DO NOT treat VoIP controls as something secondary, which can be postponed until tomorrow.
Some new technologies are working properly on their own even before they are equipped with effective management tools. However, such technologies, as a rule, are not part of the services that are critical for the company’s business. IP-telephony technology replaces one of the main business services – traditional telephony. No failure will cause such chaos and confusion that will arise when a telephone connection is broken. So get your hands on effective VoIP management tools before the first call comes through.
DO NOT ignore means of prioritizing and managing the quality of voice traffic services.
Second in importance after the implementation of the management system is the implementation of guaranteed quality of service (QoS) mechanisms. Unlike traditional telephony, VoIP devices use transport technologies without connection and without hard allocation of resources. At the same time, the nature of voice traffic is sensitive to delays, and QoS mechanisms are necessary to ensure acceptable quality of telephone communication and its accessibility. Some enterprises prefer not to implement QoS mechanisms, considering them very complex. This is partly true, but there are good management tools on the market with acceptable default settings for QoS mechanisms. Even the use of preset QoS parameters looks preferable than the absence of QoS mechanisms in general.
Remember that providing excess bandwidth is not an equivalent alternative to traffic management and service quality! As soon as the voice traffic enters a geographically distributed network (WAN), you will not have enough money or bandwidth with your strategy for allocating redundant resources. Implement QoS algorithms to enable you to prioritize traffic and allocate the necessary bandwidth, ensuring an appropriate level of service and maximizing the available resources.
It is not possible to control the data and speech transfer, and QoS mechanisms in the same network using separate tools.
You do not give each member of your family a separate checkbook so that he can withdraw money from a general family bank account. Exactly the same rules exist in a network with common, but limited resources. Although it may seem tempting to leave control of the data transfer as it is and add another application to manage voice traffic, separate applications will not provide the opportunity for priority and rational allocation of services on the same network.
Moreover, after all, it is also necessary to manage QoS algorithms. The integrated solution will give you a complete picture of what is happening on the network so that you can make the most of the network resources. Voice, data and QoS management must be managed within a single integrated application to provide services within a single infrastructure effectively.
ONE CAN NOT be 100% sure that the IP network will cope with additional surplus voice traffic
Adding voice traffic to an existing IP network significantly increases the requirements for both its throughput and additional network services. Compared to the traditional telephone-switching infrastructure, IP networks with its packet switching mechanism are much more unstable. Therefore, even before the introduction of VoIP systems, it is necessary to conduct a comprehensive check of LANs and WAN-networks in order to determine their readiness to support new systems. A thorough examination will avoid some typical errors, for example, when VoIP systems are tested (before use) only on LANs or rely on routers that do not support QoS mechanisms.
DO NOT postpone the questions of voice communication quality to complaints from end users start to come.
In order to provide a good service for voice transmission, it is necessary to continuously monitor end-to-end quality in real time and generate relevant reports. It is extremely important to guarantee the quality of voice communication over the IP network at the same level as exists in traditional telephony. For this, the quality of speech needs to be measured by the same standard methods. The telephone industry has been using the MOS (Mean Opinion Score) for many years now.
Currently, algorithms are available that allow the VoIP management tools to automatically issue the MOS score.
Receiving MOS estimates provides continuous monitoring of telephone communications quality. As soon as the quality starts to deteriorate, you will immediately learn about it and will be able to solve the problem before it is noticed by your users. Knowing the current MOS indicators is also helpful in troubleshooting and scheduling bandwidth (you can anticipate an increase in the volume of phone calls and prepare a network infrastructure for this). Therefore, do not forget to include means of measuring the current quality of voice communication in your plan for deploying the IP telephony system.
DO NOT forget about the proper training and the skills of specialists involved in speech and data transmission systems.
Until now, high-tech professionals are often divided into telephone operators and data transfer specialists. The reason for this division is clear – until recently, these two areas of communication existed, it would seem, in parallel worlds. Suffice it to say that the peculiarities of the operation of IP networks often contradict the system of indicators that exist in the field of traditional telephony (for example, with a reliability index of “five nines”).
Today, both sides need to understand well the features of various services provided on the basis of unified network infrastructure, in particular, to clearly know the parameters that can be operated to maximize productivity and make the most efficient use of resources. Providing voice and data transmission over one network is an important step that requires serious preparation of both groups of specialists.
DO NOT hurry with the unreasonable introduction of VoIP technology.
IP-telephony is still a very new technology, and its comparison with existing telephone services is inevitable. Avoid the temptation to go the shortest way, because, as a rule, you have only one chance to do something right. Haste at the very beginning of the implementation process can undermine the implementation of the whole project and disrupt the work of the main business services, so spare no time for preliminary planning, testing VoIP equipment and managing tasks.
It is necessary to approach the issues of VoIP system planning, preliminary equipment testing, measurement of the most important characteristics, as well as system management and personnel training very carefully. The success of your work depends on this.