Voice services in modern NGN networks, which received a sound name "voice over IP" or VoIP (Voice-over-IP), represent one of the main trends in development of today’s services.
Quality control of VoIP services becomes one of the key indexes of telecoms operator’s competitive abilities in current conditions. Subscriber’s loyalty depends directly on the level of VoIP services, especially in conditions of strategic switch over from traditional telephony (TDM) to VoIP.
Advantages of Qualitymaster.VoIP
The present-day market has quite a wide range of VoIP service quality control systems. Systems of such class use very different indexes and methods, but Qualitymaster.VoIP – is the only system oriented to quality of telecommunication services, which combines measurement tools for communication service quality control and means of centralized management of SLA reports for demarcation of operator’s areas of responsibility.
Nowadays the leading telecoms operators choose Qualitymaster.VoIP due to unique advantages, this system provides:
- Convenience of methods. Methods, used in the system allow to estimate VoIP service quality in one connection point, i.e. from one side. This is especially convenient for interoperator SLA control systems.
- Usage of complete and selective control methods. Qualitymaster.VoIP uses the principle of complete control of real traffic. In this case testers of VoIP service quality are all network subscribers. Application of method of complete control together with selective control (analysis of separate calls, test calls, etc.) ensures high accuracy. There is used interpretation of results within extrapolational model "from test call to real call", which makes this solution highly valuable.
- Integrated system. Qualitymaster.VoIP is the component of the system Qualitymaster , data about VoIP services quality correlate with data about channel level quality indexes or key performance indexes (KPI) of other communication services (underlying services).
- Flexibility and scalability of the industrial level. Qualitymaster.VoIP is the leader in supporting of industrial standards and provision of industrial scalability. The system has standard components of common use, which ensure support of a wide range of hardware probes and agents, which are integrated in equipment and IT-systems of different manufacturers.
- Integration with applications and business processes of a company. Qualitymaster.VoIP was developed in accordance with the concept of service oriented architecture (SOA) and business process management (BPM). This allows to flexibly integrate the system into the existing OSS/BSS infrastructure of an operator at minimum costs.
Key quality indexes of VoIP service (KPI VoIP)
The following KPI serve as priority indexes of trunk and long distance communication service quality, which are largely related to perception of service quality by the customer:
- number of calls (traffic level);
- number of successful calls;
- number of unsuccessful calls;
- time of connection establishment;
- time of connection termination;
- NER (Network Effectiveness Ratio);
- ASR (Answer Seizure Ratio);
- ABR (Answer Bid Ratio);
- statistics for the field Cause ITU-T Q.850;
- conversation time;
- number of short conversations (less than 15 s);
- number of repeated short conversations (conversation, shorter than 15 s after a short conversation less than 15 s).
The last two KPI ensure better than MOS, PESQ and R-Factor indexes, estimation of quality level according to a group of voice signal quality indexes.
Quality indexes of the second priority level make more than 150 KPI, which increase reliability of VoIP service quality estimation in operator’s network.
Generation of integral VoIP service quality indexes (KQI VoIP)
Based on measured KPI Qualitymaster.VoIP generates integral service quality indexes (KQI), which can be used for planning, development and reconstruction of network.
KQI reflect the level of quality perception by end users (QoE) to the extent possible.
User interface
Qualitymaster.VoIP allows users to control quality of communication services by way of Web-interface, quickly and accurately locate failures, detect unstable faults of network resources, promptly react to decrease of communication service quality.
User interface can be easily adapted to client’s needs by adding required information and changing of its formats.
SLA report
The system draws reports about quality of services in accordance with SLA of customer or interoperator (partner) type. In case of SLA breach the system sends notifications to customer support service and to network operations center.
Integration into an existing OSS/BSS infrastructure
Qualitymaster.VoIP was developed taking into account that any company already has incidents management systems and established business processes. That is why the system must be capable of easy integration into existing IT-environment of a company in the shortest time and at minimum cost.
The basis of Qualitymaster.VoIP integration is service oriented architecture (SOA) and open interfaces (WSDL/SOAP/XML). The system is integrated with well-known systems Incident Management, Fault Management and Performance Management, which have open standard interfaces.
