized voice signal is sent to the router device 101B of the user B as a call destination of the IP phone.

  On the other hand, the voice spoken on the telephone set 108B of the user B reaches the router apparatus 101A of the user A via the Internet network 102 as a packetized voice signal. The packetized voice signal is input to the router function control apparatus 121 from the Internet connection port 103A, and the voice signal portion is extracted from the packet and supplied to the voice conversion control apparatus 125. The voice conversion control device 125 converts this into a voice signal 154 as an analog signal and sends it to the relay control device 123. The relay control device 123 supplies the audio signal 154 to the telephone connection port 109A via the normally closed contact 144 that is closed in this state. In this way, user A and user B can perform voice communication by IP telephone.

  In such a state, it is assumed that a third party calls the user A's telephone 108A from the subscriber telephone 110 shown in FIG. As a result, a subscriber telephone incoming signal 156 (FIG. 2) arrives from the subscriber telephone network 106 to the telephone network connection port 107A. This incoming telephone call signal 156 is input to the router function controller 121 via the PSTN terminal modem signal receiver 122. The router function control device 121 performs this signal processing as described below together with the PSTN termination modem signal receiving device 122 and the like under program control by the CPU and ROM described above.

  FIG. 4 shows the flow of processing of the router device when a subscriber telephone incoming signal is input. When the router function controller 121 detects the arrival of the incoming telephone call signal via the PSTN terminal modem signal receiver 122 (Y in step S201), the router function controller 121 makes a call from an unillustrated exchange of the telephone network 106 according to the pre-incoming information notification procedure. Information such as the telephone number of the person is received (step S202). The received information is stored in a memory (not shown) in the PSTN terminal modem signal receiver 122 (step S203). When the entire router apparatus 101A shares one memory area as a working memory, a part of this may be used as the corresponding memory.

  When the reception of the information such as the telephone number of the caller is completed, the PSTN terminal modem signal receiver 122 opens the subscriber telephone network 106 and sets the ringing signal (IR) to ring (step S204).

  The router function controller 121 notifies the telephone 108A of the telephone number information of the subscriber telephone 110 stored in the memory according to the call reception information notification procedure from the PSTN terminal modem signal receiver 122 (step S205). The notification content is displayed on a display such as a liquid crystal attached to the telephone 108A, for example. When the transmission of the telephone number information is completed (step S206: Y), the router function control apparatus 121 requests the tone control apparatus 124 to transmit an incoming tone tone for notifying the user A of a new incoming call. When the tone control device 124 receives this request, it sends an incoming tone to the telephone 108A (step S207), and causes the telephone 108A to sound an incoming tone (step S208).

  By listening to this incoming tone from the telephone set 108A, the user A can recognize that a new incoming telephone call has occurred. When the user A responds to the incoming call from the subscriber telephone, a predetermined signal is transmitted from the telephone 108A to the router device 101A. In this embodiment, this signal is generated by hooking the telephone 108A. When the hooking is detected on the router function control device 121 side (step S209: Y), the router function control device 121 instructs the tone control device 124 to generate the hold sound 135 (step S210). The hold tone 135 is for sending to the user B who is currently talking. The generated hold sound 135 is sent to the voice conversion control device 125 and converted into a digital signal. The router function control device 121 packetizes the converted hold tone 136 and sends it out from the Internet connection port 103A as transmission / reception data 132 (step S211).

  As a result, the user B who is the other party of the IP telephone can recognize that the user A is compatible with a new incoming telephone call. While the user A is responding to a new incoming call, even if there is a voice signal sent from the user B to the router device 101A, the router function control device 121 discards it (step S212). ). After the router function control device 121 processes the hold tone 135 and starts sending it, the PSTN termination modem signal receiving device 122 supplies the relay excitation signal 151 to the excitation circuit 142, and the normally closed contact 144 and the normally open contact of the relay. 145 is switched (step S213). The relay excitation signal 151 may be directly supplied to the excitation circuit 142 by the router function controller 121 instead of the PSTN termination modem signal receiver 122. By switching the normally closed contact 144 and the normally open contact 145 of the relay in this way, the third party subscriber telephone 110 connected to the subscriber telephone network 106 and the telephone A of the user A are connected to the subscriber telephone network 106. And a call using the subscriber telephone network 106 can be made between them.

  Subsequent resumption of the call between the user A and the user B does not need to be described in particular, so that description thereof is omitted. In the embodiment, the alternative switching between the IP telephone using the Internet network 102 and the subscriber telephone communication using the subscriber telephone network 106 using the relay control device 123 has been described. Of course, the present invention can be applied to any service that informs a person who is talking on the IP phone the predetermined information on the side of the subscriber telephone line received before.

