CN1953489B - Data packet transmission path control method, network telephone system and wireless network telephone - Google Patents

Abstract

A data packet transmission path control method, a network telephone system and a wireless network telephone are provided. The method comprises the following steps: first, a first connection between a wireless network phone and a wireless local area network is established. Then, a second connection between the wireless network phone and a GPRS network is established. Then, according to a signal strength of the first connection received by the wireless network phone, it is determined whether a transmission path of a plurality of data packets exchanged by a session set established by using a network telephony technology between the wireless network phone and another network phone is via the first connection or the second connection. The invention can avoid the problem of disconnection caused by insufficient signal strength when a user of the wireless network phone is in a moving state or is influenced by an obstacle.

Description

Data packet transmission path control method, network telephone system and wireless network telephone

technical field

The present invention relates to a wireless network phone, in particular to a wireless network phone that simultaneously supports a wireless local area network communication standard and a general packet radio service (General Packet Radio Service, GPRS) communication standard.

Background technique

The Wi-Fi communication standard is a general term for a group of communication standards for Wireless Local Area Network (WLAN), including standards such as 802.11a and 802.11b compatible with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specification. Due to the prevalence of wireless networks, the Wi-Fi communication standard has been widely adopted by the industry.

Due to the popularity of the Internet, many standards have been born to use the Internet to transmit voice data. The general Internet protocol telephone (IP telephony) uses H.323, SIP, MGCP and other standards to transmit call control signals, and uses the user datagram protocol (user datagram protocol, UDP) in the TCP/IP protocol. Send voice data. Of course, the wireless Internet phone can transmit voice data through the physical layer (physical layer) of the wireless local area network conforming to the Wi-Fi standard. Nowadays, there are many Wi-Fi phones, which use the Wi-Fi standard to transmit the communication data of the wireless network phone by means of a wireless local area network.

However, since the Wi-Fi phone is a wireless phone, the user is often on the move. Because IEEE 802.11b, which has the largest geographic coverage in the current Wi-Fi standard, is only 300 feet away from the access point, users are often disconnected during calls due to insufficient signal reliability. Wire.

In addition, due to the popularity of mobile communications at present, the wireless telephone network of the Global System for Mobile Communications (GSM) has been widely distributed in various places. At this time, the technology of using the wireless telephone network of the Global System for Mobile Communications (GSM) to transmit data conforming to the Internet Protocol (internet protocol), the so-called General Packet Radio Service (GPRS) system appears. It is very important so that the original GSM wireless telephone network in the form of circuit switch can also transmit Internet data in the form of packet switch.

At present, there is a technology that simultaneously supports different types of wireless networks, so that the same communication session (communication session) can simultaneously use different types of wireless networks to transmit the data of the communication session set. For example, U.S. Patent No. US2005/0013264A1 describes how to enable a mobile terminal to exchange access rights (switching access) between two different wireless networks. The authentication information (authentication information) of the same communication session set is exchanged between two different wireless networks, so as to identify the communication session between the two different wireless networks.

Contents of the invention

Because wireless VoIP can transmit voice data through different physical layers, whether it is through Wi-Fi or other standard wireless local area networks, or through the GPRS system or through the GSM wireless telephone network, It can transmit voice data of wireless network phone. Therefore, in order to solve the problem that when a wireless network phone uses a wireless local area network to make a call, it is easy to disconnect the communication session due to insufficient signal strength of the connection between the wireless local area network and the phone because the user of the phone is in a moving state or is affected by obstacles. In order to solve the problem of wires, the present invention provides a method for dynamically controlling the transmission path of the data packet of the wireless network phone, so that when the wireless local area network connection signal is weakened, the GPRS network is used to transfer the IP data packet of the wireless network phone. to maintain the call.

In one embodiment, the present invention provides a method for dynamically controlling the transmission path of the data packet of the wireless network phone. The method includes the following steps: first, establish a first connection between a wireless network phone and a wireless local area network (wireless local area network, WLAN). Then a second connection between the wireless network phone and a general packet radio service (GPRS) network is established. Then use VoIP (voice over internet protocol, VoIP) technology, via the first connection and the second connection, to establish a conversation set (conversations session) between the wireless network phone and the other party's network phone; detect the second A signal strength of a connection; when the signal strength is greater than a preset threshold, select the first connection with low signal penetration capability as a data packet transmission path of the session set; and when the signal strength is less than When the preset threshold is reached, the second connection with high signal penetration capability is selected as the data packet transmission path of the session set.

