CN106549978B - Session mode switching method and proxy server - Google Patents

Session mode switching method and proxy server Download PDF

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Publication number
CN106549978B
CN106549978B CN201611178741.4A CN201611178741A CN106549978B CN 106549978 B CN106549978 B CN 106549978B CN 201611178741 A CN201611178741 A CN 201611178741A CN 106549978 B CN106549978 B CN 106549978B
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client
proxy server
central control
multimedia
channel
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CN106549978A (en
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冯贵来
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Neusoft Corp
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Neusoft Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/104—Peer-to-peer [P2P] networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H04L65/403—Arrangements for multi-party communication, e.g. for conferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/148—Migration or transfer of sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services

Abstract

The disclosure relates to a session mode switching method and a proxy server. A session in P2P mode between a first client and a second client, the method comprising: the proxy server receives an invitation request sent by the first client, wherein the invitation request comprises an identity of the first client, an identity of a third client and an identity of central control equipment; the proxy server controls the first client, the second client and the third client to be connected to the central control equipment, and respectively establishes a signaling channel and a multimedia channel to the central control equipment; and the proxy server selects a multimedia server, and the multimedia server is used for processing the multimedia data forwarded to the central control device by the first client, the second client and the third client through the multimedia channel. By the scheme, the switching from the P2P mode to the conference mode can be smoothly and quickly realized.

Description

Session mode switching method and proxy server
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a session mode switching method and a proxy server.
Background
With the development of communication technology, the application of instant communication technology is more and more extensive. In daily applications, a user can establish a session in the following two ways:
(1) the session participated by 2 users can adopt a point-to-point (English: Peer-to-Peer, abbreviated as P2P) technology to establish a P2P mode session. In this mode, a multimedia channel is established between two clients participating in a session, and multimedia data interaction is directly performed.
(2) A session in conference mode may be established by a session in which more than 2 users participate. In this mode, each client needs to establish a multimedia channel with a central Control Unit (MCU), transmit local multimedia data to the MCU, and forward the local multimedia data to the multimedia server for processing.
In the practical application process, there is a scene of switching from a 2-person conversation to a multi-person conversation, and how to quickly complete the switching of the conversation mode, that is, switching from the P2P mode to the conference mode, is a problem to be solved at present.
Disclosure of Invention
The purpose of the present disclosure is to provide a session mode switching method and a proxy server, which are used to smoothly and rapidly implement the switching from the P2P mode to the conference mode.
In order to achieve the above object, in a first aspect, the present disclosure provides a session mode switching method, where a session is conducted between a first client and a second client in a P2P mode, the method including:
the proxy server receives an invitation request sent by the first client, wherein the invitation request comprises an identity of the first client, an identity of a third client and an identity of central control equipment;
the proxy server controls the first client, the second client and the third client to be connected to the central control equipment, and respectively establishes a signaling channel and a multimedia channel to the central control equipment;
and the proxy server selects a multimedia server, and the multimedia server is used for processing the multimedia data forwarded to the central control device by the first client, the second client and the third client through the multimedia channel.
Optionally, the proxy server can communicate with the central control device, and the proxy server controls the first client, the second client, and the third client to connect to the central control device, including:
the proxy server controls and establishes a signaling channel and a multimedia channel from the third client to the proxy server;
and the proxy server reserves the signaling channels from the first client and the second client to the proxy server and controls the establishment of a multimedia channel from the first client to the proxy server and a multimedia channel from the second client to the proxy server.
Optionally, the method further comprises:
the proxy server controls to disconnect the multimedia channel between the first client and the second client.
Optionally, the method further comprises:
and when a session in a P2P mode is established between the first client and the second client, the proxy server selects the central control equipment.
Optionally, after the proxy server receives the invitation request sent by the first client, the method further includes:
and the proxy server respectively controls the first client and the second client to play pre-stored audio information.
Optionally, after the proxy server receives the invitation request sent by the first client, the method further includes:
the proxy server establishes a conference identifier and establishes a corresponding relation between the conference identifier and the central control equipment;
the proxy server receives a joining request sent by a fourth client, wherein the joining request comprises an identity identifier of the fourth client and the conference identifier;
and the proxy server controls the fourth client to be connected to the central control equipment according to the conference identifier and the corresponding relation, and establishes a signaling channel and a multimedia channel from the fourth client to the central control equipment.
