TWI880378B - Voice conference system and voice conference method - Google Patents

Abstract

A voice conference system and a voice conference method are provided. The method includes: a first-invitee-device uses a first-invitee-voice, a first-voice-coding-method associated with a first-network, an encryption-and-decryption-algorithm, and a first-key to obtain a first-encoded-and-encrypted-invitee-voice; an initiator-device uses the first-encoded-and-encrypted-invitee-voice, the encryption-and-decryption-algorithm, the first-key, and the first-voice-coding-method to obtain the first-invitee-voice; the initiator-device performs mixing on an initiator-voice to obtain a mixing-result; the initiator-device uses the mixing-result, the first-voice-coding-method, the encryption-and-decryption-algorithm, and the first-key to obtain an encoded-and-encrypted-mixed-result; and the first-invitee-device uses the encoded-and-encrypted-mixed-result, the encryption-and-decryption-algorithm and the first-key to obtain an encoded-mixed-result.

Description

Voice conferencing system and method

The present invention relates to a voice conferencing system and method.

Currently, most VoIP voice conferences are encrypted by the terminal device, and then decrypted, mixed and encrypted by the server in sequence. The server then transmits the voice to the terminal device for decryption and playback. This approach is prone to security issues. On the other hand, if a new member needs to be added to the voice conference, all terminal devices need to re-negotiate the key process, which is time-consuming and complicated.

The voice conference system of the present invention includes an initiator device, a server, and a plurality of invitee devices. The initiator device corresponds to the initiator voice. The server is communicatively connected to the initiator device. The plurality of invitee devices include a first invitee device, and the first invitee device is communicatively connected to the server via a first network, and the first invitee device corresponds to the first invitee voice, wherein when the initiator device and the first invitee device complete the voice conference registration process and the first key negotiation process, the first invitee device uses the first invitee voice, the first voice encoding method associated with the first network, the encryption and decryption algorithm, and the first key to obtain the first coded and encrypted invitee voice The initiator device obtains the first invitee voice by using the first coded and encrypted invitee voice, the encryption and decryption algorithm, the first key and the first voice encoding method; the initiator device performs mixing on the initiator voice to obtain a mixing result; the initiator device obtains the coded and encrypted mixed result by using the mixing result, the first voice encoding method, the encryption and decryption algorithm and the first key; the first invitee device obtains the coded mixed result by using the coded and encrypted mixed result, the encryption and decryption algorithm and the first key.

The voice conference method of the present invention is suitable for being executed by a voice conference system including an initiator device, a server and a plurality of invitee devices, wherein the initiator device corresponds to the initiator voice, wherein the plurality of invitee devices include a first invitee device, and the first invitee device is connected to the server via a first network communication, and the first invitee device corresponds to the first invitee voice, wherein the method comprises the following steps: when the initiator device and the first invitee device complete the voice conference registration process and the first key negotiation process, the first invitee device uses the first invitee voice, the first network associated with the first network, and the first key negotiation process to register the voice conference. The first coded and encrypted invitee voice is obtained by using a voice coding method, an encryption and decryption algorithm, and a first key; the initiator device obtains the first invitee voice using the first coded and encrypted invitee voice, an encryption and decryption algorithm, a first key, and the first voice coding method; the initiator device performs mixing on the initiator voice to obtain a mixing result; the initiator device obtains the coded and encrypted mixed result by using the mixing result, the first voice coding method, an encryption and decryption algorithm, and a first key; and the first invitee device obtains the coded mixed result by using the coded and encrypted mixed result, an encryption and decryption algorithm, and the first key.

FIG1 is a schematic diagram of a voice conferencing system according to an embodiment of the present invention. The voice conferencing system of the present invention may include an initiator device, a server, and multiple invitee devices. The server may be communicatively connected to the initiator device. Each of the multiple invitee devices may be communicatively connected to the server. In detail, the multiple invitee devices may include a first invitee device, and the first invitee device may be communicatively connected to the server via a first network. Further, the multiple invitee devices may include a second invitee device, and the second invitee device may be communicatively connected to the server via a second network. It should be noted that the number of invitee devices shown in FIG1 is for illustration only, and the present invention is not limited thereto.

