FR2786970A1 - METHOD FOR ESTABLISHING A COMMUNICATION BETWEEN TWO TERMINALS THROUGH THE INTERNET THROUGH A CALL AND COMMUNICATION SERVER, ASSOCIATED TERMINAL AND SERVER - Google Patents

Abstract

The invention concerns a method for setting up a communication between a first terminal and a second terminal (T1, T2) via a computer communication network (1) wherein: the first terminal (T1, T2) connects itself to the computer network, obtains a computer address and sends to a call and communication server (3) of the computer network (1) a request for calling the second terminal (T2) to communicate with it via the computer network (1); the server notifies the first terminal call to the second terminal through a one-way communication, of the server to the second terminal, and the second terminal automatically identifies the call notification; the second terminal connects itself to the computer network and obtains a computer address; and the server (3) transmits to at least one of the two terminals (T1, T2) the computer address of the other terminal (T1, T2).

Description

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  METHOD FOR ESTABLISHING A COMMUNICATION

  BETWEEN TWO TERMINALS THROUGH THE INTERNET THROUGH

  CALL AND COMMUNICATION SERVER,

ASSOCIATED TERMINAL AND SERVER

  A computer network such as the Internet allows interlocutors, equipped with a communication terminal, to communicate with each other in real time. The interlocutors can for example dialogue by voice, transmit faxes or exchange data (sound, image, video,

etc.), through the Internet.

  To connect to the Internet, a terminal must have Internet access provided by an access provider. It can be a telephone access, for example by the PSTN network (Switched Telephone Network), or even a access by a local network, such as a company network, having its own access provider. to the Internet. In any case, the cost of long distance communication is much more advantageous over the Internet than over an ordinary telephone network. In the case of telephone access, the interlocutor only pays the cost of telephone communication with the access provider, which is generally carried out locally, and, in the case of access via a local network, communication over the Internet itself is free. In short,

  the cost advantages of the internet are extremely large.

  However, communication terminals do not generally connect permanently to the Internet, but only when necessary, for example to communicate with a correspondent, consult an electronic mailbox or visit a website. Offline, the terminals cannot therefore be notified of a possible "incoming call" on

the Internet.

  In short, the connection of two terminals through the Internet, and more generally through any other computer network of this type, presents difficulties. That is why the plaintiff sought a

  solution to resolve these difficulties.

  To this end, the invention relates to a method for establishing communication between two terminals through a computer communication network, in which, the two terminals being connected to a telephone communication network,

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  - the first of the two terminals connects to the computer network in order to send a call request to a call server and to establish communication between the computer network in order to notify the second terminal of a call to communicate through the computer network , and - in the event of acceptance of the call, after connection of the second terminal to the computer network, the two terminals each having a computer address on the computer network, the server transmits to each

  terminal the computer address of the other terminal.

  1o Thanks to the invention, a terminal, not permanently connected to the computer network, can nevertheless call another terminal or be notified of the call from another terminal, so that the two terminals

  communicate with each other through the computer network.

  Advantageously, if the call is refused by the second terminal, the

  server notifies the first terminal that the call has failed.

  Preferably, in the case where the second terminal is a client of the server and out of communication through the computer network, the server calls the second terminal, through the telephone network, so that the second terminal identifies the caller, using identification data provided by a caller identification service, and interprets the server call as a call notification for communicating across the computer network. Advantageously, in the case where the second terminal is a client of the server and in the course of communication through the computer network, the server transmits to the second terminal a call notification for communicating through the computer network, using the connection in progress of the

  second terminal to the computer network.

  The invention also relates to a communication terminal for implementing the above method, arranged to communicate through the telephone communication network and through the computer communication network, characterized in that it comprises means for prepare a call request and send it to the call and implementation server

  communication and means for detecting a call notification.

  The invention also relates to a call and communication server for implementing the above method, comprising means for i IIIM1 I I ll l V IIl

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  connection to the computer network, means for connection to the telephone network, means for receiving a call request from a communication terminal and notifying the call to said terminal, and means for putting at least two terminals into communication through the computer network.

  The invention will be better understood using the following description of a

  particular embodiment of the method for establishing communication between two terminals through a computer network as well as terminal 0o and a call and communication server, for implementing the method, with reference to the attached drawing in which - FIG. 1 represents a diagram of several terminals, of the server, of the computer network and of a telephone network, - FIG. 2 represents a functional block diagram of the terminal and

  - Figure 3 shows a functional block diagram of the server.

