The IMS (IP Multimedia Subsystem) is an IP Multimedia Subsystem, originally defined by 3GPP as a mobile network. Under the framework of NGN, IMS is extended to a converged network that supports both fixed access and mobile access. The core feature of the IMS network is the use of the SIP protocol and its independence from access: the SIP-based IMS framework relies on maximizing the reuse of Internet technologies and protocols, inheriting the unique network technologies of cellular mobile communications systems, and making full use of softswitch network technologies to make them. It can provide carrier-class QoS guarantee, effective and flexible billing for services, and has the powerful ability to integrate various types of network integrated services; access independence allows operators to change the existing network structure without input Easily develop new services and apply upgrades under any equipment cost conditions.
At present, IMS is considered to be the core technology of next-generation networks, and it is also an important way to solve the convergence of mobile and fixed networks and introduce differentiated services such as triple integration of voice, data, and video. Its introduction has laid a foundation for the network operators to provide new multimedia services, in which the converged video conferencing is one of the main applications of the IMS network.
Defects in existing video conferences Looking at the current video conferencing products provided by telecom operators or some equipment manufacturers and Internet application providers to users, the two types are basically divided into the following two types.
1) Hardware-based video conferencing This type of conference mainly uses H. 323 architecture, the overall architecture consists of terminals, gatekeepers, gateways, and multipoint control units (MCUs). The terminal is referred to as H. 323 terminal.
In H. In the videoconferencing architecture of 323, users use the terminal to register, configure, and initiate conferences through the gatekeeper pair H. The 323 terminal performs call control and bandwidth control. Finally, the control of the conference is achieved by mixing and switching the MCU network element audio and video. The gateway is responsible for completing H. 323 Terminal interoperates with other terminals.
Based on H. The 323-based video conferencing is a relatively early video conferencing system based on IP networks. It has special significance from the standpoint of replacing narrow-band conference systems. But during long-term use, H. The defects of 323 videoconferencing products are gradually exposed and are no longer suitable for future business development needs.
Defect 1: The operation is complicated and the threshold is high. The conference management and operation of the 323 video conference are very complex. Before the conference is held, the terminal needs to go through a complicated registration and configuration process before initiating the conference. In the process of the conference, the control of the conference site also needs special personnel to operate. The result of this is the use of H. Users of 323 videoconferencing systems often need professional conference management personnel, and some small and medium-sized enterprises often stop there.
Defect 2: The coverage of the terminal is narrow and the conference place is fixed with H. The 323 videoconferencing endpoint is limited to H. 323 terminal, the user's selectivity to the terminal device is very low, and H. The 323 protocol has special requirements on the IP port, which limits the use of LAN users and directly results in many customers abandoning the use of the service. At the same time, due to interoperability reasons, different H. The 323 video conference system also has different requirements for the terminal. For example, the “New Vision†system of China Telecom requires the terminal to comply with the registration mechanism of New Vision, further limiting the selection range of the user conference terminal.
In addition, H. 323 Video conferences all use specific conference terminals. They must be installed in conference rooms with fixed positions. Users must initiate conferences and participate in conferences to the designated conference rooms, which reduces the convenience of video conferences.
Defect 3: The degree of integration is not enough, facing a single customer group H. 323 video conferences only allow H. 323 terminal access, video conferencing only, integration in the convergence of the terminal, meeting methods, etc. is not enough. Moreover, due to the restrictions of various thresholds, this type of conference is currently only targeted at mid-to-high-end government and enterprise customers, and the customer base tends to be monotonous. This corresponds to a large number of small and medium-sized enterprises that have strong demand for video conferencing due to various factors such as enterprise costs. There is a strong contrast between the two.
2) Software-based videoconferencing These types of conferences are a kind of videoconferencing mode that has emerged quietly in recent years, including client mode and Web mode. A service provider providing this type of conference can establish a video conference server on the Internet, allowing the user to hold a conference through a specific client software or through a designated portal page. The majority of the user's identity authentication and routing are achieved by registering an account.