In the method for controlling the transmission path of data packets according to the present invention, wherein the first connection and the second connection are connected to the other party's network phone via an Internet.

In the method for controlling the transmission path of data packets of the present invention, the second connection is kept in a continuous online state when the session set is in progress.

The method for controlling the delivery path of data packets according to the present invention, wherein selecting the first connection as the delivery path includes the following steps: obtaining an IP address of a gateway of the wireless local area network; The network address is set as the IP address; the data packet is sent from the wireless network phone to the gateway; and the data packet is sent to the other party's network phone via the Internet.

The method for controlling the delivery path of data packets according to the present invention, wherein selecting the second connection as the delivery path includes the following steps: obtaining an IP address of a gateway of the GPRS network; The IP address is set as the default routing network address; the data packet is sent from the wireless network phone to the gateway; and the data packet is sent to the other network phone via the Internet.

In the method for controlling the transmission path of data packets of the present invention, the signal strength is detected by using a received signal strength indicator.

In the method for controlling the transmission path of data packets in the present invention, the wireless local area network is a wireless local area network conforming to IEEE 802.11 series or IEEE 802.16 series standards.

In the method for controlling the transmission path of the data packet according to the present invention, the wireless network phone includes a personal computer, a personal digital assistant and/or a mobile phone.

In another embodiment, the present invention provides an IP telephony system. The VoIP system includes: a wireless local area network (wireless local area network, WLAN); a general packet radio service (general packet radio service) network; an Internet (Internet), coupled to the wireless local area network and the general packet radio service network ; an other party's network phone, coupled to the Internet; and a wireless network phone. The wireless network phone includes: a wireless local area network module for establishing a first connection with the wireless local area network, and the wireless local area network module further includes a received signal strength indicator (received signalstrength indicator, RSSI) for Displaying a signal strength of the first connection; and a GPRS network module for establishing a second connection with the GPRS network; wherein the wireless network phone is connected to the other network between the wireless network phone and the other network A conversation session is established between the phones using voice over internet protocol (VoIP) technology, and when the signal strength is greater than a preset threshold, the first connection with low signal penetration capability is selected as the conversation a data packet transmission path of the session set; and when the signal strength is lower than the preset threshold, selecting the second connection with high signal penetration capability as the data packet transmission path of the session set.

The Internet telephone system of the present invention, wherein the wireless local area network is a wireless local area network conforming to IEEE 802.11 series or 802.16 series standards.

According to the Internet telephony system of the present invention, the second connection is kept in a continuous online state during the progress of the session set.

In the VoIP system of the present invention, when it is determined that the delivery path is via the first connection, the wireless IP phone can set the default routing network addresses of the plurality of data packets to one of the wireless local area networks. The network address of the gateway, so as to send the plurality of data packets to the gateway through the wireless local area network module, and then transmit to the other party's network phone through the Internet.

In the VoIP system of the present invention, when determining that the delivery path is via the second connection, the wireless IP phone can set the default routing network addresses of the plurality of data packets to be included in the GPRS network The network address of a gateway in order to send the plurality of data packets to the gateway via the GPRS network module, and then transmit to the other party's IP phone through the Internet.

In the Internet phone system of the present invention, the wireless Internet phone includes a personal computer, a personal digital assistant or a mobile phone.

In another embodiment, the present invention provides a wireless internet phone (Wi-Fiphone). The wireless network phone includes a wireless local area network module for establishing a first connection with a wireless local area network (wireless local area network, WLAN), and the wireless local area network module further includes a received signal strength indicator (received signal strength indicator (RSSI), used to display a signal strength of the first connection, and the wireless local area network is further coupled to an Internet (Internet). The wireless network phone also includes a general packet radio service network module for establishing a second connection with a general packet radio service (GPRS) network, and the general packet radio service network is further coupled to the the Internet. Wherein the wireless network phone uses voice over internet protocol (VoIP) technology to establish a conversation set (conversations session) between the wireless network phone and an other party's network phone coupled to the Internet to transfer a plurality of data packets exchanged Whether the path is through the first connection or the second connection, when the signal strength is greater than a preset threshold, select the first connection with low signal penetration capability as a data packet transmission path of the session set ; and when the signal strength is less than the preset threshold, selecting the second connection with high signal penetration capability as the data packet transmission path of the session set.

In the wireless IP phone of the present invention, the second connection is kept in a continuous online state during the progress of the session set.

