CN101155224A - Telephone system comprising telephone gateway and method for implementing telephone gateway function - Google Patents

Abstract

The present invention provides a telephony gateway, a telephone system including the same, and a method for executing the gateway function, which can save telephone charges by using VoIP, and when the other party of the call is not an IP phone, there is no need to pay additional service fees to the IP phone operator. The telephone system includes an IP phone device and a telephony gateway. The former is connected to an IP network, has a first IP address, and supports a first IP phone protocol; the latter is connected between a telephone network and the IP network, corresponds to a telephone number and a second IP address, and transcodes the incoming call signal received from the telephone network into an IP phone signal that complies with the first IP phone protocol, and transmits it to the former via the IP network to establish a telephone connection. The destination telephone number of the incoming call signal is the telephone number, and the destination IP address of the IP phone signal is the first IP address.

Description

Telephone system including telephone gateway and method for realizing function of telephone gateway

technical field

The invention relates to a telephone communication device and method, in particular to a telephone gateway, a telephone system including it and a method for executing the gateway function.

Background technique

For people who often travel abroad or travel abroad, if they often communicate with China by telephone, it will cost a lot of international communication fees. For example, if you use a mobile phone, you need to pay for international roaming charges whether you make a call back to China or receive a call from China; International call charges. Although, there are Internet Protocol (Internet Protocol, referred to as IP) telephone (Voice over IP, referred to as VoIP) services now, you can use IP telephones abroad, and contact callers who also use IP telephones in China via the Internet to save phone charges. However, if the domestic caller does not have an IP phone or is inconvenient to use an IP phone, the foreign caller still needs to call the domestic caller's mobile phone or fixed-line phone. At this time, if a foreign caller wants to make a domestic call through an IP phone, he needs to spend additional money to apply for the service of the IP phone company. If you want to receive calls from domestic mobile phones or fixed-line phones abroad, you need to apply for the SkypeIn service. In this case, the Skype carrier service fee is still required. In addition, when we are abroad, if the other party calls our domestic home or company fixed-line phone, it cannot be transferred to the IP phone we use abroad, resulting in missed calls.

Contents of the invention

In view of this, an object of the present invention is to provide a kind of telephone gateway (telephony gateway), the telephone system comprising it and the method for performing gateway function thereof, can utilize IP telephone to save call charge, and when the other side of conversation is not IP telephone At this time, there is no need to pay additional service fees to the IP phone operator.

Another object of the present invention is to provide a telephone gateway, a telephone system including it and a method for performing gateway functions thereof, which can dial the other party to our fixed-line phone or mobile phone but we cannot answer the phone, Transfer to my IP phone via an IP network (such as the Internet). In this way, when we are anywhere in the world, as long as we can connect to the IP network using the IP telephone device, we can never miss a call.

In one embodiment of the present invention, a telephone gateway is disclosed, which is connected between a telephone network and an IP network. The telephone gateway includes: a telephone network interface, corresponding to a telephone number, and receiving an incoming call signal from the telephone network, wherein the destination telephone number of the incoming call signal is the telephone number; A positioning unit, used to judge whether an IP telephone device is connected to the IP network, wherein the IP telephone device has a first IP address, and supports a first IP telephone protocol; a transcoding (transcoding) unit, coupled to The telephone network interface and the positioning unit are used to transcode the incoming signal into a first IP telephone signal conforming to a first IP telephone protocol when the IP telephone device is connected to the IP network, wherein The destination IP address of the first IP telephone signal is the first IP address; and an IP interface, coupled to the transcoding unit and the positioning unit, the IP interface corresponds to the second IP address, and passes through the The IP network transmits the first IP telephone signal to the IP telephone device to establish a telephone connection.