This type of meeting has greatly improved the ease of use and reduction of the usage threshold. However, since the protocols used are different, and even many software-based video conferencing systems use proprietary protocols, there is a big problem in terms of interoperability. Only the users of the system are allowed to hold conferences. Therefore, the coverage of users is limited.
Future business tends to be open and integrated. Analyze current market and user needs. Future video conferences need to meet the following functional requirements:
The access requirements of different types of users should be met so that users can access the conference immediately, and the cost of using the conference by the user can be minimized.
Easy to use, support users to use the Web browser to make reservations, control, account management, and cost inquiries;
The system is open and interface standards meet the requirements of globalization and cross-domain operations.
Combining the needs of the above three aspects, the future video conferencing system should be developed in the direction of openness, convergence, simplicity, and diversity, making video conferencing products a truly effective and flexible communication tool for users in their daily work and life.
â— Openness: The video conference system should adopt the international standard communication protocol. The service platform should be loosely coupled with the core network, access network, and terminal. It can implement interoperability between devices at different levels and ensure the flexibility of the networking. .
â— Convergence: In addition to supporting videoconferencing, the system should also support audio conferences and data conferences to meet the needs of users at different levels. The coexistence of multiple media formats is allowed in the same venue, and the system adapts to different media formats.
◠Simplicity: Provides web-based portal portals to create conferences, manage venues, and provide a simple, “fool-style†interface that simplifies user operations. As long as broadband is accessible, users can access the portal portal to create conferences and manipulate conferences.
â— Diversity: The diversity here is mainly reflected in the following three aspects.
Terminal diversity. The implementation of the terminal type is not limited from the architecture, including PSTN terminals, mobile terminals, SIP soft/hard terminals, and H. Various mainstream terminals such as 323 terminals, VT terminals, high-definition terminals, and IPTV terminals can join the conference.
Use pattern diversity. Provide a variety of conference types for users to choose (audio, standard definition video, high definition video, data, combined conferences); provide a variety of conference access methods (platform initiative initiated, users dial the conference access number to join, temporarily join during the conference, Web Ways to access, etc.); provide a variety of screen rendering modes (single screen, multi-screen, round selection, speech control, etc.).
The diversity of billing methods. Provide a variety of billing methods for users to choose (monthly, according to the length of time, according to the number of parties, times, according to media types and related combinations, etc.).
In view of this, combining the technical features and advantages of the IMS network, the use of IMS technology to achieve a converged video conferencing service will be a major direction for the development of future video conferencing.
IMS converged video conferencing embodies personalized IMS-based converged videoconferencing systems. With the help of IMS core network service control capabilities and integrated access capabilities, the unified videoconferencing system is deployed at the IMS service layer to achieve unified management and connectivity for all types of users. Into.
This converged videoconferencing system consists of network elements such as converged conference service platform, portal portal, media resource server MRFC/MRFP, H323 gateway interworking with H323 private network system, mail server, and SMS gateway.
â— Convergence conference service platform: Provides functions such as session control, resource management, authentication, routing, and conference notification, and is connected to the IMS core network through the IMSSIP interface.
â— Portal Portal: Provides users with self-management functions such as conference management and conference site control, and provides users with the ability to directly access web pages to participate in conferences. The public portal HTTP connection is available for users to access.
â— Media Resource Server (MRFC+MRFP): It implements the reservation, distribution, and processing of conference resources, completes the playing of voice announcements, and receives secondary dialing.
â—H. 323 Gateway: Implementing a converged videoconferencing system with the original H. 323 video conferencing system interoperability.
â— SMS gateways and mail servers: Delivery of meeting notifications.
The converged videoconferencing service provided by the above architecture not only satisfies all the functions of the traditional videoconferencing, but also provides the following functions to the user.
