How to choose the right IP webcast intercom host?

I. Overview of IP Network Broadcast and Intercom System

1. Definition and Principle

The IP network broadcast and intercom system is a new communication method based on Internet Protocol (IPv4/IPv6) and Internet technology, realizing the organic combination of multiple communication methods such as digital audio, network transmission, e-mail, text messages, video, and data. Its core principle is to convert audio signals into digital data and transmit and broadcast them through the IP network. The system usually includes key components such as audio input and output devices, data compression and decompression algorithms, and management and control interfaces to provide comprehensive intercom and broadcast functions.
The advantage of this system lies in its high flexibility and scalability, allowing users to easily add or reduce terminal devices according to their needs and enabling voice communication and broadcasting among multiple locations. By adopting advanced audio codec technologies, the system can automatically adjust audio quality according to network bandwidth and device performance, optimizing resource utilization while ensuring communication effectiveness.

2. Application Scenarios

Relying on its high efficiency and flexibility, the IP network broadcast and intercom system shows broad application prospects in multiple fields. Besides educational institutions mentioned earlier, this system also plays an important role in the following typical scenarios:

1. Residential Community Property Management: It is used to release notices, conduct emergency broadcasts, and play background music, improving the living experience and security.

2. Commercial Complexes: It realizes functions such as real-time promotional broadcasts and emergency evacuation guidance, improving operational efficiency and customer safety.

3. Industrial Parks: It is used for production scheduling, security monitoring, and emergency notifications to ensure production and personnel safety.

4. Hospitals: It realizes functions such as ward calls, information release, and emergency notifications, improving patient service quality and medical security.

5. Public Transportation Hubs: It is used for passenger guidance, shift announcements, and emergency broadcasts to ensure passenger safety and service quality.

These diverse application scenarios fully demonstrate the important position of the IP network broadcast and intercom system in modern life and provide efficient communication and management tools for different industries.

II. Key Factors in Selecting the Host

1. Analysis of Functional Requirements

When selecting the host of the IP network broadcast and intercom system, the analysis of functional requirements is a crucial step. To ensure that the system can meet the needs of specific scenarios, we need to carefully consider the following key functions:

1. The voice intercom function is the core of the IP network broadcast and intercom system. An ideal host should support two-way voice intercom and possess high-quality audio processing capabilities. For example, some high-end hosts adopt the ARM + DSP architecture, equipped with high-fidelity gooseneck microphones and echo suppression functions to ensure a clear and natural communication experience. In addition, the host should also support the one-click call function to facilitate users to quickly establish intercom connections.
2. The broadcast function cannot be ignored either. An excellent host should have the capabilities of broadcasting to the whole area, broadcasting to specific zones, and broadcasting to a single point to meet the requirements in different scenarios. Some advanced systems even allow the control center to randomly combine the broadcast points at exits and entrances to achieve more refined broadcast control. In emergency situations, the system should be able to quickly start the emergency broadcast mode to convey important information in a timely manner.
3. The monitoring function is another important feature worthy of attention. A high-quality host should have the remote monitoring capability, allowing managers to monitor the audio signals of any terminal at any time. This function not only helps to monitor the on-site situation in real-time but also enables monitoring of the on-site environment when necessary, providing a basis for decision-making.
4. Moreover, some special scenarios may require additional functional support. For example, in a parking lot management system, the host may need to integrate the remote gate opening function to quickly release passages in emergency situations. In educational institutions, the system may need to support background music playback and scheduled program arrangements to create a comfortable learning atmosphere.

By carefully evaluating these functional requirements, we can better select an IP network broadcast and intercom host suitable for specific application scenarios, ensuring that the system can effectively meet the actual needs and provide high-quality communication and broadcast services.

2. Consideration of Performance Parameters

When selecting the host of the IP network broadcast and intercom system, performance parameters are the key indicators for evaluating the system quality. This section will introduce in detail the performance considerations in several main aspects:

1. Audio Processing

Audio processing is one of the core functions of the IP network broadcast and intercom system. High-performance hosts usually adopt advanced audio coding technologies, such as G.711, AAC-LC, or MP3, etc., to balance audio quality and bandwidth efficiency. These coding technologies can provide high-quality audio transmission under limited network bandwidth. Specifically, the audio processing performance can be measured from the following aspects:

Parameter	Typical Value
Frequency Response	20 Hz - 20 kHz
Dynamic Range	> 90 dB
Signal-to-Noise Ratio	> 80 dB
Total Harmonic Distortion	< 0.5%

2. Network Transmission

The performance of network transmission directly affects the stability and reliability of the system. The key parameters include:

• Bandwidth Occupancy: Usually between 64 kbps and 256 kbps, depending on audio quality and coding methods.
• Delay: It should be controlled within 200 ms to ensure a real-time interactive experience.
• Packet Loss Recovery: Adopt FEC or ARQ technologies to ensure audio continuity.