The initiator device may include an initiator registration unit 111, an initiator recording unit 112, an initiator transceiver unit 113, an initiator decryption unit 114, an initiator encryption unit 115, and a mixing unit 116. The server may include a server-side registration unit 210 and a transfer unit 220. Each of the plurality of invitee devices may include an invitee registration unit 121, an invitee recording unit 122, an invitee transceiver unit 123, an invitee encryption unit 124, and an invitee decryption unit 125.

Each of the initiator device, the server, and the plurality of invitee devices may include a communication chip (not shown in the figure), a storage device (not shown in the figure), and a processing module (not shown in the figure).

FIG. 2 is a flow chart of a voice conference registration process and a key negotiation process according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 at the same time. For the sake of convenience, FIG. 2 only shows the process of the initiator device, the server, and the first invitee device executing the voice conference registration process and the key negotiation process. In this embodiment, the invitee registration unit 121 (of the first invitee device), the initiator registration unit 111, and the server-side registration unit 210 can execute the voice conference registration process.

Specifically, in step S201, the initiator registration unit 111 may transmit registration information to the server registration unit 210.

In step S202, the initiator registration unit 111 may receive a registration success notification corresponding to the above registration information from the server-side registration unit 210.

In step S203, the initiator register 111 may send a push notification to the invitee register 121 (of the first invitee's device) via the server register 210. Then, the invitee register 121 may ring to notify the first invitee.

In step S204 , the invitee registration unit 121 (of the first invitee device) may transmit the registration information to the server registration unit 210 .

In step S205, the invitee registration unit 121 (of the first invitee device) may receive a registration success notification corresponding to the registration information (in step S204) from the server-side registration unit 210.

In step S206, the invitee registration unit 121 (of the first invitee device) may receive the Invite message from the initiator registration unit 111 via the server registration unit 210. Then, the invitee registration unit 121 (of the first invitee device) may perform the work of connecting the voice conference function.

After executing the voice conference registration process of step S201 to step S206, the initiator device, the server and the first invitee device will continue to execute the key negotiation process. Specifically, in step S207, the initiator encryption unit 115 can transmit the key exchange request to the invitee encryption unit 124 (of the first invitee device) via the transfer unit 220.

In step S208, the invitee encryption unit 124 (of the first invitee device), the initiator encryption unit 115, and the transfer unit 220 may perform a first key negotiation process. Then, when the invitee encryption unit 124, the initiator encryption unit 115, and the transfer unit 220 of the first invitee device complete the first key negotiation process, the invitee encryption unit 124 of the first invitee device may obtain the first key, and the initiator encryption unit 115 may obtain the first key.

After executing the key negotiation process of step S207 to step S208, in step S209, the initiator device, the server and the first invitee device can start the voice conference. Specifically, the initiator transceiver unit 113 and the invitee transceiver unit 123 of the first invitee device can receive the packet and can decompose the packet based on the UDP/RTP transmission protocol to start the encrypted voice conference.

FIG. 3 is a flow chart of a voice conference according to an embodiment of the present invention. Please refer to FIG. 1, FIG. 2 and FIG. 3 at the same time. For the sake of explanation, FIG. 3 only shows the process of the initiator device, the server and the first invitee device performing the voice conference. In this example, the initiator device may correspond to the initiator voice. On the other hand, the first invitee device may correspond to the first invitee voice. When the initiator device and the first invitee device complete the voice conference registration process and the first key negotiation process, the first invitee device may use the first invitee voice, the first voice encoding method associated with the first network, the encryption and decryption algorithm and the first key to obtain the first coded and encrypted invitee voice. The following will continue to explain.

In step S301, the originator recording unit 112 may transmit the originator's voice to the mixing unit 116. Specifically, the originator recording unit 112 may record the originator's voice in the form of an analog signal from the originator, and convert the originator's voice in the form of an analog signal into the originator's voice in the form of a digital signal. Then, the originator recording unit 112 may transmit the originator's voice in the form of a digital signal to the mixing unit 116. On the other hand, the invitee recording unit 122 of the first invitee device may record the first invitee's voice from the first invitee, and convert the first invitee's voice in the form of an analog signal into the first invitee's voice in the form of a digital signal. Then, the invitee recording unit 122 of the first invitee device may select a first voice encoding method according to the first network environment of the first network. Then, the invitee recording unit 122 of the first invitee device may encode the first invitee voice using the first voice encoding method (associated with the first network) to obtain the first encoded invitee voice. After obtaining the first encoded invitee voice, the invitee recording unit 122 of the first invitee device may transmit the first encoded invitee voice to the invitee encryption unit 124 of the first invitee device.