  The method of the invention makes it possible to establish communication between two communication terminals Tl and T2, through a computer network with

  packet switching, in this case the Internet 1.

  Each terminal TI, T2 here consists of a telephone apparatus connected to a telephone communication network, here the switched telephone network PSTN 2, and arranged to carry out voice communications. The terminals T1, T2 each have a telephone call number on the telephone network 2 and also benefit from a caller identification service, provided by the operator of the telephone network 2, allowing them, in the event of incoming call, to receive the telephone number of the caller, without going off-hook, in other words without establishing a telephone connection

with the caller.

  The terminals T1 and T2 each have access to the Internet 1 provided by

  an ISP and FAI2 access provider.

  Internet 1 is a packet switched network. In other words, the data is transmitted over the Internet 1 in packet mode, that is to say in the form of data packets. Each data packet contains a destination computer address on the Internet 1. By "computer address" is intended to denote an address on the Internet network 1, more commonly called "IP address" (Internet Protocol Internet Protocol). These IP addresses consist of a succession of digits and are I I! L - l Ilinl

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  used by the Internet 1 to route data packets to their destination. A communication terminal, connected to the Internet 1, has its own IP address on the Internet network 1, most often assigned by the Internet access provider 1 of the terminal. The IP addresses of communication terminals are generally not fixed, but dynamic, in other words allocated temporarily to the terminals. In other words, the terminal IP address changes quite often, usually each time the terminal is connected to the Internet 1. In this case, the IP addresses

  Tl and T2 terminals are dynamic.

  The two terminals T1 and T2 are clients of a call and communication server 3 of the Internet 1 and, as such, belong to a set of client terminals of the server 3. Each of the client terminals of the together 5 can, in cooperation with the server 3, make and receive calls in order to communicate with a corresponding terminal via the Internet 1. From the outset, it will be noted that by "client terminal of the server 3", we mean a terminal comprising a client call management application for communicating via the Internet 1, compatible with a

  corresponding server application from server 3.

  The two terminals TI, T2 being identical, only one will now be described. The terminal T1 comprises a line interface 10 for transmitting data, comprising a modem for connection to the telephone network 2, a man-machine interface and, in memory, an application for connecting / disconnecting to the Internet 1, the client application for management of calls, sent and received by the TI terminal, to communicate via the Internet 1, and a communication application via the Internet 1, respectively represented by the functional blocks 11, 12 and 13. All of these elements are linked to a central control unit 27, in this case a microprocessor, intended to execute the applications and to control the

operation of terminal T1.

  The human-machine interface comprises a telephone handset comprising a loudspeaker 14 and a microphone 16, respectively connected to a digital / analog converter (DAC) 15 and to an analog / digital converter (ADC) 17, as well as a keyboard 18 and a display screen 19, connected to a block 20 for managing the input and I I11i i11!

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  display. The keyboard 18 has a specific "Internet" key

  for ordering a call over the Internet 1.

  The connection / disconnection block 11 to the Internet 1 is intended to connect the terminal T1 to the Internet 1, by telephone connection to the access provider FAIl, according to a connection process, and to disconnect the

  Internet terminal Tl 1, following a disconnection process.

  The block 13 for communication over the Internet 1 comprises an audio compression / decompression module 0 0 and a format conversion module 22. The module 21 is intended, in transmission, to compress the data of

  voice to be transmitted and, on reception, to decompress the received voice data.

  The module 22 is intended, on transmission, to decompose the data to be transmitted into data packets and, on reception, to recompose the data from received data packets, according to communication protocols of

  Internet 1, in this case the TCP and IP protocols.

  The call management client application for communicating over the Internet 1 allows the TI terminal, in cooperation with the server 3, to make and receive calls to communicate over the Internet

  1, as will be more precisely explained in the description of

  process. Functionally, the block 12 comprises in particular - a module 23 for preparing a call request and addressing it to the server 3, - a module 24 for detecting a call notification from the server 3, - a module 25 for preparing a request call acceptance and send it to the server 3 and - a module 26 to prepare a call refusal request and send it to

server 3.

  The call and connection server 3 will now be described

with reference to Figure 3.

  The server 3 comprises an interface 30 for connection to the Internet 1, in this case a network card, by means of which the server 3 is permanently connected to the Internet 1, an interface 31 for connection to the telephone network 2 comprising a modem, a database 32, and, in memory, a server application for managing calls sent and received by the client terminals of the set 5 and a setting application II i il-Ilt1

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  terminal communication, respectively represented by blocks

36 and 37.