In another embodiment of the present invention, a telephone system is disclosed, which includes: an IP telephone device, connected to an IP network, having a first IP address, and supporting a first IP telephone protocol; and a telephone gateway , connected between a telephone network and the IP network, corresponding to a telephone number and a second IP address, and transcoding an incoming signal received from the telephone network into a first IP conforming to the first IP telephone protocol A telephone signal is sent to the IP telephone device via the IP network to establish a telephone connection. Wherein, the destination phone number of the incoming signal is the phone number, and the destination IP address of the first IP phone signal is the first IP address.

In yet another embodiment of the present invention, a method for performing the function of a telephone gateway is disclosed, which is used in a telephone gateway, the telephone gateway is connected between a telephone network and an IP network, and corresponds to a telephone number and second IP address. The method includes the following steps: receiving an incoming signal from the telephone network, wherein the destination telephone number of the incoming signal is the telephone number; judging whether an IP telephone device is connected to the IP network, wherein the The IP telephony device has a first IP address and supports a first IP telephony protocol; when the IP telephony device is connected to the IP network, the incoming signal is transcoded into a first IP conforming to the first IP telephony protocol A telephone signal, wherein the destination IP address of the first IP telephone signal is the first IP address; and transmitting the first IP telephone signal to the IP telephone device via the IP network to establish a telephone connection.

Description of drawings

Fig. 1 is the architecture diagram of the first embodiment of the telephone system of the present invention;

Fig. 2 is the architecture diagram of the second embodiment of the telephone system of the present invention;

Fig. 3 is the architecture diagram of the third embodiment of the telephone system of the present invention;

Fig. 4 is the block diagram of a preferred embodiment of the telephony gateway device of Fig. 1;

Fig. 5 is the flow chart of an embodiment of executing the gateway function of receiving PSTN network incoming call;

Fig. 6 is the flow chart of an embodiment of executing the gateway function of receiving IP network incoming call;

Fig. 7 is the flow chart of an embodiment of executing the gateway function of sending a call to a call-receiving end device via the PSTN network;

FIG. 8 is a flowchart of an embodiment for performing a gateway function for calling another IP telephony device via an IP network.

Explanation of reference signs: 10, 20, 30-telephone system; 11, 15, 31-IP telephone device; 12, 22, 32-telephone gateway; 121-PSTN interface; 122-positioning unit; 123-transcoding unit; 124-authentication unit; 125-call rejection processing unit; 126-extended function unit; 127-IP interface; 13-IP network; 14-PSTN network; 24-PLMN network; 36-location server; 361-correspondence table; 56-Execute the flow of an embodiment of the gateway function for receiving incoming calls from the PSTN network; 60-66-Execute the flow of an embodiment of the gateway function for receiving incoming calls from the IP network; 70-74-Execute the process of sending calls to a receiver via the PSTN network A flow of an embodiment of the gateway function of the device; 80-84—a flow of an embodiment of executing the gateway function of sending a call to another IP telephone device through the IP network.

Detailed ways

FIG. 1 is a structural diagram of the first embodiment of the telephone system of the present invention. As shown in the figure, the telephone system 10 includes an IP telephone device 11 and a telephone gateway 12 . The IP telephone device 11 is connected to the telephone gateway 12 via an IP network 13, has a first IP address, and supports a first IP telephone protocol (VoIP protocol1). The IP network 13 generally refers to any network that uses IP addresses for addressing and communication, such as the Internet or a local area network (LAN) that uses IP addresses. The first IP telephony protocol is not limited, and can generally refer to any communication protocol that can control and manage the transmission of voice signals on the IP network, such as the Session Initiation Protocol (SIP for short) and H.323 that have become industry standards, or Protocols developed by other vendors themselves. In addition, the IP telephony device 11 can be any type of electronic device, as long as it can connect to the IP network 13 in a wired or wireless manner and supports the first IP telephony protocol. For example, portable devices (mobile phones, notebook computers, personal digital assistants (PDAs), etc.), personal computers (PCs), plain old telephones with integrated access devices (IADs) , referred to as POT) and so on. The telephone gateway 12 is connected between a public switched telephone network (PSTN for short) 14 and an IP network 13, and corresponds to a PSTN telephone number and a second IP address. The telephone gateway device 12 can perform the following gateway functions: receiving an incoming call from the PSTN network 14, receiving an incoming call from the IP network 13, sending a call via the PSTN network 14 to a receiving end device (not shown) and sending a call via the IP network 13 to another IP telephony device 15 . The execution methods of each gateway function are described below:

(1) receive the incoming call of PSTN network 14: when telephone gateway device 12 receives a PSTN incoming call signal (its destination telephone number is the PSTN telephone number of telephone gateway device 12) from PSTN network 14, it will be transcoded into The first IP telephony signal conforming to the first IP telephony protocol (the destination IP address is the first IP address of the IP telephony device 11 ) is sent to the IP telephony device 11 via the IP network 13 to establish a telephony connection.

(2) receiving incoming call of IP network 13: when telephone gateway device 12 receives an IP telephone incoming call signal (its purpose IP address is the second IP address of telephone gateway device 12) from IP network 13, it will be transferred The code is a second IP telephony signal conforming to the first IP telephony protocol (its destination IP address is the first IP address), which is sent to the first IP telephony device 11 via the IP network 13 to establish a telephone connection.

In other words, when the telephone gateway 12 is located in the home or office of the user, the incoming calls of the PSTN network 14 or IP network 13 can be transferred to the IP telephone through the gateway functions of (1) and (2) above. device 11. Therefore, when the user is not at home or in the office, no matter where he is located (domestic or abroad), as long as he can connect to the IP network 13 through the IP telephone device 11, he can receive the call originally made to his home or office. And you don't have to pay any call charges. In addition, the telephone gateway 12 can also be connected with a traditional telephone device. When the user is at home or in the office, he can directly use the traditional telephone device to answer the incoming calls of the PSTN network 14 without switching.

In a first preferred embodiment, when the IP telephone device 11 receives the aforementioned first or second IP telephone signal, it will perform an authentication action to determine whether to allow the establishment of the telephone connection. The authentication action is used to confirm that the first or second IP telephony signal is sent by the telephony gateway 12 to filter incoming calls from unknown sources. The implementation of the authentication action is not limited, for example, it can be authenticated by judging whether the first or second IP telephone signal contains a specific identification code of the telephone gateway 12, and if so, the establishment of the telephone connection is allowed, otherwise, it is not allowed.

(3) Sending a call to a receiving terminal device through the PSTN network 14: when the telephone gateway device 12 receives the first IP telephone call signal sent by the IP telephone device 11 from the IP network 13 (its destination IP address and destination phone number are respectively The second IP address of the telephone gateway device 12 and a telephone number of the receiving terminal), the first IP phone call signal will be transcoded into a PSTN signal, and transmitted to the corresponding telephone number of the receiving terminal through the PSTN network 14 The receiving end device is used to establish a telephone connection. Please note that since the PSTN network 14 can be interconnected with a public land mobile network (PLMN for short), the receiving end device can be a mobile phone in addition to a PSTN phone device.

(4) Send a call to the IP phone device 15 via the IP network 13: here the IP phone device 15 corresponds to an IP phone code (note: the IP phone does not necessarily use a number to identify, so the code covers various forms of identification codes here ), and support the second IP telephony protocol. The second IP telephony protocol is not limited, and can generally refer to any communication protocol that can control and manage the transmission of voice signals on the IP network. When the telephone gateway device 12 receives the second IP telephone call signal sent by the IP telephone device 11 from the IP network 13 (the destination IP address and the destination telephone code are respectively the second IP address of the telephone gateway device 12 and the IP telephone device 15's IP phone code), the second IP phone call signal will be transcoded into a third IP phone signal conforming to the second IP phone protocol, and sent to the IP phone device 15 via the IP network 13 to establish a phone connection.