1) Multi-type terminals access IMS-based converged videoconferencing terminals that support various capabilities, including telepresence endpoints, high-definition conference endpoints, IMS hardware/software terminals, and H. 323 terminals, softswitch terminals, PSTN phones, mobile phones, etc.
2) Multiple Convergence Types Fusion Convergence Video Conferencing System The same conference site includes multiple types of conferences, including voice conferences, data conferences, telepresence conferences, HD/SD video conferences, and Web conferences.
3) Multimedia format fusion Convergence videoconferencing system supports G. 711, G. 723, G. 729, G. 722, H. 263, H. 264 and other audio and video encoding and decoding formats, support QCIF, CIF, 4CIF, 720p, 1080p and other video frame formats. Supports the existence of multiple media formats in one venue, supporting conversion between different rates and formats.
4) Multiple conference access methods The videoconferencing system supports multiple conference access methods, including:
â— The system automatically invites users to join the conference â— During the conference, the chairperson temporarily invites you to join the conference â— The endpoint dials the conference access number to join the conference â— Joins the conference through the web interface â— Accesses the conference through the IP address 5) Convenient conference management Videoconferencing system support There are various conference management functions for videoconferencing products, including: conference chairperson rights management, audio control (mute, mute), video control (video selection, video layout setting, display mode control, etc.), site lock/unlock, conference recording / Downloads, etc.
The difference from existing videoconferencing products is that the existing videoconferencing products require professional management personnel to implement the control function of the conference site. The conference site management functions of the converged videoconferencing products are realized through the portal portal. The conference chairperson can directly log in to the portal portal to perform the conference site. Control, no special person is responsible.
6) Interoperability Fusion videoconferencing system support and existing H. 323 video conferencing system interworking, H. The 323 conference terminal can access the conference site under the IMS converged video conference system to participate in the conference.
7) Web conference function fusion The video conference system provides Web conference function. Users can directly participate in the conference from Portal Portal.
Currently, full-service operations have become the direction of global operators. IMS, as an effective means to effectively integrate network resources and enhance competitiveness, has become the focus of attention of various operators. IMS converged videoconferencing services can provide flexible and diverse videoconferencing products for different segments of user groups, and build a personalized business operation model that can meet the diverse business needs of users and greatly improve the user's business experience. At the same time, it can enhance the operator's business brand and enhance the market competitiveness, which is the main direction for the operator's future video conference development.
At present, IMS is considered to be the core technology of next-generation networks, and it is also an important way to solve the convergence of mobile and fixed networks and introduce differentiated services such as triple integration of voice, data, and video. Its introduction has laid a foundation for the network operators to provide new multimedia services, in which the converged video conferencing is one of the main applications of the IMS network.
Defects in existing video conferences Looking at the current video conferencing products provided by telecom operators or some equipment manufacturers and Internet application providers to users, the two types are basically divided into the following two types.
1) Hardware-based video conferencing This type of conference mainly uses H. 323 architecture, the overall architecture consists of terminals, gatekeepers, gateways, and multipoint control units (MCUs). The terminal is referred to as H. 323 terminal.
In H. In the videoconferencing architecture of 323, users use the terminal to register, configure, and initiate conferences through the gatekeeper pair H. The 323 terminal performs call control and bandwidth control. Finally, the control of the conference is achieved by mixing and switching the MCU network element audio and video. The gateway is responsible for completing H. 323 Terminal interoperates with other terminals.
Based on H. The 323-based video conferencing is a relatively early video conferencing system based on IP networks. It has special significance from the standpoint of replacing narrow-band conference systems. But during long-term use, H. The defects of 323 videoconferencing products are gradually exposed and are no longer suitable for future business development needs.
Defect 1: The operation is complicated and the threshold is high. The conference management and operation of the 323 video conference are very complex. Before the conference is held, the terminal needs to go through a complicated registration and configuration process before initiating the conference. In the process of the conference, the control of the conference site also needs special personnel to operate. The result of this is the use of H. Users of 323 videoconferencing systems often need professional conference management personnel, and some small and medium-sized enterprises often stop there.