  The database 32 contains, in memory, a table of client terminals 33, a table 34 of terminals awaiting communication via the Internet 1 and a table 35 of terminals in communication with

through the Internet 1.

  The client terminal table 33 includes, for each client terminal of the set 5, a "file" containing identification data of the client terminal, in this case the telephone call number on the telephone network 2 and a number terminal, respectively contained in two specific fields. It should be noted here that each client terminal of

  set 5 is associated with a unique serial number.

  Table 34 lists a plurality of calling terminals and awaiting communication via the Internet 1. It contains, for each of these terminals, a file containing, in specific fields, - the telephone call number of the calling terminal, - the IP address of the calling terminal and - at least one telephone number of a called terminal, with

  which the calling terminal is waiting for communication.

  Table 35 lists all of the client terminals of the server 3 in communication through the Internet 1. It contains, for each of these terminals, a file containing, in specific fields, the number

  phone call and terminal IP address.

  The server application for managing the calls sent and received by the client terminals of the set 5 is intended to allow these terminals to make and receive calls to communicate via the Internet 1. The block 36 comprises in particular - a module 38 for receiving a call request from a terminal and notification of the call to said called terminal, a module 39 for receiving a request for accepting a call and searching for a terminal calling in table 34, - a module 40 for receiving a request for call refusal and notification of call failure to the calling terminal and

  - A module 41 for managing, or updating, tables 33-35.

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  The communication application via the Internet 1 allows the server 3 to connect at least two terminals through the Internet 1, by sending each computer address

  from the other terminal, as will be explained later in the description

  of the process. All the elements of the server 3 are connected to a central control unit, intended to execute the applications and to control the

server operation 3.

  Finally, the server 3 has a telephone number on the network

  2 and a fixed IP address on the Internet 1.

  After the structural description of the client terminals and of the server 3, the

  method of establishing a communication between the two terminals Tl

  and T2 will now be described, in various conceivable cases.

  To call the terminal T2, a user of the terminal Tl presses the "Internet" key on the keyboard 18 and dials the telephone call number

from terminal T2.

  The following steps are carried out by the terminal TI, the terminal T2 and the server 3, by executing their respective applications for managing the

  calls, automatically, i.e. without user intervention.

  The terminal Tl connects to the Internet 1, by telephone connection to

  ISP provider, and obtains an IP address.

  Furthermore, the terminal T1 prepares a call request from the terminal T2 containing, in specific fields, - an indication of the nature of the request, specifying that it is a call request, - the number of the calling terminal T1, - the serial number of the calling terminal T1, - the IP address of the calling terminal T1 as well as

  - the telephone call number of the terminal called T2.

  After connection to the Internet 1, the terminal Tl sends the call request to the

server 3.

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  The server 3 receives the request from the terminal TI, determines that it is a call request, using the indication on the nature of the request, extracts the telephone call number and the serial number of the calling terminal T1 and compares these numbers with those contained in the table of client terminals 33 in order to check whether the terminal T1 is a client of the server 3. The terminal T1 being listed in the table of client terminals 33, the

  server 3 agrees to execute the call request.

  The server 3 then extracts from the call request received the telephone call number 1o of the terminal called T2 and, using this number, searches for a file for the terminal T2 in table 33 of the client terminals in order to

  determine whether the terminal T2 belongs to set 5.

  Since the terminal T2 is listed in table 33, the server 3 then searches for a file for the terminal T2 in table 35 of the terminals in communication, using the telephone call number of the terminal T2, in order to determine whether terminal T2 is in the process of

  communication through the Internet 1.

  1) In the case where the terminal T2 is not in communication through the Internet 1, the server 3 creates and introduces into the table 34 of the terminals awaiting communication through the Internet 1 a file for the terminal T1, containing the telephone call number and IP address of the calling terminal Tl as well as the telephone call number of the terminal

  called T2, in specific fields.

  Then, the server 3 calls the terminal T2 through the telephone network 2

  to notify him of the call from the Ti terminal.

  1.1) In the event that the telephone line of terminal T2 is not busy, upon reception of the call from server 3, terminal T2 receives the telephone call number from server 3, provided by the identification service of the caller, without lifting the telephone line. The call from server 3 is short-lived but sufficient to allow reception of the call number

server telephone 3.

  The terminal T2 compares the telephone call number received with that of the server 3, previously stored in memory. The two numbers being identical, the terminal T2 detects the incoming call from the server 3 and interprets it as a call notification. In other words, the phone call from

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  server 3 at terminal T2 constitutes a call notification which notifies terminal T2 of an incoming call from a corresponding terminal for

  communicate through the Internet 1.