In other words, when the telephone gateway 12 is located in the home or office of the user, through the gateway functions of (3) and (4), when the user is not at home or office, no matter where he is, as long as He can connect to the IP network 13 through the IP telephone device 11, and can dial to other PSTN telephone devices, mobile phones or IP telephone devices through the telephone gateway 12. When the user is located abroad and dials domestically, because it is first connected to the domestic telephone gateway 12 through the IP network 13 and then transferred, the user only needs to bear the domestic part of the call fee, and can save the international part. phone bill.

In a second preferred embodiment, when the telephone gateway device 12 receives the aforementioned first or second IP telephone call signal, it will perform an authentication action to determine whether to allow the IP telephone device 11 to communicate with the aforementioned called-end device or The IP telephone device 15 establishes a telephone connection. The authentication action is used to confirm that the first or second IP telephone call signal is sent by the IP telephone device 11, so as to prevent other unauthenticated IP telephone devices from using the telephone gateway 12 to make calls. The implementation of the authentication action is not limited, for example, it can be authenticated by judging whether the first or second IP phone call signal contains a specific identification code of the IP phone device 11, if so, allow the establishment of a phone connection, otherwise not allow .

Fig. 2 is the structural diagram of the second embodiment of the telephone system of the present invention, and its main difference with Fig. 1 is that the telephone gateway 22 that the telephone system 20 comprises is connected between a PLMN network 24 and the IP network 13, and Corresponding to a mobile phone number (telephone gateway 22 is still corresponding to the second IP address). As for the gateway functions of (1) and (3), they are respectively changed to receive incoming calls from the PLMN network 24 and send calls to a receiving end device via the PLMN network 24, while the gateway functions of (2) and (4) remain unchanged. Change. When receiving an incoming call from the PLMN network 24, the telephone gateway device 22 receives a PLMN incoming call signal (its destination phone number is the mobile phone number of the telephone gateway device 22) from the PLMN network 24, and transcodes it to conform to the first A fourth IP telephony signal (the destination IP address of which is the first IP address) of an IP telephony protocol is sent to the IP telephony device 11 via the IP network 13 to establish a telephony connection. When sending a call to a call-receiving end device through the PLMN network 24, the telephone gateway device 22 receives the third IP telephone call signal sent by the IP telephone device 11 from the IP network 13 (its destination IP address and destination phone number are respectively the first Two IP addresses and a telephone number of the receiving terminal), and the third IP telephone call signal is transcoded into a PLMN signal, which is transmitted to the receiving terminal device corresponding to the telephone number of the receiving terminal through the PLMN network 24, so as to establish A telephone connection.

Fig. 3 is the structural diagram of the third embodiment of the telephone system of the present invention, and its main difference with Fig. 1 is that, besides the telephone gateway 32 and the IP telephone device 31, the telephone system 30 also includes a network connected to the IP network 13 The positioning server 36. In the third embodiment, the IP telephone device 31 and the telephone gateway 32 correspond to the first and second IP addresses respectively. Before the IP telephone device 31 and the telephone gateway 32 communicate, they need to know each other's IP address. When both parties have fixed IP addresses, the fixed IP address of the other party can be pre-recorded on our side so that it can be used when communicating with the other party. However, if either party is a floating IP address, the other party is difficult to record in advance like a fixed IP address. Therefore, the function of the positioning server 36 is that when at least one of the first and second IP addresses is a floating IP address, when the IP telephone device 31 communicates with the telephone gateway 32, the party with the floating IP address can Being located by the other party, that is, the other party can know what the floating IP address is.

The positioning server 36 includes a correspondence table 361, which can record the corresponding relationship between the specific identification code of the party with the floating IP address and the floating IP address. In this way, as long as the other party has recorded the specific identification code in advance, it can be based on the specified identification code. The specific identification code queries the corresponding table 361 to obtain the floating IP address. For example, when the first IP address of the IP telephone device 31 is a floating IP address, the IP telephone device 31 registers with the positioning server 36, so that the correspondence table 361 records the first IP address and the first identification of the IP telephone device 31. Correspondence between codes. The first identification code is pre-recorded in the telephone gateway 32, and the telephone gateway 32 can query the corresponding table 361 according to the first identification code to obtain the first IP address. For another example, when the second IP address of the telephone gateway 32 is a floating IP address, the telephone gateway 32 registers with the positioning server 36, so that the correspondence table 361 records the second IP address and the second IP address of the telephone gateway 32. Correspondence between identification codes. Similarly, the second identification code is pre-recorded in the IP telephone device 31, and the IP telephone device 31 can query the corresponding table 361 according to the second identification code to obtain the second IP address. The forms of the aforementioned first and second identification codes are not limited. For example, a media access address (MAC address) possessed by each IP network device can be used as the identification code.