In step S302, the invitee encryption unit 124 of the first invitee device may encrypt the first coded invitee voice using an encryption algorithm and a first key to obtain the first coded and encrypted invitee voice. Then, the invitee encryption unit 124 of the first invitee device may transmit the first coded and encrypted invitee voice to the invitee transceiver unit 123 of the first invitee device.

In step S303, the invitee transceiver unit 123 of the first invitee device may transmit the first coded and encrypted invitee voice to the initiator transceiver unit 113 via the forwarding unit 220. Specifically, the invitee transceiver unit 123 of the first invitee device may transmit the first coded and encrypted invitee voice to the forwarding unit 220 based on the UDP/RTP transmission protocol. Then, the forwarding unit 220 may transmit the first coded and encrypted invitee voice to the initiator transceiver unit 113 based on the UDP/RTP transmission protocol.

In step S304, the initiator transceiver unit 113 may obtain the first coded and encrypted invitee voice. Specifically, the initiator transceiver unit 113 may perform packet decomposition based on the UDP/RTP transmission protocol to obtain the first coded and encrypted invitee voice. Then, the initiator transceiver unit 113 may transmit the first coded and encrypted invitee voice to the initiator decryption unit 114.

In this embodiment, the initiator device can obtain the first invitee voice using the first coded and encrypted invitee voice, the encryption and decryption algorithm, the first key, and the first voice encoding method (used by the invitee recording unit 122 of the first invitee device in the aforementioned step S301). Then, the initiator device can perform mixing on the initiator voice to obtain a mixing result. Then, the initiator device can obtain the coded and encrypted mixing result using the mixing result, the first voice encoding method, the encryption and decryption algorithm, and the first key. The following will continue to explain.

In step S305, the initiator decryption unit 114 may use the encryption and decryption algorithm and the first key to decrypt the first coded and encrypted invitee voice to obtain the first coded invitee voice. Then, the initiator decryption unit 114 may transmit the first coded invitee voice to the mixing unit 116.

In step S306, the mixing unit 116 may decode the first coded invitee voice using the first voice coding method to obtain the first invitee voice. Then, the initiator device (the mixing unit 116) may mix the initiator voice to obtain a mixing result. Then, the mixing unit 116 may encode the mixing result using the first voice coding method (used by the invitee recording unit 122 of the first invitee device in the aforementioned step S301) to obtain an encoded mixing result. Then, the mixing unit 116 may transmit the encoded mixing result to the initiator encryption unit 115.

In step S307, the initiator encryption unit 115 may encrypt the coded mixing result using the encryption and decryption algorithm and the first key to obtain the coded and encrypted mixing result. Then, the initiator encryption unit 115 may transmit the coded and encrypted mixing result to the initiator transceiver unit 113.

In step S308, the initiator transceiver unit 113 may transmit the encoded and encrypted mixing result to the invitee transceiver unit 123 of the first invitee device via the transfer unit 220. Specifically, the initiator transceiver unit 113 may transmit the encoded and encrypted mixing result to the transfer unit 220 based on the UDP/RTP transmission protocol. Then, the transfer unit 220 may transmit the encoded and encrypted mixing result to the invitee transceiver unit 123 of the first invitee device based on the UDP/RTP transmission protocol.

In this embodiment, the first invitee device may obtain the encoded mixed audio result using the encoded and encrypted mixed audio result, the encryption and decryption algorithm, and the first key. In detail, in step S309, the invitee transceiver unit 123 of the first invitee device may perform packet decomposition based on the UDP/RTP transmission protocol to obtain the encoded and encrypted mixed audio result. Then, the invitee transceiver unit 123 of the first invitee device may transmit the encoded and encrypted mixed audio result to the invitee decryption unit 125 of the first invitee device. Then, the invitee decryption unit 125 of the first invitee device may obtain the encoded mixed audio result using the encoded and encrypted mixed audio result, the encryption and decryption algorithm, and the first key. Then, the invitee decryption unit 125 of the first invitee device may play the encoded mixed result.

In one embodiment, the encryption and decryption algorithm is the ECDH/DH algorithm, but the present invention is not limited thereto.

