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How to improve the service quality of VoIP

Application VoIP service quality (QoS) has four key steps, if you do not follow these four steps to do, your VoIP implementation will not achieve its full potential. Because, in addition to open the router function, to achieve QoS there are many things to do. Therefore, you have to use some time to plan and design the correct QoS for your voice environment. Here are four key steps:

Step 1: classify your voice communications

First, you need to select the best program to tag the data packets that need to be processed first. Classification includes deciding which data streams can be passed, which data streams to wait. Everyone wants their applications to get the highest priority. But if you do, you will have no time to do other things. QoS is a zero sum game. In this game, with the highest priority, there is a priority. Because VoIP is a real-time, and demanding communication, you need to give it the highest priority class.

The mechanism that we recommend is to validate endpoints. The reason for this recommendation is because when the network is able to verify the IP address of a device, corresponding to the device is a approved of the IP phone, corresponding, the router can also trust the call to provide the communication priority level identification. By using this method, you can protect the network in case of inappropriate use. Endpoint validation can determine which data packets get a high priority and determine which data packets can be supported by the best effort.

In your data packets through before, we recommend that you make a plan, determine what kind of communication will use what a service level, what class of service, and you of each category of communication using labeled what. You also need to mirror your priority class to the entire 2 tier /2 layer, and you need to mirror your priority category to your carrier's service product.

Step 2: open the service class mechanism

Now to open the network router and switch mechanism in order to give priority to the processing of VoIP communication. The important service class (CoS) mechanism is the 802.1p IEEE standard for the routing infrastructure of the DiffServ (service differentiation Architecture) standard and the infrastructure for exchange. You should be able to find that it is very easy to challenge these devices, because you only need to configure the file through the router and switch, you can start CoS.

Step 3: plan and manage your bandwidth

Next, you will need to understand, plan, and manage your bandwidth. You will find that DiffServ and 802.1p QoS are not fully functional IEEE mechanisms. They provide different levels of service, however, they can't solve the problem of over ordering. Therefore, in order to ensure that the voice quality is not affected by this, you need other mechanisms to ensure that you do not have the excess order service class.

At the same time, providing a good quality of VoIP service requires you to predict the number of calls at the same time. Then, you also need to assess whether the bandwidth will be used to support the needs of the program, or to assess whether you need more bandwidth. At this point, financial reality is an inevitable factor, because your budget may not support you in every area of the need for bandwidth. So you have to control the number of users that can access the bandwidth at the same time. In addition, when the bandwidth for a phone, you will get the same feedback information provided with the public switched telephone, that is, the feedback information can be seen as VoIP a "trunk busy" signal.

IP-PBX has this built-in function. They know the structure of the network, and they also have parameters that determine how many voice calls are allowed at each site. When the network reaches this limit, the IP-PBX will give the next person a line busy signal, or will turn the phone to another line (like PSTN).

Step 4: monitor the performance of VoIP

In this last step, you need to monitor performance in order to know if your network provides a high quality transfer and high quality voice playback for voice traffic. If there is a problem, you need to be aware of these issues before your users are unhappy. Because of the special needs of voice, you may need to consider using a new type of monitoring tool.

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