In a second aspect, the present disclosure provides a proxy server, between a first client and a second client, a session in a P2P mode, the proxy server comprising:
a request receiving module, configured to receive an invitation request sent by the first client, where the invitation request includes an identity of the first client, an identity of a third client, and an identity of a central control device;
a channel establishing module, configured to control the first client, the second client, and the third client to connect to the central control device, and respectively establish a signaling channel and a multimedia channel to the central control device;
the first selecting module is used for selecting a multimedia server, and the multimedia server is used for processing multimedia data which is forwarded to the central control device by the first client, the second client and the third client through the multimedia channel.
Optionally, the proxy server is capable of communicating with the central control device,
the channel establishing module is used for controlling and establishing a signaling channel and a multimedia channel from the third client to the proxy server; and reserving signaling channels from the first client and the second client to the proxy server, and controlling to establish a multimedia channel from the first client to the proxy server and a multimedia channel from the second client to the proxy server.
Optionally, the proxy server further includes:
and the channel disconnection module is used for controlling the disconnection of the multimedia channel between the first client and the second client.
Optionally, the proxy server further includes:
a second selecting module, configured to select the central control device when a session in a P2P mode is established between the first client and the second client.
Optionally, the proxy server further includes:
and the audio control module is used for respectively controlling the first client and the second client to play pre-stored audio information after receiving the invitation request sent by the first client.
Optionally, the proxy server further includes:
the conference identifier creating module is used for creating a conference identifier after receiving an invitation request sent by the first client and establishing a corresponding relation between the conference identifier and the central control equipment;
a join request receiving module, configured to receive a join request sent by a fourth client, where the join request includes an identity of the fourth client and the conference identifier;
and the connection control module is used for controlling the fourth client to be connected to the central control equipment according to the conference identifier and the corresponding relation, and establishing a signaling channel and a multimedia channel from the fourth client to the central control equipment.
When the session mode is switched, the following distinguishing processing can be carried out on the client: (1) for session participants in the P2P mode, a signaling channel between each client and the proxy server can be reserved, and simultaneously, a multimedia channel between the first client and the proxy server and a multimedia channel between the second client and the proxy server can be established; (2) for the newly joined third client, a signaling channel and a multimedia channel between the third client and the proxy server may be established. Therefore, the proxy server can forward the signaling sent by the client through the signaling channel to the MCU for processing; and forwarding the local multimedia data sent by the client through the multimedia channel to a multimedia server for processing through the MCU, and switching the session into a conference mode. By the scheme, the switching from the P2P mode to the conference mode can be smoothly and quickly realized.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic flow chart of a session mode switching method embodiment 1 according to the present disclosure;
FIG. 2 is a schematic diagram illustrating the interaction process between clients in P2P mode in the present disclosure;
FIG. 3 is a schematic diagram illustrating an interaction process between clients in a conference mode according to the present disclosure;
fig. 4 is a flowchart illustrating a session mode switching method according to embodiment 2 of the present disclosure;
fig. 5 is a schematic structural diagram of a proxy server according to the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Referring to fig. 1, a flowchart of a session mode switching method embodiment 1 of the present disclosure is shown. The session between the first client and the second client is in P2P mode, and the session mode can be switched according to the method shown in fig. 1, where the method includes the following steps:
step 101, the proxy server receives an invitation request sent by the first client, where the invitation request includes the identity of the first client, the identity of the third client, and the identity of the central control device.
The scheme of the disclosure is suitable for application scenarios in which the session is switched from the P2P mode to the conference mode.
Referring to fig. 2, the interaction process between clients in P2P mode is shown. The first client C1 and the second client C2 may establish P2P communication in the following manner.
1. Taking the example of the C1 request to establish a session with C2, C1 may send a connection request to the proxy server proxy, which may carry the following information: identity of C1, identity of C2. As an example, the identity of the client may be embodied as an IP address of a local area network where the client is located and a public network IP address.
2. The proxy server receives the connection request, and can select a central control unit (MCU) for the connection according to a load balancing principle. Taking fig. 2 as an example, the central control device cluster includes 3 MCUs, and the proxy server may allocate the MCU2 to the connection. That is, signaling exchanged between C1 and C2 may be routed through the proxy server to the MCU2 for processing. As an example, the load balancing principle may be embodied as: the selection is performed according to the idle degree of the MCU, and/or according to the length of the routing path between the proxy server and the MCU, which is not specifically limited by the present disclosure.
3. The proxy server sends an access request to C2, which may carry the following information: identity of C1, identity of C2, identity of MCU 2.