FIG. 4 is a block diagram of a preferred embodiment of the telephony gateway 12 of FIG. 1 . As shown in Figure 4, the telephone gateway device 12 comprises a PSTN interface 121, a positioning unit 122, a transcoding unit 123, an authentication unit 124, a call rejection (call rejection) processing unit 125, an extended function unit 126 and a IP interface 127. Among them, the PSTN interface 121 is connected to the PSTN network 14, and corresponds to the PSTN telephone number in the telephone gateway 12; the positioning unit 122 is used to determine whether the IP telephone device 11 is connected to the IP network 13; the transcoding unit 123 is used to perform PSTN signals Transcoding between IP telephone signals, or between IP telephone signals of different IP telephone protocols; authentication unit 124 is used to perform the authentication action described in the aforementioned second preferred embodiment; call rejection processing unit 125 is used to connect When it cannot be established, execute a call rejection procedure; the IP interface is connected to the IP network 13 and corresponds to the second IP address of the telephone gateway 12 . The extended function unit 126 is used to provide at least one of the following additional functions: call recording, caller ID display, incoming call filtering, extension function, conference call (conference call), call hold, speed dial and call information statistics.

The following respectively describe the telephone gateway device 12 when performing the gateway functions of the aforementioned (1) to (4), its internal mode of operation:

(A) When receiving an incoming call from the PSTN network 14, the PSTN interface 121 receives the PSTN incoming call signal from the PSTN network 14, and when the positioning unit 122 judges that the IP telephone device 11 is connected to the IP network 13, the transcoding unit 123 sends The PSTN incoming signal is transcoded into the aforementioned first IP telephone signal, and the IP interface 127 transmits the first IP telephone signal to the IP telephone device 11 via the IP network 13 to establish a telephone connection.

(B) When receiving an incoming call from the IP network 13, the IP interface 127 receives the incoming signal of the IP phone from the IP network 13, and the transcoding unit 123 judges in the positioning unit 122 that the IP phone device 11 is connected to the IP network 13 At this time, the IP telephone incoming signal is transcoded into the aforementioned second IP telephone signal, and the IP interface 127 transmits the second IP telephone signal to the IP telephone device 11 via the IP network 13 to establish a telephone connection.

(C) When making a call to a call-receiving end device through the PSTN network 14, the IP interface 127 receives the first IP phone call signal from the IP network 13, and the transcoding unit 123 converts the first IP phone call signal after being authenticated by the authentication unit 124. The phone call signal is transcoded into the aforementioned PSTN signal, and the PSTN interface 121 transmits the PSTN signal to the receiver device through the PSTN network 14 to establish a phone connection.

(D) When sending a call to the IP phone device 15 via the IP network 13, the IP interface 127 receives the second IP phone call signal from the IP network 13, and the transcoding unit 123 sends the second IP phone call signal to the second IP phone after being authenticated by the authentication unit 124. The calling signal is transcoded into the aforementioned third IP phone signal, and the IP interface 127 transmits the third IP phone signal to the IP phone device 15 via the IP network 13 to establish a phone connection.

In the aforementioned (A) to (D), when the telephone connection cannot be established, the call rejection processing unit 125 executes the call rejection procedure, such as recording the voice message sent by the calling end device, or transferring the incoming call signal to a preset set the receiver device.