The above and other objects, features, and advantages of the present invention will be apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic structural diagram of a VoIP system according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the software structure of the wireless network phone in Fig. 1;

Fig. 3 is a method for dynamically controlling the delivery path of data packets of a wireless network phone according to an embodiment of the present invention;

FIG. 4 is an Internet Protocol routing table (IP routing table) according to an embodiment of the present invention.

Detailed ways

Referring to FIG. 1 , it is a schematic structural diagram of a network telephone system according to an embodiment of the present invention. The wireless network phone 100 includes two modules for communication: a wireless local area network (wireless local area network, WLAN) module 102 and a GPRS module 104 . In this embodiment of the present invention, the wireless local area network module used is a Wi-Fi module, but the wireless local area network module of the present invention is not limited thereto, but can be other wireless networks that meet IEEE 802.11 series or IEEE 802.16 series standards LAN module

The wireless LAN phone 100 can connect to the wireless local area network 106 by means of the WLAN module 102 , and the wireless LAN phone 100 can also connect to the GPRS network 108 through the GPRS module 104 . Both the WLAN 106 and the GPRS network 108 are connected to an Internet 110 . And a called party phone 120 can also be directly or indirectly connected to the Internet 110 . Therefore, the wireless IP phone 100 can connect to the wireless local area network 106 through the WLAN module 102 , and establish a connection with the other party's IP phone 120 through the Internet 110 , and exchange control or voice data packets for communication. Similarly, after the wireless network phone 100 is connected to the GPRS network 108 by means of the GPRS module 104 , it can establish a connection with another party's network phone 120 through the Internet 110 and exchange control or voice data packets for conversation.

In addition, the wireless local area network 106 also includes a router (router) or gateway (gateway) 112, in order to control the transmission of all packets in the wireless local area network 106 according to the destination address (desination address) of the data packet, whether it is sent to A suitable router in the Internet 110 is used to transmit to the IP phone 120 of the other party, or to receive the packet from the IP phone 120 of the other party through the Internet 110 and transmit it to the WLAN module 102 of the wireless IP phone 100 . Similarly, a router or gateway 114 is also included in the GPRS network 108 to control the transmission of all packets in the GPRS network 108 according to the destination address of the data packet, whether it is sent to a suitable router in the Internet 110 for delivery to The other party's network phone 120 , or receive the packet from the other party's network phone 120 through the Internet 110 and send it to the GPRS module 104 of the wireless network phone 100 . The router 114 may be a GPRS gateway support node (Gateway GPRS support node, GGSN) in the GPRS network structure.

Referring to FIG. 2 , it is a schematic diagram of the software structure of the wireless network phone 100 in FIG. 1 . Wherein the software 200 is the main program of the wireless network phone 100, and the processor (processor) of the wireless network phone 100 executes the software 200 to control the relevant hardware units inside the wireless network phone 100 to realize the above-mentioned functions of the wireless network phone 100. The software 200 includes an operating system kernel (operation system kernel) 202 for managing and controlling all programs (program routines) that the software 200 needs to execute. Assume that the wireless IP phone 100 has established a session with the other party's IP phone 120 as shown in FIG. 1 . At this time, the wireless network phone 100 may use a microphone to capture the voice signal of the user of the phone, and the voice signal becomes a digital voice signal through sampling. Then, a digital signal processing module (DSP) may be used to compress the sound signal into different formats of speech compression data, which is commonly used in digital speech voice codec standards for human speech. ) includes G.711, G.722, G.723, G.728, G.729.

Next, the wireless IP phone 100 will convert the compressed voice data into voice packets in IP format according to the wireless IP phone protocol (such as H.323, SIP, MEGACO, etc.) adopted by the phone, so as to send them out via the network. Firstly, the operating system kernel 202 converts the voice compression data into a UDP format via a user datagram protocol (UDP) module 204 . Next, the voice compressed data in UDP format will be further converted into IP packets in Internet Protocol (IP) format via the Internet Protocol module 206 . The UDP module 204 and the IP module 206 respectively correspond to the layer 4 protocol and the layer 3 protocol of the TCP/IP communication protocol.

Then the operating system core 202 will determine which module to use to send the voice data packet according to the form of the communication network adopted by the wireless IP phone 100 . If the wireless IP phone 110 is using the WLAN 106 to communicate with another party's IP phone 120 , the voice data packet will be sent to the WLAN module 208 for processing. The WLAN module 208 can be a firmware controlling the WLAN chip 220 , so the voice data packets will be transmitted to the WLAN 106 through the WLAN chip 220 . If the wireless IP phone 110 is using the GPRS network 108 to communicate with another party's IP phone 120 , the voice data packet will be sent to the GPRS module 210 for processing. The GPRS module 210 can be the firmware controlling the GPRS chip 230, so the voice data packet will be sent to the GPRS network 108 through the GPRS chip 220.