Thus, a multimedia channel, i.e., the data channel shown in FIG. 2, can be established between C1 and C2, and multimedia data such as audio, video, etc. can be interacted through the multimedia channel. In addition, C1 and C2 also establish signaling channels, i.e., signal channels shown in fig. 2, with the proxy server, respectively, for signaling transmission. As an example, the data channel may use UDP (user Datagram Protocol, Chinese) for data interaction, and the signal channel may use TCP (Transmission Control Protocol, Chinese) for signaling interaction.
In the practical application process, considering that the conference system needs to maintain a large amount of conference related information, and the conference related information cannot be shared between different MCUs, the scheme of the present disclosure needs to connect C1 and C2 to the same MCU in the cluster mode. Correspondingly, a FLAG field may be added to the signaling transmitted by C1 and C2 to specify the MCU to which the client is finally routed through the proxy server. In the example shown in fig. 2, the FLAG field may carry an identity of MCU2, so that the proxy server may route the signaling of C1 and/or C2 to MCU2 for processing.
When a session mode switch is required, i.e. a session participant in P2P mode requests to pull a third client to join the session, for example, C1 invites C3 to join the session, which may trigger the proxy server to switch from P2P mode to conference mode. Specifically, C1 may send an invite request to the proxy server, which may carry the following information: identity of C1, identity of C3, identity of MCU 2.
And 102, the proxy server controls the first client, the second client and the third client to be connected to the central control equipment, and respectively establishes a signaling channel and a multimedia channel to the central control equipment.
Step 103, the proxy server selects a multimedia server, and the multimedia server is configured to process multimedia data forwarded to the central control device by the first client, the second client, and the third client through the multimedia channel.
The proxy server receives the invite request sent by C1, and is triggered to perform the following two actions:
1. and establishing a signaling channel and a multimedia channel.
In the scheme of the disclosure, in the conference mode, a signaling channel and a multimedia channel from each client to the MCU can be established respectively. Considering that the proxy server is able to communicate with the MCU, a signaling channel and a multimedia channel may be established for each client to the proxy server, and then signaling and/or multimedia data is routed by the proxy server to the MCU.
For the invited client, the proxy server may control the establishment of a signaling channel and a multimedia channel from the third client to the proxy server. Specifically, after receiving the invite request, the proxy server may send an access request to C3, where the access request may carry the following information: identity of C1, identity of C3, identity of MCU 2. Thus, C3 can establish a signaling channel and a multimedia channel with the proxy server.
For the session participants (i.e., the first client and the second client) in P2P mode, the proxy server may reserve the signaling channels from the first client and the second client to the proxy server, and may also control the establishment of the multimedia channel from the first client to the proxy server and the multimedia channel from the second client to the proxy server. Specifically, considering that the signaling channel between the proxy server and C1 and the signaling channel between the proxy server and C2 have already been established in the P2P mode, the signaling channels may be kept unchanged when the session mode switching is performed. Meanwhile, a multimedia channel between the proxy server and C1, and a multimedia channel between the proxy server and C2 may also be established.
As introduced above, to ensure that all session participants in the conference mode are connected to the same MCU, the signaling of C1 and/or C2 and/or C3 may be routed by the proxy server to MCU2 for processing via the identity of the MCU carried in the FLAG field in the signaling transmitted by each client.
It is understood that, when the session mode is switched, the proxy server may also control to disconnect the multimedia channel between the first client and the second client. Specifically, the proxy server may first establish multimedia channels from C1 and C2 to the proxy server, respectively, and then disconnect the multimedia channel between C1 and C2; alternatively, the multimedia channel between C1 and C2 may be disconnected first, and then the multimedia channels from C1 and C2 to the proxy server may be established, respectively; alternatively, the two actions may be performed in parallel, which may not be specifically limited by the present disclosure.
As an example, after receiving the invitation request sent by the first client, the proxy server may further control the first client and the second client to play the pre-stored audio information, respectively. That is, there may be a click-through situation when switching from the P2P mode to the conference mode, and in order to improve the user experience, the pre-stored audio information may be played to the client user when switching the mode, for example, "access other user, please wait a bit" may be played.
As an example, it may be determined whether the card pause time length exceeds a preset time length, and if the card pause time length exceeds the preset time length, the pre-stored audio information is played. Or, considering that the card pause duration is usually relatively long when the user accesses the international conference, it may be determined whether the international conference is the conference by identifying the identity of the conference participant, and play the pre-stored audio information when the international conference is determined.
2. And selecting a multimedia server.
The proxy server may select a multimedia server for the mode switching from a multimedia server cluster according to a load balancing principle.
In the interaction process among the clients in the conference mode shown in fig. 3, C1, C2, and C3 may respectively collect local multimedia data, and transmit the collected multimedia data to the proxy server through the data channel, and then the proxy server routes the three paths of multimedia data to the MCU2, and the MCU2 forwards the three paths of multimedia data to the multimedia server for aggregation processing. After such processing, the multimedia server can forward the processed multimedia data to each client through the MCU 2.