It should be noted that, as shown in FIG. 1 , since the multiple invitee devices include a first invitee device and a second invitee device, the initiator device, the server, and the first invitee device can use the method of FIG. 2 to perform the first voice conference registration process and the first key negotiation process. On the other hand, the initiator device, the server, and the second invitee device can also use a method similar to FIG. 2 to perform the second voice conference registration process and the second key negotiation process. Furthermore, the initiator device, the server, the first invitee device, and the second invitee device can use a method similar to FIG. 3 to perform a voice conference. In other words, the voice conference may include the initiator, the first invitee, and the second invitee.

Specifically, when the invitee encryption unit 124 of the first invitee device, the initiator encryption unit 115 and the transfer unit 220 complete the first key negotiation process (such as step S207 to step S208 in Figure 2), the invitee encryption unit 124 of the first invitee device can obtain the first key, and the initiator encryption unit 115 can obtain the first key. On the other hand, when the invitee encryption unit 124 of the second invitee device, the initiator encryption unit 115 and the transfer unit 220 complete the second key negotiation process (such as step S207 to step S208 in Figure 2), the invitee encryption unit 124 of the second invitee device can obtain the second key, and the initiator encryption unit 115 can obtain the second key.

Furthermore, the second invitee device may correspond to the second invitee voice. The mixing result may include a first mixing result and a second mixing result, wherein the encoded and encrypted mixing result may include a first encoded and encrypted mixing result and a second encoded and encrypted mixing result, wherein the encoded mixing result may include a first encoded mixing result and a second encoded mixing result. Further, similar to the above step S301, the invitee recording unit 122 of the second invitee device may select a second voice encoding method according to the second network environment of the second network. The following will be described.

Similar to the above steps S301 and S302, when the initiator device and the second invitee device complete the voice conference registration process, the second invitee device can use the second invitee voice, the second voice encoding method associated with the second network, the encryption and decryption algorithm and the second key to obtain the second coded and encrypted invitee voice.

Similar to the above-mentioned step S305 and step S306, the initiator device can obtain the second invitee's voice by using the second coded and encrypted invitee's voice, the encryption and decryption algorithm, the second key and the second voice encoding method.

Then, the initiator device may perform mixing on the initiator's voice and the first invitee's voice to obtain a first mixing result, and the initiator device may perform mixing on the initiator's voice and the second invitee's voice to obtain a second mixing result. Then, the initiator device may use the second mixing result, the first voice coding method, the encryption algorithm, and the first key to obtain a first coded and encrypted mixing result, and the initiator device may use the first mixing result, the second voice coding method, the encryption algorithm, and the second key to obtain a second coded and encrypted mixing result. Then, the first invitee device may obtain a first encoded mixed result using the first encoded and encrypted mixed result, the encryption and decryption algorithm, and the first key, and the second invitee device may obtain a second encoded mixed result using the second encoded and encrypted mixed result, the encryption and decryption algorithm, and the second key.

FIG. 4 is a schematic diagram of a key negotiation process and end-to-end encryption according to an embodiment of the present invention. Please refer to FIG. 1, FIG. 2, FIG. 3 and FIG. 4 simultaneously. In this embodiment, the plurality of invitee devices include a first invitee device, a second invitee device and a third invitee device. In the key negotiation process of this embodiment, the initiator encryption unit 115 and the invitee encryption unit 124 of each invitee device transmit negotiation information via the Internet instead of transmitting the key itself. Furthermore, only the initiator device and the specific invitee device participating in a specific key negotiation process can calculate the key.

Furthermore, the keys calculated by the initiator device and each invitee device are independent of each other. As shown in FIG. 4 , the key calculated by the initiator device and the first invitee device is the first key, the key calculated by the initiator device and the second invitee device is the second key, and the key calculated by the initiator device and the third invitee device is the third key. If a fourth invitee device is to be added during the encrypted voice conference, only the fourth invitee device needs to perform a key negotiation process with the initiator device to calculate the fourth key. In other words, the first invitee device, the second invitee device, and the third invitee device do not need to perform a key negotiation process again.

FIG. 5 is a schematic diagram of terminal mixing according to an embodiment of the present invention. Please refer to FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 at the same time. In this embodiment, the plurality of invitee devices include a first invitee device, a second invitee device and a third invitee device. The initiator device can decrypt, decode and mix each coded and encrypted invitee voice received from each invitee device. Specifically, as shown in FIG. 5, after the initiator device receives the first coded and encrypted invitee voice, the second coded and encrypted invitee voice and the third coded and encrypted invitee voice respectively, the initiator device can decrypt and decode the first coded and encrypted invitee voice, the second coded and encrypted invitee voice and the third coded and encrypted invitee voice respectively. Then, the initiator device can perform mixing. The first invitee device will receive the mixing result of the initiator's voice, the second invitee's voice, and the third invitee's voice. Furthermore, the second invitee device will receive the mixing result of the initiator's voice, the first invitee's voice, and the third invitee's voice. In addition, the third invitee device will receive the mixing result of the initiator's voice, the first invitee's voice, and the second invitee's voice.