3. Call Processing

The call processing capability reflects the concurrent processing ability and response speed of the system:

• Maximum Number of Simultaneously Online Users: It can reach hundreds to thousands.
• Maximum Number of Simultaneous Calls: Usually between dozens to hundreds.
• Call Setup Time: It should be completed within 1 second.

4. Other Key Performance Indicators

In addition to the above parameters, the following indicators also need attention:

• Power Efficiency: Usually powered by PoE, with power consumption between 10W and 30W.
• Environmental Adaptability: The operating temperature range is generally -10°C to 50°C, and the relative humidity is < 90%RH.

By comprehensively considering these performance parameters, an IP network broadcast and intercom host that can meet current needs and has the potential for future expansion can be selected.

3. System Compatibility

When selecting the host of the IP network broadcast and intercom system, system compatibility is a crucial consideration factor. Good compatibility can not only ensure the smooth deployment and operation of the system but also lay the foundation for future expansion and upgrades. Here are the compatibility considerations in several key aspects:

1. Protocol Compatibility

The IP network broadcast and intercom system usually adopts the SIP (Session Initiation Protocol) standard protocol, which is an open standard widely used in the VoIP (Voice over Internet Protocol) field. The advantage of the SIP protocol lies in its flexibility and scalability, being able to support multiple communication modes such as voice, video, and instant messaging. However, it is worth noting that there may be slight differences in the implementation of different manufacturers, resulting in certain interoperability issues. Therefore, when selecting a host, special attention needs to be paid to the implementation details of its SIP protocol to ensure good compatibility with other SIP devices.

2. Terminal Device Compatibility

High-quality IP network broadcast and intercom hosts usually can support multiple types of terminal devices, such as:

• Lectern Machines: Suitable for classrooms or meeting rooms
• Floor Collection Sub-control Machines: Used for floor broadcast control
• Campus Entrance Machines: Installed at school gates or main entrances

The compatibility of these terminal devices is crucial to the overall functions of the system. For example, some advanced systems support sending local audio signals to specific terminal devices to achieve directional broadcasting or shouting functions. This flexibility greatly improves the practicability and adaptability of the system.

3. Audio Format Compatibility

The compatibility of audio formats cannot be ignored either. Excellent IP network broadcast and intercom hosts usually support multiple audio coding formats, such as G.711, AAC-LC, and MP3, etc. This diversity ensures that the system can provide the best audio quality under different network conditions. Meanwhile, it also facilitates the integration of the system with other audio devices, such as seamless docking with existing audio players or recording devices.

4. Software Compatibility

At the software level, system compatibility is mainly reflected in two aspects: operating system support and integration with third-party applications. Some advanced systems adopt the Embedded Linux System, which not only improves the stability and security of the system but also provides convenience for subsequent function expansion and customized development. Meanwhile, many systems provide SDK (Software Development Kit), enabling developers to conduct secondary development according to specific needs and achieve in-depth integration with existing management systems or other third-party applications.

5. Compatibility Differences among Different Brands of Hosts

There are certain differences in compatibility among different brands of IP network broadcast and intercom hosts. Some well-known brands, such as Hikvision, greatly enhance system compatibility by providing comprehensive SDKs and detailed development documents. Their systems can be well integrated with various telephone systems, fire protection systems, and monitoring systems, providing users with a complete solution. In contrast, the products of some small manufacturers may have insufficient compatibility, especially in terms of interoperability with devices of other brands.
When selecting the host of the IP network broadcast and intercom system, system compatibility is a multi-dimensional consideration factor. Besides the aspects mentioned above, the network compatibility and power compatibility of the system also need to be considered. Only by comprehensively evaluating the compatibility of the system can we ensure that the selected host can seamlessly connect with the existing IT infrastructure and other related systems and fully play its due functions and benefits.

4. Security Performance

When selecting the host of the IP network broadcast and intercom system, security performance is a crucial consideration factor. High-quality systems usually adopt multiple security measures, including:

1. Encryption Technology: AES-256-bit encryption to protect communication content
2. Access Control: Role-based permission management to restrict system access
3. Firewall Protection: Prevent unauthorized access and protect the internal network
4. Log Auditing: Record system activities to facilitate tracking of abnormal behaviors

These security measures jointly build a multi-level security defense system, effectively safeguarding the communication security and data privacy of the system. By implementing strict encryption mechanisms and access control policies, the system can effectively resist potential network threats and ensure the confidentiality and integrity of key information.