As an example, the proxy server may establish a signaling channel and a multimedia channel, and then select the multimedia server; or, the multimedia server can be selected first, and then the signaling channel and the multimedia channel are established; alternatively, the two actions may be performed in parallel, which may not be specifically limited by the present disclosure.
In summary, when the session mode is switched, the present disclosure may disconnect the multimedia channel between the first client and the second client in the P2P mode, and respectively establish new multimedia channels between the first client and the proxy server and between the second client and the proxy server; meanwhile, a signaling channel and a multimedia channel between a newly added third client and the proxy server can be established, so that two channels are established between the proxy server and each client in the conference mode: a signaling channel and a multimedia channel. After the processing, the proxy server can receive the signaling sent by each client through the signaling channel and transmit the signaling to the MCU for processing; and the proxy server can receive local multimedia data collected by each client through the multimedia channel and forwards the local multimedia data to the multimedia server for processing through the MCU. Therefore, the switching from the P2P mode to the conference mode can be smoothly and quickly realized.
As an example, the scheme disclosed by the invention can be applied to voice/video chat scenes in the field of instant messaging such as WeChat and QQ, and is switched from double-person chat to multi-person chat; alternatively, the scheme disclosed by the invention can be applied to a video teaching scene, and the one-to-one teaching is switched to multi-person teaching. The specific application scenario of the present disclosure may not be limited, and the present disclosure relates to switching from the P2P mode to the conference mode, that is, the present disclosure may be adopted to perform the switching process.
Referring to fig. 4, a flowchart of a session mode switching method embodiment 2 of the present disclosure is shown. After the proxy server receives the invitation request sent by the first client, the method may further include:
step 201, the proxy server creates a conference identifier and establishes a corresponding relationship between the conference identifier and the central control device.
Step 202, the proxy server receives a join request sent by a fourth client, where the join request includes an identity of the fourth client and the conference identifier.
Step 203, the proxy server controls the fourth client to connect to the central control device according to the conference identifier and the corresponding relationship, and establishes a signaling channel and a multimedia channel from the fourth client to the central control device.
In view of the fact that more users may join the conference in the conference mode, the proxy server may also create a conference identifier for the switched conference mode after receiving the invitation request sent by the first client, and locally store a correspondence between the conference identifier and the identity of the MCU to which the session participant is connected. Thus, after the meeting identifier is provided to other client users, other clients can join the meeting using the meeting identifier. For example, the join request sent by the fourth client C4 to the proxy server may carry the following information: identity of C4, conference identity. Correspondingly, the proxy server may control to establish a signaling channel and a multimedia channel between the C4 and the proxy server, and at the same time, may determine an MCU accessed by the C4 according to the conference identifier, and forward the signaling and/or multimedia data sent by the C4 to the MCU corresponding to the conference identifier for processing. Therefore, the active joining of the client can be realized.
Referring to fig. 5, a schematic diagram of a proxy server according to the present disclosure is shown. The session between the first client and the second client is in a P2P mode, and the proxy server may include:
a request receiving module 301, configured to receive an invitation request sent by the first client, where the invitation request includes an identity of the first client, an identity of a third client, and an identity of a central control device;
a channel establishing module 302, configured to control the first client, the second client, and the third client to connect to the central control device, and respectively establish a signaling channel and a multimedia channel to the central control device;
a first selecting module 303, configured to select a multimedia server, where the multimedia server is configured to process multimedia data forwarded to the central control device by the first client, the second client, and the third client through the multimedia channel.
Optionally, the proxy server is capable of communicating with the central control device,
the channel establishing module is used for controlling and establishing a signaling channel and a multimedia channel from the third client to the proxy server; and reserving signaling channels from the first client and the second client to the proxy server, and controlling to establish a multimedia channel from the first client to the proxy server and a multimedia channel from the second client to the proxy server.
Optionally, the proxy server further includes:
and the channel disconnection module is used for controlling the disconnection of the multimedia channel between the first client and the second client.
Optionally, the proxy server further includes:
a second selecting module, configured to select the central control device when a session in a P2P mode is established between the first client and the second client.
Optionally, the proxy server further includes:
and the audio control module is used for respectively controlling the first client and the second client to play pre-stored audio information after receiving the invitation request sent by the first client.