  1.1.1) If the call is accepted, the terminal T2 connects to the Internet 1, by telephone connection to the ISP access provider 2, and obtains a

IP adress.

  Furthermore, the terminal T2 prepares a call acceptance request 0 0 containing, in specific fields, an indication of the nature of the request, specifying that it is a call acceptance request, as well as the telephone number and IP address of the terminal called T2, and

  the address to server 3 through the Internet 1.

  The server 3 receives the request from the terminal T2, determines that it is a call acceptance request, using the indication of the nature of the request, and extracts the number d telephone call from the terminal called T2. The server 3 then searches in the table 34 of the terminals awaiting connection for a file for a terminal awaiting communication with the terminal T2, by comparison of the telephone call number of the terminal T2 with those contained in the number field. terminal telephone call called from each file in the table 34. The server 3 thus finds the file of the terminal T1 and extracts the IP address of the latter. Furthermore, the server 3 extracts the IP address of the terminal called T2 from the

  call acceptance request received.

  The server 3 then transmits to each of the two terminals T1, T2 the address

IP of the other terminal T2, TI.

  After the cross transmission of the IP addresses of the terminals T1, T2, the server 3 updates the tables 34 and 35, by deleting from the table 34 the file for the terminal Tl and by inserting in the table 35 a file for each of the two T1 and T2 terminals, containing the call number

  telephone number and IP address of this terminal.

  Each terminal T1, T2 knowing the IP address of the other terminal T2, Tl, the two terminals T1, T2 can now communicate through o 2786970 the Intermnet 1 and then activate a signal, here audible, to warn their

  communication establishment users.

  During the communication through the Internet 1, the terminals TI, T2 exchange data packets, according to the communication protocols through the Internet 1. In transmission, each terminal T1, T2 captures analog signals from voice to using the microphone, digitizes these signals into voice data which it compresses and then decomposes into data packets then transmitted over the Internet 1. On reception, each terminal T1, T2 recomposes the voice data from the packets of received data then decompresses them before converting them into analog voice signals

  which are broadcast through the speaker.

  When the communication is finished, each terminal TI, T2 sends the server 3 a notification of end of communication so that the server 3 updates the table 35 of the terminals in communication, by deleting from this table 35 the file from terminal T1 and

that of terminal T2.

  1.1.2) If the call from the terminal T1 is refused, the terminal T2 does not react to the call from the server 3 and, after a predefined waiting period without receiving a call acceptance request from the terminal T2, the server 3 sends to the terminal T1 a notification of call failure, via the Intermnet 1. On receipt of this, the terminal T1 activates a signal, here audible, to warn

  the user of the failed call.

  1.2) In the case where the terminal T2 is occupied when receiving the call notification call from the server 3, for example by a telephone call in progress, the server 3 sends a notification of call failure to the terminal Tl which alerts the user to the failure of the call by a signal

audible warning.

  2) In the case where the terminal T2 is listed in table 35 of the terminals in communication over the Internet 1, the server 3 extracts the IP address of the terminal T2 from this table 35 and prepares a call notification that it addresses to terminal T2 through the Internet 1, in the form of data packets, using the current connection of terminal T2 to the Internet 1. The call notification contains an indication of the nature of the notification, specifying that it is a call notification, and

  the IP address of the calling terminal T1, in specific fields.

  li: li111 F il 2786970 During the communication in progress through Internmet 1, terminal T2

  receives and detects the call notification.

  2.1) If the call is accepted, the T2 terminal prepares a call acceptance request, similar to that described above, and the address

  to server 3, through the Internet 1.

  The server 3 receives the call acceptance request, searches table 1o 34 for a file for a calling terminal awaiting communication with the terminal called T2, using the telephone call number of the terminal called T2 extracted of the call acceptance request, and it finds the file for the TI terminal. The server 3 extracts the IP address of the terminal T1 from the file found and the IP address of the terminal T2 of the received call acceptance request and finally transmits to the calling terminal T1 the IP address of the terminal

  called T2, through the Internet 1.

  After the cross transmission of the IP addresses, the two terminals TI, T2 activate an audible signal to warn their users of the communication between the two terminals T1, T2, and initiate the communication via the Internet 1. Furthermore, the server 3 updates tables 34 and 35,

as previously explained.

  2.2) If the call is refused, the terminal called T2 does not respond to the call notification from the server 3 and, after a predefined waiting time, the server 3 sends a call failure notification to the calling terminal Tl which alerts the user to the failure of the call by an audible warning signal. Another embodiment of the method makes it possible to establish communication between a client terminal of the server 3 and a terminal

ordinary, not a client of the server 3.