  In the embodiment, the call switching is performed using an actual relay circuit, but it is natural that the same switching control may be performed using a signal control technique using an electronic circuit or software. Furthermore, although the personal computers 105A and 105B are connected to the router apparatuses 101A and 101B in the embodiment, it goes without saying that other information terminals that can be connected to the Internet may be connected.

It is a schematic block diagram of the communication system in which the router apparatus as an IP telephone user additional service apparatus of a present Example is used. It is a block diagram showing the structure of the router apparatus which the user A uses in a present Example. It is a block diagram showing the outline | summary of the circuit of the relay control apparatus of a present Example. It is a flowchart which shows the process of a router apparatus when a subscriber telephone incoming call signal is input in a present Example.

Explanation of symbols

101 Router device (IP phone user additional service device)
DESCRIPTION OF SYMBOLS 102 Internet network 103 Internet connection port 104 Information terminal connection port 105 Personal computer 106 Subscribed telephone network 107 Telephone network connection port 108 Telephone 109 Telephone connection port 110 Subscriber telephone 121 Router function control device 122 PSTN termination modem signal reception device 123 Relay control device 124 tone control device 125 voice conversion control device 141 exciting coil 142 exciting circuit 144 normally closed contact 145 normally open contact

Claims (5)

An Internet connection for connecting to a network using the Internet protocol;
A telephone network connection port to connect to the subscriber telephone network;
A telephone connection port for connecting a telephone;
An information terminal connection port for connecting an information terminal accessing the Internet;
When the telephone is connected to a telephone of a predetermined destination via the network network using the Internet connection port and a telephone call is performed using the network network, the telephone set is switched from the switch of the subscriber telephone network. An incoming call detecting means for detecting when an incoming call is received by a subscriber telephone through a network connection port;
Pre-incoming information storage means for acquiring and storing predetermined pre-incoming information notified to the called party as pre-incoming information when the incoming call detecting means detects an incoming call;
Pre-incoming information notification means for notifying the pre-incoming information stored in the pre-incoming information storage means to a telephone connected to the telephone connection port;
An incoming call notification means for notifying that there is a new incoming call using the subscriber telephone network to the telephone connected to the telephone connection port at the time of notification by the pre-incoming information notification means;
When a signal responding to the incoming call by the notification of the incoming call notification means is sent from the telephone connected to the telephone connection port, a hold sound is sent to the telephone connected to the telephone connection port at the time of the other party who is currently calling Holding tone sending means for sending to the telephone;
When a signal responding to an incoming call by the notification of the incoming call notification means is sent from a telephone connected to the telephone connection port, a call with the telephone of the other party of the call is connected to the telephone network via the network. An IP telephone user-added service apparatus, comprising: call switching means for switching to a call with a subscriber telephone through a mouth.   2. The IP telephone user-added service apparatus according to claim 1, wherein means for realizing a router function for routing is connected to the Internet connection port.   2. The IP telephone user-added service apparatus according to claim 1, wherein the pre-incoming information is a telephone number of an incoming caller telephone.   2. The incoming call notification means is an incoming tone sending means, and the incoming tone is distinguished from an incoming call of a telephone set via the Internet connection port and an incoming call of a telephone set via the subscriber telephone network. The IP telephone user additional service device as described. Using an Internet connection port connected to a network network using an Internet protocol, a telephone connected to a telephone connection port of the own device is connected to a telephone of a predetermined destination via the network network, and the network network is An incoming call detection step for detecting when an incoming call is received by a subscriber telephone through a telephone network connection port connected to the subscriber telephone network from a subscriber telephone network switch when a telephone call is used;
A pre-incoming information storing step for acquiring and storing predetermined pre-incoming information that is notified to the called party as pre-incoming information when an incoming call is detected in this incoming call detecting step;
A pre-incoming information notification step of notifying the pre-incoming information stored in the pre-incoming information storing step to a telephone connected to the telephone connection port;
An incoming call notification step for notifying that there is a new incoming call using the subscriber telephone network to the telephone connected to the telephone connection port at the time of notification by the pre-incoming information notification step;
When a signal responding to an incoming call by the notification in the incoming call notification step is sent from a telephone connected to the telephone connection port, a hold tone is sent to the telephone connected to the telephone connection port at the time of the other party who is currently talking A holding tone sending step for sending to the telephone;
When a signal responding to an incoming call by the notification in the incoming call notification step is sent from a telephone connected to the telephone connection port, a call with the telephone of the other party in the call is made via the network. And a call switching step for switching to a call with a subscriber telephone via the IP telephone user additional service method.

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