If a fourth invitee device needs to be added during an encrypted voice conference, the initiator device only needs to decrypt and decode the fourth coded and encrypted invitee voice received from the fourth invitee device to obtain the fourth invitee voice, and then mix the fourth invitee voice with the (decrypted and decoded) first invitee voice, second invitee voice and third invitee voice respectively, and then send them to each invitee device respectively, without affecting the encrypted voice conference that has been carried out.

FIG6 is a schematic diagram of different voice coding methods in different network environments according to an embodiment of the present invention. Please refer to FIG1, FIG2, FIG3, FIG4, FIG5 and FIG6 at the same time. If the first invitee device in the first network (Wi-Fi network environment) selects the G.711 format as the first voice coding method, the initiator device will also encode the mixing result in the G.711 format and return it to the first invitee device. Furthermore, if the second invitee device in the second network (mobile network environment) selects the Opus format as the second voice coding method, the initiator device will also encode the mixing result in the Opus format and return it to the second invitee device. In addition, if the third invitee device in the third network (satellite network environment) selects the Lyra format as the third voice encoding method, the initiator device will also encode the mixing result in the Lyra format and return it to the third invitee device.

FIG7 is a schematic diagram of a cross-border encrypted voice conference scenario according to an embodiment of the present invention. Please refer to FIG1, FIG2, FIG3, FIG4, FIG5, FIG6 and FIG7 simultaneously. In an environment with a mobile network or a Wi-Fi network, the initiator using the initiator device (located at the Taiwan head office) can transmit registration information to the server-side registration unit 210 of the server via the initiator registration unit 111. The first invitee using the first invitee device (located at the US branch) can transmit registration information to the server-side registration unit 210 of the server via the invitee registration unit 121 of the first invitee device. Furthermore, the second invitee using the second invitee device (located at the Chinese branch) can transmit registration information to the server-side registration unit 210 of the server via the invitee registration unit 121 of the second invitee device. After completing the voice conference registration process and the key negotiation process, the initiator device, the first invitee device and the second invitee device can conduct a cross-border three-party encrypted voice conference.

The initiator, the first invitee and the second invitee can start talking to the initiator device, the first invitee device and the second invitee device respectively. The conversation content can be recorded by the initiator recording unit 112 of the initiator device, the invitee recording unit 122 of the first invitee device and the invitee recording unit 122 of the second invitee device respectively, wherein the first invitee's voice recorded by the first invitee device and the second invitee's voice recorded by the second invitee device will be encoded and encrypted according to the voice encoding method selected by them, and transferred to the initiator device through the server in the form of ciphertext. The initiator device will decrypt the audio through the initiator decryption unit 114 and send it to the mixing unit 116 for mixing with the first invitee device and the second invitee device respectively, and then encode it using the original voice encoding method. Finally, after encryption by the initiator encryption unit 115, the mixing result is sent to the invitee decryption unit 125 of the first invitee device and the invitee decryption unit 125 of the second invitee device in the form of ciphertext for decryption and playback respectively.

If a third invitee device wants to temporarily join the encrypted voice conference, after the third invitee device is successfully registered, it only needs to go through the key negotiation process with the initiator device to obtain the key. In other words, the first invitee device and the second invitee device already in the conference do not need to obtain the key again to continue the encrypted voice conference.

FIG8 is a schematic diagram of a voice conference scenario in a satellite network environment according to an embodiment of the present invention. The difference between this embodiment and FIG7 is that, since the location of the first invitee device in country B is in a war and may not be able to use a mobile network or Wi-Fi network, the first invitee can use a satellite phone to share the satellite network with the first invitee device. Based on this, the first invitee device can conduct an encrypted voice conference with the initiator device and the second invitee device that have a mobile network or Wi-Fi network.