Defect 2: The coverage of the terminal is narrow and the conference place is fixed with H. The 323 videoconferencing endpoint is limited to H. 323 terminal, the user's selectivity to the terminal device is very low, and H. The 323 protocol has special requirements on the IP port, which limits the use of LAN users and directly results in many customers abandoning the use of the service. At the same time, due to interoperability reasons, different H. The 323 video conference system also has different requirements for the terminal. For example, the “New Vision†system of China Telecom requires the terminal to comply with the registration mechanism of New Vision, further limiting the selection range of the user conference terminal.
In addition, H. 323 Video conferences all use specific conference terminals. They must be installed in conference rooms with fixed positions. Users must initiate conferences and participate in conferences to the designated conference rooms, which reduces the convenience of video conferences.
Defect 3: The degree of integration is not enough, facing a single customer group H. 323 video conferences only allow H. 323 terminal access, video conferencing only, integration in the convergence of the terminal, meeting methods, etc. is not enough. Moreover, due to the restrictions of various thresholds, this type of conference is currently only targeted at mid-to-high-end government and enterprise customers, and the customer base tends to be monotonous. This corresponds to a large number of small and medium-sized enterprises that have strong demand for video conferencing due to various factors such as enterprise costs. There is a strong contrast between the two.
2) Software-based videoconferencing These types of conferences are a kind of videoconferencing mode that has emerged quietly in recent years, including client mode and Web mode. A service provider providing this type of conference can establish a video conference server on the Internet, allowing the user to hold a conference through a specific client software or through a designated portal page. The majority of the user's identity authentication and routing are achieved by registering an account.
This type of meeting has greatly improved the ease of use and reduction of the usage threshold. However, since the protocols used are different, and even many software-based video conferencing systems use proprietary protocols, there is a big problem in terms of interoperability. Only the users of the system are allowed to hold conferences. Therefore, the coverage of users is limited.
Future business tends to be open and integrated. Analyze current market and user needs. Future video conferences need to meet the following functional requirements:
The access requirements of different types of users should be met so that users can access the conference immediately, and the cost of using the conference by the user can be minimized.
Easy to use, support users to use the Web browser to make reservations, control, account management, and cost inquiries;
The system is open and interface standards meet the requirements of globalization and cross-domain operations.
Combining the needs of the above three aspects, the future video conferencing system should be developed in the direction of openness, convergence, simplicity, and diversity, making video conferencing products a truly effective and flexible communication tool for users in their daily work and life.
â— Openness: The video conference system should adopt the international standard communication protocol. The service platform should be loosely coupled with the core network, access network, and terminal. It can implement interoperability between devices at different levels and ensure the flexibility of the networking. .
â— Convergence: In addition to supporting videoconferencing, the system should also support audio conferences and data conferences to meet the needs of users at different levels. The coexistence of multiple media formats is allowed in the same venue, and the system adapts to different media formats.
◠Simplicity: Provides web-based portal portals to create conferences, manage venues, and provide a simple, “fool-style†interface that simplifies user operations. As long as broadband is accessible, users can access the portal portal to create conferences and manipulate conferences.
â— Diversity: The diversity here is mainly reflected in the following three aspects.
Terminal diversity. The implementation of the terminal type is not limited from the architecture, including PSTN terminals, mobile terminals, SIP soft/hard terminals, and H. Various mainstream terminals such as 323 terminals, VT terminals, high-definition terminals, and IPTV terminals can join the conference.
Use pattern diversity. Provide a variety of conference types for users to choose (audio, standard definition video, high definition video, data, combined conferences); provide a variety of conference access methods (platform initiative initiated, users dial the conference access number to join, temporarily join during the conference, Web Ways to access, etc.); provide a variety of screen rendering modes (single screen, multi-screen, round selection, speech control, etc.).