Similarly, if the IP phone 120 of the other party transmits the voice data packet to the wireless IP phone 100 through the network, the processing method of the voice data packet depends on the form of the communication network currently adopted by the wireless IP phone 100 . If the wireless network phone 110 is using the wireless local area network 106 to communicate with the other party's network phone 120, the voice data packet will be sent to the WLAN chip 220, and will be processed by the firmware WLAN module 208 controlling the WLAN chip 220, so that the voice data The packet is restored to the format of an IP packet. If the wireless network phone 110 is using the GPRS network 108 to communicate with the other party's network phone 120, the voice data packet will be sent to the GPRS chip 230, and will be processed by the firmware GPRS module 210 controlling the GPRS chip 230, so that the voice data The packets are restored to the format of Internet Protocol (IP) packets. The restored IP packet will be sent to the IP module 206 to remove the format of the Internet protocol; and further sent to the UDP module 204 to remove the format of the UDP, and restore the compressed voice data in the packet. The voice compressed data can be decompressed by DSP according to its digital voice compression standard, and then converted into an analog signal through digital-to-analog conversion, and transmitted to the phone user through the speaker of the wireless network phone 100 .

FIG. 3 is a method 300 for dynamically controlling the delivery path of a data packet of a wireless network phone according to an embodiment of the present invention. The method 300 is executed by the software 200 in FIG. 2 , which directs the data packets of the wireless network phone 100 to be transmitted on the wireless local area network (WLAN) 106 or the general packet radio service (GPRS) network 108. Therefore, the method 300 is not Unbalanced traffic control method. Since the form of the wireless Internet phone is not limited to the Internet phone (IPphone), it can be an Internet phone executed on a personal computer (PC) and a personal digital assistant (PDA), and there is also a mobile phone (mobile phone) with a wireless local area network function. Therefore, the form of the wireless network phone 100 may include a personal computer, a personal digital assistant, a mobile phone and other forms of terminal devices. Similarly, the network phone 120 of the other party can also be a personal computer, a personal digital assistant, a mobile phone or other types of terminal devices. In addition, the steps of the method 300 are described based on the case where the user actively dials out to the receiving party, but the implementation of the method 300 is not limited to the case of the calling party actively dialing out, and the same concept can also be applied to The situation where the user acts as the called party to receive calls from other parties.

After step 302 starts, step 304 is performed first, that is, the user dials a wireless network phone 100 in order to talk with the receiver of the other party's network phone 120, and the wireless network phone 100 has a wireless local area network (WLAN) module 102 at the same time and a GPRS module 104 . Next, step 306 uses the WLAN module 102 to establish a connection with the phone 120 of the other party's network through the wireless local area network 106, and designates the WLAN module 102 as the default module of the phone. Next, in step 308, after the WLAN module 102 is started, the general packet radio service (GPRS) module 104 is started immediately, and remains in the always on state. The so-called continuous online state refers to that the GPRS module 104 and the GPRS network 108 remain in a connected state. In this continuous online state, the GPRS module 104 and the GPRS network 108 only exchange a small number of packets to maintain the connection, and since most GPRS system operators are billed by the amount of transmitted data, it will not cause too much trouble to remain in the continuous online state. Many additional charges. In addition, in steps 306 and 308, the WLAN module 102 and the GPRS module 104 respectively obtain independent IP addresses (IP addresses) in the WLAN 106 and the GPRS network 108 for communication.

Next, in step 310, the software 200 can specify a packet transfer path according to the call preset module. At this time, the call preset module has been set as the WLAN module 102 in step 306, so the subsequent network packets transmitted between the wireless network phone 100 and the other party's network phone 120 will pass through the WLAN module 102 in order to realize the call. The wireless local area network 106 performs the transfer. Regarding the setting of the data packet routing, reference can be made to FIG. 4 , which is a set of IP routing table (IP routing table) 400 stored in the software 200 . The column 402 is the destination address (destination) of the packet, the column 404 is the address of the gateway (gateway), the column 406 is the network mask (mask), and the column 408 is the corresponding communication interface module. Line 410 corresponds to the GPRS network 108, assuming that the network address range of the GPRS network 108 is 10.1.1.x, and its netmask is 255.255.254.0, so if the destination address of the packet is 10.1.1.x and the netmask 255.255.254.0 It is 10.1.1.0 after carrying out the AND operation, then this packet is intended to be delivered to the GPRS network 108, and needs to be sent through the corresponding GPRS module 104. Row 412 corresponds to WLAN 106, assuming that the network address range of WLAN 106 is 10.1.2.x, and its netmask is 255.255.254.0, so if the destination address of the packet is 10.1.2.x and netmask 255.255 .254.0 is 10.1.2.0 after performing an AND operation, then the packet is intended to be transmitted to the WLAN network 106 and needs to be sent via the corresponding WLAN module 102 .