  By "ordinary" terminal is meant a terminal arranged to communicate through an ordinary telephone network, in this case the PSTN 2 network, but lacking the capacity to communicate through

the Internet 1.

  The server 3 is connected to a plurality of communication gateways 6 between the telephone network 2 and the Internmet 1 allowing terminals

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  ordinary to communicate through the Internet 1. All of these gateways

  being identical, one of them will now be described.

  The gateway 6 comprises an interface for connection to the telephone network 2, an interface for connection to the Internet 1, a central control unit, in this case a microprocessor, and, in memory, a gateway application between the telephone network 2 and the Internet 1 as well as a call management application for establishing communications, via the Internet 1, between a client terminal of the server 3 and a terminal

  1o ordinary telephone network 2.

  The gateway application allows the gateway 6, during a communication from an ordinary telephone terminal via the Internet 1, to - receive voice signals, transmitted by an ordinary telephone terminal through the telephone network 2 , transform them into voice data packets, according to the Internet communication protocols, and finally transmit the data packets through the Internet 1 and, conversely, - receive data packets transmitted through the Internet 1 , transform them into voice signals and finally transmit these signals to a

  telephone terminal through the telephone network 2.

  The call management application is compatible with the server call management application of server 3 and makes it possible to manage the call from a client terminal of server 3 by an ordinary telephone terminal and the call from a telephone terminal ordinary by a client terminal of the

  server 3, as will be explained in the description of the process.

  Gateway 6 has a telephone number on the network

  2 and a fixed IP address on the Internet 1.

  The method of establishing a communication between a client terminal of the server 3 and an ordinary telephone terminal will now be described. For the sake of clarity, only the different stages of the

  embodiment previously described will be explained.

  1) Call from the client terminal Tl to the ordinary terminal To To call the ordinary terminal To in order to communicate with it via the Internet 1, the client terminal Tl connects to the Internet 1 and address: ii l

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  to server 3 a call request from terminal To, similar to that

previously described.

  The server 3 searches the table 33 of the client terminals for a file for the terminal called To, using the telephone number thereof extracted from the call request, but, not finding one, deduces than

  the terminal called To is not a client terminal.

  The server 3 then selects a gateway 6 geographically close to the terminal called To, according to geographical indications contained in the telephone call number of the terminal called To, and transmits to

  this gateway 6 the call request from the terminal To.

  In addition, the server 3 creates and introduces a file for the terminal

  calling Ti in table 34 of the terminals awaiting communication.

  On receipt of the call request, the gateway 6 extracts the telephone call number from the terminal To and calls it through the network.

  2. A user of the To terminal answers the phone call.

  Gateway 6 notifies him by voice of the incoming call and asks him if he

agrees to take the call.

  If the call is accepted, the gateway 6 connects the terminal To to the Intermnet 1. It also sends to the server 3 a call acceptance request, similar to that previously described, containing an indication on the nature of the request, telephone number of the terminal

  called T1 and the IP address of gateway 6.

  The server 3 receives the call acceptance request, extracts the IP address of the gateway 6, extracts the IP address of the terminal T1 from the table 34 of the terminals awaiting communication, and finally transmits the IP address of the

  gateway 6 at terminal Tl and the IP address of terminal T1 at the gateway.

  The two terminals To and T1 can then communicate with each other, at

  through the Internet 1, via gateway 6.

  If the call fails, gateway 6 sends a notification of failure

  call server 3 which forwards it to the calling terminal T1.

  2) Call from the ordinary terminal To to the client terminal Tl

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  To call the terminal T1 in order to communicate with it via the Internet 1, under the control of a user, the terminal To calls one of the gateways 6 associated with the server 3. After establishment of the telephone communication between the terminal To and the gateway 6, s the user of the terminal To transmits to the gateway 6, at the latter's request, the telephone call number of the terminal TI, by numbering the latter,

  in order to make a call to the client terminal T1.

  The gateway 6 prepares a call request from the terminal T1 by the terminal To containing an indication of the nature of the request, the telephone call number of the calling terminal To and the IP address of the gateway 6 as well as the number d telephone call from the terminal called T1. It will be emphasized here that by establishing a telephone communication with the gateway 6,

  the terminal calling To therefore connects to the Internet 1.