The diversity of billing methods. Provide a variety of billing methods for users to choose (monthly, according to the length of time, according to the number of parties, times, according to media types and related combinations, etc.).
In view of this, combining the technical features and advantages of the IMS network, the use of IMS technology to achieve a converged video conferencing service will be a major direction for the development of future video conferencing.
IMS converged video conferencing embodies personalized IMS-based converged videoconferencing systems. With the help of IMS core network service control capabilities and integrated access capabilities, the unified videoconferencing system is deployed at the IMS service layer to achieve unified management and connectivity for all types of users. Into.
This converged videoconferencing system consists of network elements such as converged conference service platform, portal portal, media resource server MRFC/MRFP, H323 gateway interworking with H323 private network system, mail server, and SMS gateway.
â— Convergence conference service platform: Provides functions such as session control, resource management, authentication, routing, and conference notification, and is connected to the IMS core network through the IMSSIP interface.
â— Portal Portal: Provides users with self-management functions such as conference management and conference site control, and provides users with the ability to directly access web pages to participate in conferences. The public portal HTTP connection is available for users to access.
â— Media Resource Server (MRFC+MRFP): It implements the reservation, distribution, and processing of conference resources, completes the playing of voice announcements, and receives secondary dialing.
â—H. 323 Gateway: Implementing a converged videoconferencing system with the original H. 323 video conferencing system interoperability.
â— SMS gateways and mail servers: Delivery of meeting notifications.
The converged videoconferencing service provided by the above architecture not only satisfies all the functions of the traditional videoconferencing, but also provides the following functions to the user.
1) Multi-type terminals access IMS-based converged videoconferencing terminals that support various capabilities, including telepresence endpoints, high-definition conference endpoints, IMS hardware/software terminals, and H. 323 terminals, softswitch terminals, PSTN phones, mobile phones, etc.
2) Multiple Convergence Types Fusion Convergence Video Conferencing System The same conference site includes multiple types of conferences, including voice conferences, data conferences, telepresence conferences, HD/SD video conferences, and Web conferences.
3) Multimedia format fusion Convergence videoconferencing system supports G. 711, G. 723, G. 729, G. 722, H. 263, H. 264 and other audio and video encoding and decoding formats, support QCIF, CIF, 4CIF, 720p, 1080p and other video frame formats. Supports the existence of multiple media formats in one venue, supporting conversion between different rates and formats.
4) Multiple conference access methods The videoconferencing system supports multiple conference access methods, including:
â— The system automatically invites users to join the conference â— During the conference, the chairperson temporarily invites you to join the conference â— The endpoint dials the conference access number to join the conference â— Joins the conference through the web interface â— Accesses the conference through the IP address 5) Convenient conference management Videoconferencing system support There are various conference management functions for videoconferencing products, including: conference chairperson rights management, audio control (mute, mute), video control (video selection, video layout setting, display mode control, etc.), site lock/unlock, conference recording / Downloads, etc.
The difference from existing videoconferencing products is that the existing videoconferencing products require professional management personnel to implement the control function of the conference site. The conference site management functions of the converged videoconferencing products are realized through the portal portal. The conference chairperson can directly log in to the portal portal to perform the conference site. Control, no special person is responsible.
6) Interoperability Fusion videoconferencing system support and existing H. 323 video conferencing system interworking, H. The 323 conference terminal can access the conference site under the IMS converged video conference system to participate in the conference.
7) Web conference function fusion The video conference system provides Web conference function. Users can directly participate in the conference from Portal Portal.
Currently, full-service operations have become the direction of global operators. IMS, as an effective means to effectively integrate network resources and enhance competitiveness, has become the focus of attention of various operators. IMS converged videoconferencing services can provide flexible and diverse videoconferencing products for different segments of user groups, and build a personalized business operation model that can meet the diverse business needs of users and greatly improve the user's business experience. At the same time, it can enhance the operator's business brand and enhance the market competitiveness, which is the main direction for the operator's future video conference development.
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