FIG9 is a flow chart of a voice conference method according to an embodiment of the present invention, wherein the voice conference system method can be implemented by the voice conference system shown in FIG1. In step S910, when the initiator device and the first invitee device complete the voice conference registration process and the first key negotiation process, the first invitee device uses the first invitee voice, the first voice encoding method associated with the first network, the encryption and decryption algorithm, and the first key to obtain the first coded and encrypted invitee voice. In step S920, the initiator device uses the first coded and encrypted invitee voice, the encryption and decryption algorithm, the first key, and the first voice encoding method to obtain the first invitee voice. In step S930, the initiator device performs mixing on the initiator voice to obtain a mixing result. In step S940, the initiator device uses the mixing result, the first voice encoding method, the encryption and decryption algorithm, and the first key to obtain a coded and encrypted mixing result. In step S950, the first invitee device uses the coded and encrypted mixing result, the encryption and decryption algorithm, and the first key to obtain a coded mixing result. The method has been described in the above-mentioned embodiment and will not be repeated here.

In summary, the voice conferencing system and method of the present invention can use end-to-end encryption and terminal mixing to perform voice conferencing. When a new member is added to the voice conference, only the new member and the initiator device need to perform a key negotiation process. Furthermore, since the server does not need to perform decryption, mixing and encryption, the security of voice information can be improved. In addition, the invitee device can choose a suitable voice encoding method according to the network environment, which further improves the flexibility of the voice conference.

111: Originator registration unit 112: Originator recording unit 113: Originator receiving and sending unit 114: Originator decryption unit 115: Originator encryption unit 116: Mixing unit 121: Invitee registration unit 122: Invitee recording unit 123: Invitee receiving and sending unit 124: Invitee encryption unit 125: Invitee decryption unit 210: Server registration unit 220: Transfer unit S201~S209, S301~S309, S910~S950: Steps

FIG. 1 is a schematic diagram of a voice conference system according to an embodiment of the present invention. FIG. 2 is a flow chart of a voice conference registration process and a key negotiation process according to an embodiment of the present invention. FIG. 3 is a flow chart of a voice conference according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a key negotiation process and end-to-end encryption according to an embodiment of the present invention. FIG. 5 is a schematic diagram of terminal mixing according to an embodiment of the present invention. FIG. 6 is a schematic diagram of different voice encoding methods in different network environments according to an embodiment of the present invention. FIG. 7 is a schematic diagram of a cross-border encrypted voice conference scenario according to an embodiment of the present invention. FIG8 is a schematic diagram of a voice conferencing scenario in a satellite network environment according to an embodiment of the present invention. FIG9 is a flow chart of a voice conferencing method according to an embodiment of the present invention.

S910~S950: Steps

Claims (9)

