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At present, many government agencies and large enterprises are aware of the advantages of Voice over IP, such as simple wiring, easy networking, high mobility and interfacing with enterprise business systems, thus helping government and enterprises to improve communication efficiency, integrate business resources and save investment and operation and maintenance costs.
However, in actual construction, due to the number of products involved and the complexity of the enterprise's internal network, the reliability, performance and security of large-scale voice over IP projects are always a common concern.
Today we will talk about high reliability first. High reliability involves many aspects, including the product's own hardware and software design, service processing, network deployment and so on.
High reliability of equipment
For electronic products, the level of reliability is often described by the availability of n 9s. n 9s represents the ratio of the uptime of the system to the total time in operation over a year.
As can be seen from the above graph, the telecoms industry requires a very high level of reliability for communications equipment, and the Voice over IP equipment is at the heart of the entire Voice over IP system, controlling and processing all calls, and needs to be sufficiently 'reliable' to achieve an availability of 4-5 9s. The following device-level reliability techniques are generally used.
Selection of high quality components
All high quality components are aged and screened, and the various ASIC devices are of advanced and reliable technology, with strict quality control during assembly.
Backups are provided for important functional modules, including dual power supply redundancy, dual network port redundancy, master control redundancy, master and standby machine redundancy, etc.
Direct plugging and unplugging of certain components or modules during equipment operation without affecting the operation of other components or modules. Common hot-swappable modules include: fans, power supplies, media resource cards/various interface boards, etc.
High reliability of services
In addition to the reliability of the equipment itself, the system will encounter many unexpected situations in the process of handling voice services, such as power failure, network disconnection, board/standalone failure, etc. How to ensure the reliability of voice services under unexpected conditions?
Dynamic balancing of system resources
All media resource cards of the equipment are dynamically allocated to system services and processing load. When one of the resource cards fails, system resources are dynamically migrated to other resource cards to ensure that the total number of system resources remains unchanged.
Redundancy/dual hot standby
The system can be backed up in "1+1 redundancy" or "N+1 redundancy" modes to balance reliability and economy by backing up critical components and vulnerable modules. In general, redundancy switching results in the interruption of the current call.
The more advanced "1+1 real time hot standby" model has no external awareness of the failover (no interruption to the current call/recording). This solution is more costly and is generally used in special industries where reliability is critical.
Voice over IP equipment supports access to both traditional PSTN lines and network-based IP lines (including IMS). In the event of a failure on the power, network or IP platform side, the equipment can quickly switch outbound calls automatically to the local traditional telephone network (PSTN) to ensure normal operation of voice services.
High reliability of the network
When designing a network for a large scale voice over IP project, there must be global considerations, including physical disaster recovery and network routing backup measures for the system, and corresponding safeguards to ensure normal operation of voice over IP in the event of a node failure.
The "N-1" rule
N-1 circuit reliability: The removal of any one connection from the network topology does not affect the connectivity of the nodes, which requires each node to have at least two unrelated circuits connected to other nodes.
N-1 node reliability: the removal of any node from the network topology does not affect the connectivity of other nodes.
A distributed architecture is recommended for multi-point deployments of voice over IP networks. Each point deploys an independent IP telephony system, and failure of a single point does not affect the operation of the entire network.
What are the high reliability of our Voice over IP solutions
- Telecom-grade professional hardware platform
- 99.99% carrier-grade reliability
- Fully modular design with hot-swappable support
- Power supply redundancy
- Network port redundancy
- Master card redundancy
- Automatic load balancing of media resource cards
- Master/standby switching time <5 seconds
- Power/network outage escape
- Distributed networking
Of course, not every solution has to use all the above high reliability features, but is scientifically tailored to the site environment and actual needs. For example, if the network link is unstable, a distributed architecture is recommended, with each individual node well configured for redundant backup, disconnection escape, etc.
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