The descriptions in FIG. 5 to FIG. 8 below are respectively embodiments of the method for performing the aforementioned (1) to (4) gateway functions of the present invention. FIG. 5 is a flowchart of an embodiment for performing the gateway function for receiving incoming calls from the PSTN network 14 . As shown in Figure 5, this process includes the following steps:

Step 50: receiving the PSTN incoming signal of the aforementioned (1) from the PSTN network 14;

Step 51: Determine whether the IP telephone device 11 is connected to the IP network 13, if not, go to step 55, and if so, go to step 52;

Step 52: transcoding the PSTN incoming signal into a first IP telephone signal;

Step 53: Send the first IP telephone signal to the IP telephone device 11 via the IP network 13 to establish a telephone connection;

Step 54: Determine whether the telephone connection is established, if not, skip to step 55, and if so, skip to step 56;

Step 55: Execute the call rejection procedure, and end the process; and

Step 56: Maintain the phone connection until the call ends.

FIG. 6 is a flow chart of an embodiment for performing the gateway function for receiving incoming calls from the IP network 13 . As shown in Figure 6, this process includes the following steps:

Step 60: receiving the IP telephone incoming signal of the aforementioned (2) from the IP network 13;

Step 61: Determine whether the IP telephone device 11 is connected to the IP network 13, if not, go to step 65, and if so, go to step 62;

Step 62: transcoding the incoming IP phone signal into a second IP phone signal;

Step 63: Send the second IP telephone signal to the IP telephone device 11 via the IP network 13 to establish a telephone connection;

Step 64: Determine whether the telephone connection is established, if not, skip to step 65, and if so, skip to step 66;

Step 65: Execute the call rejection procedure, and end the process; and

Step 66: Maintain the phone connection until the call ends.

FIG. 7 is a flow chart of an embodiment for performing a gateway function for making a call to a call-end device via the PSTN network 14 . As shown in Figure 7, this process includes the following steps:

Step 70: receiving the first IP phone call signal of the aforementioned (3) from the IP network 13;

Step 71: Decide whether to allow the IP phone device 11 to establish a telephone connection with the called-end device, if allowed, go to step 73, if not, go to step 72;

Step 72: Execute the call rejection procedure, and end the process;

Step 73: transcoding the first IP phone call signal into a PSTN signal; and

Step 74 : Send the PSTN signal to the receiver device via the PSTN network 14 to establish a phone connection.

In step 71, it is determined whether to allow the IP telephone device 11 to establish a telephone connection with the receiving end device according to whether the first IP telephone call signal includes the specific identification code of the IP telephone device 11.

FIG. 8 is a flow chart of an embodiment for performing the gateway function of calling to the IP telephony device 15 via the IP network 13 . As shown in Figure 8, this process includes the following steps:

Step 80: receiving the second IP telephone call signal of the aforementioned (4) from the IP network 13;

Step 81: Decide whether to allow the IP phone device 11 to establish a phone connection with the IP phone device 15, if allowed, go to step 83, if not, go to step 82;

Step 82: Execute the call rejection procedure, and end the process;

Step 83: transcoding the second IP phone call signal into a third IP phone signal; and

Step 84: Send the third IP telephony signal to the IP telephony device 15 via the IP network 13 to establish a telephony connection.

In step 81 , it is determined whether to allow the IP telephone device 11 to establish a telephone connection with the IP telephone device 15 according to whether the second IP telephone call signal includes the specific identification code of the IP telephone device 11 .

The above descriptions are only preferred embodiments of the present invention, and are only illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims (18)

1. a telephony gateway device is connected between a telephone network and an ip network, it is characterized in that, described telephony gateway device comprises:

One telephone network interface corresponding to a telephone number, and receives a calling signal from described telephone network, and the purpose telephone number of wherein said calling signal is described telephone number;

Whether locating unit is connected described IP network in order to judge an IP phone device, and wherein said IP phone device has one the one IP address, and supports one first IP phone agreement;

One transcoding units, couple mutually with described telephone network interface and described positioning unit respectively, in order to when described IP phone device is connected described IP network, with described calling signal transcoding is the one first IP phone signal that meets the described first IP phone agreement, and the purpose IP address of the wherein said first IP phone signal is a described IP address; And

One IP interface couples mutually with described transcoding units and described positioning unit respectively, corresponding one the 2nd IP address of described IP interface, and the described first IP phone signal is sent to described IP phone device via described IP network, to set up a telephone connection.