Line 414 is a preset route (default route), its netmask is 0.0.0.0, and the destination address of any packet is 0.0.0.0 after performing AND operation with this netmask 0.0.0.0, so any packet is sent via the default route. Therefore, if the preset route is WLAN 106 at this time, the gateway column 404 of line 414 needs to be set as the network address of gateway 112 in WLAN 106, assuming 10.1.2.254, and the communication interface module corresponding to line 414 Change to WLAN module 102 . Therefore, all packets will be sent to the WLAN 106 via the WLAN interface 102 for delivery by default. Similarly, if the preset route is the GPRS network 108 at this time, the gateway column 404 of the line 414 needs to be set as the network address of the gateway 114 in the GPRS network 108, assuming 10.1.1.254, and the communication interface module corresponding to the line 414 Change to GPRS module 104 . Therefore, all packets will be sent to the GPRS network 108 via the GPRS interface 104 by default for delivery.

At this time, the preset route of the data packet has been set, and the wireless IP phone 100 can communicate with the other party's IP phone 120 in step 311 . The voice and control signal data packets exchanged by the two parties during the call will be delivered via the preset route.

Next, in step 312 , it is determined whether to change the default communication module according to the strength of the received signal strength indicator (RSSI) detected by the WLAN module 102 . A preset threshold of RSSI can be set first, such as 33% or 60dB. If the RSSI is lower than the preset threshold, it means that the connection between the wireless local area network 106 and the WLAN module 102 is very weak, and it is easy to cause insufficient signal reliability and disconnection. Therefore, in step 316, the default module is set to GPRS Module 104. On the contrary, if the RSSI is higher than the preset threshold, it means that the connection strength between the WLAN 106 and the WLAN module 102 is sufficient to maintain signal reliability, so the default module is set to the WLAN module 102 in step 314 . Then return to step 310, specify the transfer path and preset route of the packet according to the call preset module, and execute step 314 to make a call. Finally, when the user hangs up the phone, the network call set between the wireless network phone 100 and the other party's network phone 120 is ended first. At this time, no matter what the current call preset module is, the connection between the WLAN 106 and the WLAN module 102 will be cut off, and the connection between the GPRS network 108 and the GPRS module 104 will be cut off.

Therefore, in the application of the wireless network phone, the present invention provides a method for dynamically controlling the routing of data packets of the wireless network phone, so that when the connection signal between the wireless network phone and WLAN is weak, the GPRS network can be used instead of the wireless network. The data packet transmission path of the phone to achieve the effect of GPRS and WLAN complementing each other. Therefore, the problem of insufficient signal reliability or even disconnection caused by the user of the wireless network phone in a mobile state can be avoided.

The above description is only a preferred embodiment of the present invention, but it is not intended to limit the scope of the present invention. Any person familiar with this technology can make further improvements on this basis without departing from the spirit and scope of the present invention. Improvements and changes, so the protection scope of the present invention should be defined by the claims of the present application.

A brief description of the symbols in the drawings is as follows:

100: wireless network phone;

102: a wireless local area network (WLAN) module;

104: a general packet radio service (GPRS) module;

106: wireless local area network (WLAN);

108: General Packet Radio Service (GPRS) network;

110: Internet (Internet);

120: other network phone;

112, 114: router or gateway;

200: software;

202: Operating system kernel (OS kernel)

204: User Datagram Protocol (UDP) module

206: Internet Protocol (IP) module

208: Wireless Local Area Network (WLAN) module

210: General Packet Radio Service (GPRS) module

220: Wireless Local Area Network (WLAN) chip

230: General Packet Radio Service (GPRS) chip

300: A method for dynamically controlling the transmission path of a data packet of a wireless Internet phone;

400: The Internet Protocol routing table (IP routing table) at the core of the operating system.