Optionally, the proxy server further includes:
the conference identifier creating module is used for creating a conference identifier after receiving an invitation request sent by the first client and establishing a corresponding relation between the conference identifier and the central control equipment;
a join request receiving module, configured to receive a join request sent by a fourth client, where the join request includes an identity of the fourth client and the conference identifier;
and the connection control module is used for controlling the fourth client to be connected to the central control equipment according to the conference identifier and the corresponding relation, and establishing a signaling channel and a multimedia channel from the fourth client to the central control equipment.
With regard to the proxy server in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment related to the method, and will not be elaborated here.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A session mode switching method, wherein a session is conducted between a first client and a second client in a P2P mode, the method comprising:
the method comprises the steps that a proxy server receives an invitation request sent by a first client, wherein the invitation request comprises an identity of the first client, an identity of a third client and an identity of a central control device, and the central control device is determined by the proxy server from a central control device cluster according to a load balancing principle;
the proxy server controls the first client, the second client and the third client to be connected to the central control equipment, and respectively establishes a signaling channel and a multimedia channel to the central control equipment;
the proxy server selects a multimedia server, and the multimedia server is used for processing multimedia data forwarded to the central control device by the first client, the second client and the third client through the multimedia channel;
wherein the proxy server is capable of communicating with the central control device, the proxy server controlling the first client, the second client and the third client to connect to the central control device, comprising:
the proxy server controls and establishes a signaling channel and a multimedia channel from the third client to the proxy server;
and the proxy server reserves the signaling channels from the first client and the second client to the proxy server and controls the establishment of a multimedia channel from the first client to the proxy server and a multimedia channel from the second client to the proxy server.
2. The method of claim 1, further comprising:
the proxy server controls to disconnect the multimedia channel between the first client and the second client.
3. The method of claim 1, further comprising:
and when a session in a P2P mode is established between the first client and the second client, the proxy server selects the central control equipment.
4. The method according to any one of claims 1 to 3, wherein after the proxy server receives the invitation request sent by the first client, the method further comprises:
and the proxy server respectively controls the first client and the second client to play pre-stored audio information.
5. The method according to any one of claims 1 to 3, wherein after the proxy server receives the invitation request sent by the first client, the method further comprises:
the proxy server establishes a conference identifier and establishes a corresponding relation between the conference identifier and the central control equipment;
the proxy server receives a joining request sent by a fourth client, wherein the joining request comprises an identity identifier of the fourth client and the conference identifier;
and the proxy server controls the fourth client to be connected to the central control equipment according to the conference identifier and the corresponding relation, and establishes a signaling channel and a multimedia channel from the fourth client to the central control equipment.
6. A proxy server, wherein a session between a first client and a second client is conducted in a P2P mode, the proxy server comprising:
a request receiving module, configured to receive an invitation request sent by the first client, where the invitation request includes an identity of the first client, an identity of a third client, and an identity of a central control device, and the central control device is determined by the proxy server from a central control device cluster according to a load balancing principle;
a channel establishing module, configured to control the first client, the second client, and the third client to connect to the central control device, and respectively establish a signaling channel and a multimedia channel to the central control device;
the first selecting module is used for selecting a multimedia server, and the multimedia server is used for processing multimedia data forwarded to the central control device by the first client, the second client and the third client through the multimedia channel;
wherein the proxy server is capable of communicating with the central control device,
the channel establishing module is used for controlling and establishing a signaling channel and a multimedia channel from the third client to the proxy server; and reserving signaling channels from the first client and the second client to the proxy server, and controlling to establish a multimedia channel from the first client to the proxy server and a multimedia channel from the second client to the proxy server.
7. The proxy server of claim 6, further comprising:
and the channel disconnection module is used for controlling the disconnection of the multimedia channel between the first client and the second client.
8. The proxy server of claim 6, further comprising:
a second selecting module, configured to select the central control device when a session in a P2P mode is established between the first client and the second client.
9. The proxy server according to any of claims 6 to 8, characterized in that the proxy server further comprises:
and the audio control module is used for respectively controlling the first client and the second client to play pre-stored audio information after receiving the invitation request sent by the first client.
10. The proxy server according to any of claims 6 to 8, characterized in that the proxy server further comprises:
the conference identifier creating module is used for creating a conference identifier after receiving an invitation request sent by the first client and establishing a corresponding relation between the conference identifier and the central control equipment;
a join request receiving module, configured to receive a join request sent by a fourth client, where the join request includes an identity of the fourth client and the conference identifier;
and the connection control module is used for controlling the fourth client to be connected to the central control equipment according to the conference identifier and the corresponding relation, and establishing a signaling channel and a multimedia channel from the fourth client to the central control equipment.
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