2. telephony gateway device as claimed in claim 1 is characterized in that, described telephone network be PSTN and public land mobile network one of them.

3. telephony gateway device as claimed in claim 2, wherein said IP interface receives an IP phone calling signal from described IP network, one purpose IP address of described IP phone calling signal is described the 2nd IP address, when described transcoding units is connected described IP network at described IP phone device, with described IP phone calling signal transcoding is the one second IP phone signal that meets the described first IP phone agreement, one purpose IP address of the described second IP phone signal is a described IP address, and described IP interface is sent to described IP phone device with the described second IP phone signal via described IP network, to set up a telephone connection.

4. telephony gateway device as claimed in claim 2, wherein said IP interface receives a IP phone that described IP phone device the sends signal of giving orders or instructions from described IP network, a give orders or instructions purpose IP address and the purpose telephone number of signal of described IP phone is respectively described the 2nd an IP address and a callee telephone number, described transcoding units is a telephone signal with the described IP phone signal transcoding of giving orders or instructions, and described telephone network interface transmits described telephone signal to the pairing callee device of described callee telephone number via described telephone network, to set up a telephone connection.

5. telephony gateway device as claimed in claim 2, wherein said IP interface receives a IP phone that described IP phone device the sends signal of giving orders or instructions from described IP network, described IP phone give orders or instructions a purpose IP address of signal and the IP phone code that a purpose telephone code is respectively described the 2nd an IP address and a callee device, described callee device is supported one second IP phone agreement, described transcoding units is one the 3rd IP phone signal that meets the described second IP phone agreement with the described IP phone signal transcoding of giving orders or instructions, and described IP interface transmits described the 3rd IP phone signal to described callee device via described IP network, to set up a telephone connection.

6. telephony gateway device as claimed in claim 1 is characterized in that, also comprises:

One authentication ' unit is coupled between described positioning unit and the described transcoding units, and in order to when described IP interface receives that described IP phone is given orders or instructions signal, described IP phone device whether is permitted in decision and described callee device is set up described telephone connection.

7. telephony gateway device as claimed in claim 3, it is characterized in that, described authentication ' unit is whether to comprise a specific identification code of described IP phone device according to the described IP phone signal of giving orders or instructions, and described IP phone device whether is permitted in decision and described callee device is set up described telephone connection.

8. telephony gateway device as claimed in claim 2, wherein when a described IP address is floating IP address, described IP phone device is registered at a location-server that is connected described IP network, so that the corresponding table record in the described location-server has the corresponding relation between one first identification code of a described IP address and described IP phone device, wherein said first identification code is to be recorded in described positioning unit, described positioning unit is to inquire about described correspondence table according to described first identification code, to learn a described IP address.

9. telephony gateway device as claimed in claim 8, wherein when described the 2nd IP address is floating IP address, described telephony gateway device is registered at described location-server, so that described correspondence table records the corresponding relation between one second identification code of described the 2nd IP address and described telephony gateway device.

10. a telephony gateway device is connected between a telephone network and an ip network, it is characterized in that, described telephony gateway device comprises:

One IP interface, corresponding one the 2nd IP address, and receive a IP phone that an IP phone device the sends signal of giving orders or instructions from described IP network, the give orders or instructions purpose IP address and the purpose telephone number of signal of wherein said IP phone is respectively described the 2nd an IP address and a callee telephone number, described IP phone device has one the one IP address, and supports one first IP phone agreement;

One transcoding units is coupled to described IP interface, is a telephone signal in order to signal transcoding that described IP phone is given orders or instructions; And

One telephone network interface, be coupled to described transcoding units, described telephone network interface correspondence is at a telephone number, and transmits described telephone signal to the pairing callee device of described callee telephone number, to set up a telephone connection via described telephone network;

Wherein, described telephone network be a PSTN and public land action network one of them.