Claims (16)

1. A method for controlling the data packet transfer path, used for dynamically controlling the exchange of data packets between a wireless network phone and an other party's network phone, the method comprises the following steps: establishing a first connection between the wireless network phone and a wireless local area network; establishing a second connection between the wireless network phone and a general packet radio service network; establishing a session set between the wireless IP phone and the other party's IP phone via the first connection and the second connection by using Internet telephony technology; detecting a signal strength of the first connection; When the signal strength is greater than a preset threshold, selecting the first connection with low signal penetration capability as a data packet transmission path of the session set; and When the signal strength is less than the preset threshold, select the second connection with high signal penetration capability as the data packet transmission path of the session set. 2. The method according to claim 1, wherein the first connection and the second connection are connected to the other party's network phone via an Internet. 3. The method for controlling the transmission path of a data packet according to claim 1, wherein the second connection is kept in a continuous online state when the session set is in progress. 4. The method for controlling a data packet transmission path according to claim 1, wherein selecting the first connection as the transmission path comprises the following steps: obtaining an IP address of a gateway of the wireless local area network; setting the default routing network address of the data packet as the IP address; sending the data packet from the wireless network phone to the gateway; and The data packet is sent to the other party's IP phone via an Internet. 5. The method for controlling a data packet transfer path according to claim 1, wherein selecting the second connection as the transfer path comprises the following steps: obtaining an IP address of a gateway of the GPRS network; setting the default routing network address of the plurality of data packets as the IP address; sending the data packet from the wireless network phone to the gateway; and The data packet is sent to the other party's IP phone via an Internet. 6. The method for controlling the transmission path of data packets according to claim 1, wherein the signal strength is detected by using a received signal strength indicator. 7. The method according to claim 1, wherein the wireless local area network is a wireless local area network conforming to IEEE 802.11 series or IEEE802.16 series standards. 8. The method for controlling the transmission path of data packets according to claim 1, wherein the wireless network phone includes a personal computer, a personal digital assistant and/or a mobile phone. 9. A network telephone system, comprising: a wireless local area network coupled to an Internet; A GPRS network coupled to the Internet; an other party's IP phone, coupled to the Internet; and A wireless network phone, including: a wireless local area network module for establishing a first connection with the wireless local area network, and the wireless local area network module further includes a received signal strength indicator for displaying a signal strength of the first connection; and A GPRS network module, used to establish a second connection with the GPRS network; Wherein the wireless network phone uses VoIP technology to establish a session set between the wireless network phone and the other party's network phone, and when the signal strength is greater than a preset threshold, select the first connection with low signal penetration capability as a data packet transmission path of the session set; and when the signal strength is lower than the preset threshold, selecting the second connection with high signal penetration capability as the data packet transmission path of the session set. 10. The network telephone system according to claim 9, wherein the wireless local area network is a wireless local area network conforming to IEEE 802.11 series or 802.16 series standards. 11. The Internet telephony system according to claim 9, wherein the second connection is kept in a continuous online state during the session set. 12. The VoIP system according to claim 9, wherein when determining that the transfer path is via the first connection, the wireless IP phone can set the default routing network addresses of the plurality of data packets to the The network address of a gateway included in the wireless local area network, so as to send the plurality of data packets to the gateway via the wireless local area network module, and then transmit to the other party's network phone through the Internet. 13. The VoIP system according to claim 9, wherein when determining that the transfer path is via the second connection, the wireless IP phone can set the default routing network addresses of the plurality of data packets to the The network address of a gateway included in the GPRS network, so as to send the plurality of data packets to the gateway via the GPRS network module, and then transmit to the other party's network phone through the Internet. 14. The Internet phone system according to claim 9, wherein the wireless Internet phone includes a personal computer, a personal digital assistant or a mobile phone. 15. A wireless network phone, comprising: A wireless local area network module, used to establish a first connection with a wireless local area network, the wireless local area network module includes a received signal strength indicator, used to display a signal strength of the first connection, and the wireless local area network The network is further coupled to an Internet; and a GPRS network module for establishing a second connection with a GPRS network, and the GPRS network is further coupled to the Internet; Wherein the wireless network phone uses Internet phone technology to establish a session set between the wireless network phone and an Internet phone of another party coupled to the Internet, and when the signal strength is greater than a preset threshold, select a low-level signal penetration capability The first connection is used as a data packet transmission path of the session set; and when the signal strength is less than the preset threshold, the second connection with high signal penetration capability is selected as the data packet of the session set delivery path. 16. The wireless IP phone according to claim 15, wherein the second connection is kept in a persistent online state during the session set.

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