III. Comparison of Main Types

1. Embedded Hosts

In the IP network broadcast and intercom system, embedded hosts play a key role. These hosts integrate audio processing, network communication, and control functions into one, featuring a compact size and convenient installation. They usually adopt the Embedded Linux System, providing a stable operating environment and rich development interfaces. The core advantage of embedded hosts lies in their highly integrated design, making system deployment more flexible and especially suitable for scenarios with limited space or the need for rapid deployment.
These hosts support multiple audio formats and coding methods, such as G.711, AAC-LC, and MP3, etc., ensuring wide compatibility and sound quality assurance. In terms of functions, embedded hosts usually possess basic functions such as real-time intercom, broadcast announcements, and monitoring. Some advanced models also integrate special functions such as remote gate opening to meet the unique needs of specific industries. This multi-functional integrated design not only simplifies the system architecture but also helps reduce the total cost of ownership, making it an ideal choice for small and medium-sized projects.

2. Server-type Hosts

In the IP network broadcast and intercom system, server-type hosts play a core role, responsible for coordinating and managing the operation of the entire system. The main features of these hosts include:

1. High Capacity Processing Ability: Support a large number of concurrent connections and complex functions
2. Double Machine Hot Backup Mechanism: Improve system reliability and stability
3. DRBDStorage Solution: Ensure real-time data synchronization and data integrity during fault switching
4. Virtual IP Address: Simplify network configuration and management

Server-type hosts are especially suitable for large enterprises and public places, such as airports, railway stations, and shopping malls. These scenarios usually need to handle a large number of audio streams and user requests. By adopting advanced technologies and designs, server-type hosts can provide high-quality and highly reliable IP network broadcast and intercom services to meet various complex communication needs.

IV. Purchase Process

1. Needs Assessment

When selecting the host of the IP network broadcast and intercom system, needs assessment is a crucial initial step. At this stage, multiple key factors need to be comprehensively considered to ensure that the finally selected system can perfectly match the needs of specific scenarios. Here are the main aspects of the assessment:

1. Usage Scenario Analysis

Firstly, it is crucial to clarify the specific application scenario of the system. Different scenarios have different requirements for the IP network broadcast and intercom system. For example:

Scenario	Special Requirements
School	Zone broadcasting, class bell ringing
Hospital	Emergency calls, privacy protection
Factory	High noise environment, explosion-proof requirements
Shopping Mall	Background music, advertisement insertion

A deep understanding of the unique requirements of each scenario can help determine the core functions and performance indicators of the system.

2. Refinement of Functional Requirements

Secondly, it is necessary to list in detail the functions required by the system. This includes but is not limited to:

• Intercom Function: Two-way communication, one-click call
• Broadcast Function: Zone broadcasting, emergency broadcasting
• Monitor Function: Remote monitoring, environmental monitoring
• Special Functions: Such as remote gate opening, video linkage

3. Consideration of Performance Parameters

Performance parameters are the key indicators for evaluating system quality. Focus on:

• Audio Processing: Frequency response, dynamic range
• Network Transmission: Bandwidth occupancy, delay
• Call Processing: Concurrent user numbers, call setup time

4. Budget Planning

Reasonable budget planning is equally important. It is necessary to balance system performance and cost to find the best cost-performance ratio. Meanwhile, considering the long-term use of the system, it is also advisable to reserve a certain budget space to cope with possible future upgrade needs.

5. Evaluation of Expandability

As an organization develops, the system requirements may change. Therefore, when conducting the evaluation, the expandability of the system should be taken into account, including:

• Modular design of hardware
• Convenience of software upgrading
• The system's capacity expansion ability

Through a comprehensive needs assessment, a clear direction can be provided for the subsequent selection process, helping to choose the IP network broadcast and intercom host that best meets the actual needs.

2. Scheme Design

When selecting the host of the IP network broadcast and intercom system, multiple key factors need to be comprehensively considered during the scheme design stage to ensure that the system can meet the needs of specific scenarios and achieve efficient operation. The following are several aspects that need to be focused on in the scheme design process:

1. System Architecture Design

The system architecture design should be based on the distributed server architecture to ensure the flexibility and expandability of the system. This architecture allows for the continuous addition of server nodes as needed, thereby improving the processing capacity and coverage of the system. Meanwhile, adopting a hybrid mode of B/S (Browser/Server) architecture and C/S (Client/Server) architecture can achieve a more flexible management and control method. Specifically, the following architecture can be adopted:

• Control Center: Responsible for the core management and control functions of the system.
• Sub-control Center: Used to implement the broadcast and intercom functions in local areas.
• Terminal Devices: Distributed throughout the network to perform specific broadcast and intercom tasks.