11. a telephone system is characterized in that it comprises:

One internet-protocol telephony device is connected to an IP network, and has one the one IP address, supports one first IP phone agreement; And

One telephony gateway device, be connected between a telephone network and described IP network, corresponding to a telephone number and one the 2nd IP address, and a calling signal transcoding that will be received from described telephone network is the one first IP phone signal that meets the described first IP phone agreement, be sent to described IP phone device via described IP network, to set up a telephone connection, one purpose telephone number of wherein said calling signal is described telephone number, and a purpose IP address of the described first IP phone signal is a described IP address.

12. telephone system as claimed in claim 11, wherein said IP phone device is carried out an acts of authentication when receiving the described first IP phone signal, whether permits setting up described telephone connection with decision.

13. comprising, telephone system as claimed in claim 12, wherein said acts of authentication judge whether the described first IP phone signal comprises a specific identification code of described telephony gateway device.

14. telephone system as claimed in claim 11 is characterized in that, it also comprises:

One location server is connected described IP network, and comprises a correspondence table;

Wherein, when a described IP address is floating IP address, described IP phone device is registered at described location-server, so that described correspondence table records the corresponding relation between one first identification code of a described IP address and described IP phone device, wherein said first identification code is to be recorded in described telephony gateway device, described telephony gateway device is inquired about described correspondence table according to described first identification code, to learn a described IP address.

15. telephone system as claimed in claim 14, wherein when described the 2nd IP address is floating IP address, described telephony gateway device is registered at described location-server, so that described correspondence table records the corresponding relation between one second identification code of described the 2nd IP address and described telephony gateway device.

16. a telephone system is characterized in that it comprises:

One internet-protocol telephony device is connected to an IP network, and has one the one IP address, supports one first IP phone agreement; And

One telephony gateway device, be connected between a telephone network and described IP network, corresponding to a telephone number and one the 2nd IP address, and receive a IP phone that described IP phone device the sends signal of giving orders or instructions from described IP network, and be a telephone signal with the described IP phone signal transcoding of giving orders or instructions, be sent to a callee device via described telephone network, setting up a telephone connection, wherein said IP phone give orders or instructions a purpose IP address of signal and the callee telephone number that a purpose telephone number is respectively described the 2nd IP address and described callee device;

Wherein, described telephone network be a PSTN and public land action network one of them.

17. the method for a telephony gateway device gateway function, be to be used for a telephony gateway device, described telephony gateway device is connected between a telephone network and an ip network, and corresponding to a telephone number and one the 2nd IP address, it is characterized in that described method comprises the following step:

Receive a calling signal from described telephone network, the purpose telephone number of wherein said calling signal is described telephone number;

Judge whether an IP phone device is connected described IP network, and wherein said IP phone device has one the one IP address, and support one first IP phone agreement;

When described IP phone device is connected described IP network, be the one first IP phone signal that meets the described first IP phone agreement with described calling signal transcoding, the purpose IP address of the wherein said first IP phone signal is a described IP address; And

Via described IP network the described first IP phone signal is sent to described IP phone device, to set up a telephone connection.

18. the method for a telephony gateway device gateway function, it is to be used for a telephony gateway device, and described telephony gateway device is connected between a telephone network and an ip network, and corresponding to a telephone number and one the 2nd IP address, it is characterized in that described method comprises the following step:

Receive a IP phone that an IP phone device the sends signal of giving orders or instructions from described IP network, the give orders or instructions purpose IP address and the purpose telephone number of signal of wherein said IP phone is respectively described the 2nd an IP address and a callee telephone number;

With the described IP phone signal transcoding of giving orders or instructions is a telephone signal; And

Transmit described telephone signal to the pairing callee device of described callee telephone number, to set up a telephone connection via described telephone network.

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