  The server 3 receives the call request, verifies that the terminal called T1 belongs to the set 5 of client terminals, by searching for its telephone call number in table 33 of client terminals, and determines whether the terminal called T1 is listed in table 35 of

  terminals in communication.

  Furthermore, the server 3 introduces a file for the terminal calling To

  in table 34 of the terminals awaiting communication.

  In the case where the terminal called Tl is not in communication through the Internet 1, the server 3 calls through the telephone network 2 the terminal called Tl to notify him of the call, without picking up, as

previously explained.

  In the case where the terminal called T1 is in communication through the Internet 1, the server 3 transmits a call notification to it, through the Internet, using the terminal T1's current connection to

the Internet 1.

  In the event of acceptance of the call, the terminal called Tl sends a request for acceptance of the call to the server 3 and, after receipt thereof, the server 3 transmits the IP address of the gateway 6 to the terminal Tl and the IP address of the terminal T1 at the gateway 6. Furthermore, the server 3 updates the tables 34 and 35, by deleting from the table 34 the file for the terminal To and by

  introducing into table 35 a file for the client terminal T1.

} iilIF

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  If the call fails, the server 3 notifies it to the gateway 6 which itself

  even notify the user of the terminal To by voice. Furthermore, the server 3 updates the table 34 by deleting the file for the terminal To.5

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Claims (8)

  1- Method for establishing communication between two terminals (TI, T2) through a computer communication network (1), in which, the two terminals being connected to a telephone communication network (2), - the first of the two terminals (T1, T2) connects to the computer network in order to send a call request and communication server (3) of the computer network (1) for the purpose of notifying the second terminal (T2) of a call to communicate through the computer network (1), and - in the event of acceptance of the call, after connection of the second terminal (T2) to the computer network (1), the two terminals (TI, T2) each having a computer address on the computer network (1), the server (3) transmits to each terminal (T1, T2) the computer address of the other terminal (T2, T1).   2- The method of claim 1, wherein, in case of refusal of the call by the second terminal (T2), the server (3) notifies the first terminal (T1,) the call failed.   3- A method according to claims 1 and 2, wherein, in the case where the   second terminal (T2) is client of the server (3) and out of communication through the computer network (1), the server (3) calls the second terminal (T2), through the telephone network (2), the second terminal ( T2) identifies the caller, using identification data provided by a caller identification service, and interprets the call from the server (3) as a call notification to communicate across the network IT (1).   4- Method according to one of claims 1 to 3, wherein, in the case o   the second terminal (T2) is a client of the server (3) and during communication through the computer network (1), the server (3) transmits to the second terminal (T2) a call notification to communicate through the network IT (1), using the current connection of the   second terminal (T2) to the computer network (1).   - Method according to one of claims 1 to 4, wherein, in the case o   the second terminal (T2) is not a client of the server (3), the latter sends a call request from the second terminal (T2) to a gateway (6) between the 17 2786970   computer network (1) and the telephone network (2), said gateway (6) calls the second terminal (T2) through the telephone network (2) to   notify the call to a user of the second terminal (T2).   s 6- Method according to one of claims 1 to 5, wherein the server (3) manages a table listing terminals awaiting communication through the computer network and a table listing terminals in   communication courses through the computer network.   io 7- Communication terminal for implementing the method according to claim 1, arranged to communicate through the telephone communication network (2) and through the computer communication network (1), characterized in that it comprises means (23) for preparing a call request and addressing it to the call and connection server (3) and means (24) for detecting a call notification. 8- Terminal according to claim 7, wherein the means (24) for detecting a call notification are arranged to detect an incoming call from the server (3), using caller identification data   provided by a caller ID service.   9- Terminal according to one of claims 7 and 8, in which it is provided   means (25) for preparing a call acceptance request and send it to the server (3).   - Terminal according to one of claims 7 to 9, in which it is provided   means (26) for preparing a request for refusal of appeal and addressing it to the waiter (3).   11- Call and communication server for implementing the method according to claim 1, comprising means for connection to the computer network (1), means for connection to the telephone network (2), means (38) to receive a call request from a communication terminal and notify the call to said terminal, and means (37) for communicating at least two terminals across the network IT (1). 18 2786970   12- Server according to claim 11, wherein there is provided means (40) for notifying a call failure to a calling communication terminal.   13- Server according to one of claims 11 and 12, wherein it is provided   a table (34) listing a plurality of calling terminals awaiting communication through the computer network and means (41) for update said table.   1o 14- Server according to one of claims 11 to 13, in which it is provided   a table (35) listing a plurality of terminals during communication through the computer network and means (41) for update said table.