2. Division of Functional Modules

In terms of the division of functional modules, it is necessary to consider the core functions of the system and reasonably allocate them to different modules. Typical modules include:

• Audio Processing Module: Responsible for audio encoding, decoding, and transmission.
• Network Transmission Module: Handles the transmission and routing of data in the network.
• Call Processing Module: Manages call requests and connection establishment.
• Security Management Module: Responsible for access control and data encryption of the system.

3. Optimization of Performance Parameters

The optimization of performance parameters is the key to ensuring the efficient operation of the system. The parameters that need to be focused on include:

• Audio Quality: Adopt encoding formats such as G.711, AAC-LC, or MP3 to balance audio quality and bandwidth efficiency.
• Network Transmission: Optimize bandwidth occupancy, usually between 64 kbps and 256 kbps, and control the delay within 200 ms.
• Call Processing: Improve the concurrent processing ability and shorten the call setup time.

4. Compatibility Design

Compatibility design is the foundation for ensuring the smooth deployment and long-term stable operation of the system. The factors that need to be considered include:

• Protocol Compatibility: Ensure that the system supports standard protocols such as SIP to achieve interoperability with other systems.
• Terminal Device Compatibility: Support multiple types of terminal devices, such as lectern machines and floor collection sub-control machines.
• Audio Format Compatibility: Support multiple audio encoding formats to improve the adaptability of the system.

5. Security Performance Design

Security performance design is the key to protecting the system from unauthorized access and attacks. The measures that need to be taken include:

• Encryption Technology: Adopt AES-256-bit encryption to protect communication content.
• Access Control: Implement role-based permission management to restrict system access.
• Firewall Protection: Deploy firewalls to prevent unauthorized access.

By comprehensively considering these factors, a functional, high-performance, highly compatible, and secure IP network broadcast and intercom system scheme can be designed. Such a scheme can meet the needs of different scenarios and provide users with high-quality communication and broadcast services.

3. Supplier Selection

When selecting suppliers of IP network broadcast and intercom system hosts, the main competitors in the market include well-known enterprises such as Hikvision, Dahua Technology, and Keda Technology. These suppliers each provide unique solutions to meet the needs of different scenarios:

Supplier	Product Features	Applicable Scenarios
Hikvision	Double machine hot backup mechanism, DRBD storage solution	Large public places, such as airports and railway stations
Dahua Technology	High-definition voice quality, intelligent noise reduction technology	Educational institutions, corporate offices
Keda Technology	Powerful API support, easy to integrate	Government departments, financial institutions

The products of these suppliers have their own advantages in terms of functions, performance, and compatibility, and can meet the needs of different customer groups. When selecting a suitable supplier, factors such as project scale, budget, and technical requirements should be considered to ensure the best return on investment.

V. Installation and Debugging

1. Network Configuration

During the installation process of the IP network broadcast and intercom system, network configuration is a crucial link. The system is usually deployed using local area networks or wide area networks and supports static or dynamic IP address allocation. To ensure the normal operation of the system, the following points need to be focused on:

1. Network Topology: Adopt a star or tree structure to ensure data transmission efficiency.
2. VLANPartitioning: Reasonably divide virtual local area networks to improve network security and performance.
3. QoSSettings: Optimize the quality of service to ensure the stability and low latency of audio transmission.
4. Port Mapping: Correctly configure router port mapping to support cross-segment communication.
5. DNSResolution: Set the correct domain name resolution to facilitate host name access.

By carefully configuring these parameters, the network performance and reliability of the system can be significantly improved, laying a solid foundation for high-quality audio transmission.

2. Function Testing

After the installation of the IP network broadcast and intercom system is completed, conducting comprehensive function testing is a crucial step to ensure the normal operation of the system. The following are several main function test items:

1. Real-time Intercom Function: Check the quality and stability of two-way voice communication.
2. Broadcast Function: Verify the effects of broadcasting to the whole area, broadcasting to specific zones, and broadcasting to a single point.
3. Monitor Function: Evaluate the clarity and response speed of remote monitoring.
4. Emergency Broadcast: Test the trigger mechanism and coverage of broadcasting in emergency situations.
5. Special Functions: Such as remote gate opening and background music playback, to ensure their normal operation.

These test items cover the core functions of the system. By verifying them one by one, the performance and reliability of the system can be comprehensively evaluated.