A voice conference system includes: an initiator device corresponding to the initiator voice; a server communicatively connected to the initiator device; and a plurality of invitee devices, wherein the plurality of invitee devices include a first invitee device, and the first invitee device is communicatively connected to the server via a first network, and the first invitee device corresponds to the first invitee voice, wherein when the initiator device and the first invitee device complete the voice conference registration process and the first key negotiation process, the first invitee device uses the first invitee voice, the first voice encoding method associated with the first network, the encryption and decryption algorithm, and the first key to obtain the first coded and encrypted invitee voice ; The initiator device obtains the first invitee voice using the first coded and encrypted invitee voice, the encryption and decryption algorithm, the first key, and the first voice encoding method; the initiator device performs mixing on the initiator voice to obtain a mixing result; the initiator device obtains the coded and encrypted mixing result using the mixing result, the first voice encoding method, the encryption and decryption algorithm, and the first key; the first invitee device obtains the coded mixing result using the coded and encrypted mixing result, the encryption and decryption algorithm, and the first key, wherein the first invitee device selects the first voice encoding method according to the first network environment of the first network. A voice conference system as described in claim 1, wherein the plurality of invitee devices further include a second invitee device, and the second invitee device is connected to the server via a second network communication, and the second invitee device corresponds to a second invitee voice, wherein the mixing result includes a first mixing result and a second mixing result, wherein the encoded and encrypted mixing result includes a first encoded and encrypted mixing result and a second encoded and encrypted mixing result, wherein the encoded mixing result includes a first The initiator device and the second invitee device complete the voice conference registration process, wherein the second invitee device uses the second invitee voice, the second voice coding method associated with the second network, the encryption algorithm and the second key to obtain the second coded and encrypted invitee voice; the initiator device uses the second coded and encrypted invitee voice, the encryption algorithm, the second key and the second key to obtain the second coded and encrypted invitee voice. The initiator device mixes the initiator voice and the first invitee voice to obtain the first mixing result, and the initiator device mixes the initiator voice and the second invitee voice to obtain the second mixing result; the initiator device uses the second mixing result, the first voice encoding method, the encryption and decryption algorithm and the first key to obtain the first encoding and encrypted mixing result, and ... The initiator device uses the first mixing result, the second voice coding method, the encryption algorithm and the second key to obtain the second encoding and encrypted mixing result; the first invitee device uses the first encoding and encrypted mixing result, the encryption algorithm and the first key to obtain the first encoding and mixed result, and the second invitee device uses the second encoding and encrypted mixing result, the encryption algorithm and the second key to obtain the second encoding and mixed result. A voice conference system as described in claim 2, wherein each of the plurality of invitee devices includes an invitee recording unit, wherein the invitee recording unit of the second invitee device selects the second voice encoding method according to the second network environment of the second network. A voice conference system as described in claim 2, wherein each of the plurality of invitee devices includes an invitee encryption unit, and the initiator device includes an initiator encryption unit, and the server includes a transfer unit, wherein when the invitee encryption unit of the first invitee device, the initiator encryption unit, and the transfer unit complete the first key negotiation process, the invitee encryption unit of the first invitee device obtains the first key, and the initiator encryption unit obtains the first key; when the invitee encryption unit of the second invitee device, the initiator encryption unit, and the transfer unit complete the second key negotiation process, the invitee encryption unit of the second invitee device obtains the second key, and the initiator encryption unit obtains the second key. A voice conference system as described in claim 1, wherein each of the plurality of invitee devices comprises an invitee recording unit, an invitee encryption unit and an invitee decryption unit, wherein the invitee recording unit of the first invitee device uses the first voice encoding method to encode the first invitee voice to obtain the first encoded invitee voice; the invitee encryption unit of the first invitee device uses the encryption and decryption algorithm and the first key to encrypt the first encoded invitee voice to obtain the first encoded and encrypted invitee voice; the invitee decryption unit of the first invitee device uses the encoding and encryption mixed sound result, the encryption and decryption algorithm and the first key to obtain the encoded mixed sound result. The voice conference system as described in claim 1, wherein the initiator device includes an initiator decryption unit, a mixing unit and an initiator encryption unit, wherein the initiator decryption unit uses the encryption and decryption algorithm and the first key to decrypt the first coded and encrypted invitee voice to obtain the first coded invitee voice; the mixing unit uses the first voice encoding method to decode the first coded invitee voice to obtain the first invitee voice; the mixing unit uses the first voice encoding method to encode the mixing result to obtain the encoded mixing result; the initiator encryption unit uses the encryption and decryption algorithm and the first key to encrypt the coded mixing result to obtain the coded and encrypted mixing result. A voice conferencing system as described in claim 1, wherein the encryption and decryption algorithm is an ECDH/DH algorithm. A voice conference system as described in claim 1, wherein each of the multiple invitee devices includes an invitee registration unit, and the initiator device includes an initiator registration unit, and the server includes a server-side registration unit, wherein the invitee registration unit, the initiator registration unit, and the server-side registration unit execute the voice conference registration process. A voice conference method is suitable for being executed by a voice conference system including an initiator device, a server and a plurality of invitee devices, wherein the initiator device corresponds to the initiator voice, wherein the plurality of invitee devices include a first invitee device, and the first invitee device is connected to the server via a first network communication, and the first invitee device corresponds to the first invitee voice, wherein the method includes the following steps: when the initiator device and the first invitee device complete the voice conference registration process and the first key negotiation process, the first invitee device uses the first invitee voice, the first voice encoding method associated with the first network, the encryption and decryption algorithm and the first key to obtain the first coded and encrypted invitee voice ; the initiator device uses the first coded and encrypted invitee voice, the encryption and decryption algorithm, the first key and the first voice encoding method to obtain the first invitee voice; the initiator device performs mixing on the initiator voice to obtain a mixing result; the initiator device uses the mixing result, the first voice encoding method, the encryption and decryption algorithm and the first key to obtain the coded and encrypted mixing result; and the first invitee device uses the coded and encrypted mixing result, the encryption and decryption algorithm and the first key to obtain the coded mixing result, wherein the method further includes the following steps: the first invitee device selects the first voice encoding method according to the first network environment of the first network.

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