ABSTRACT
Nowadays, the Voice over Internet Protocol (VoIP) is widely used both in the large networks as well as in SOHO (Small Office, Home Office) networks. This reason is that the audio or video packet data communications bring a consolidation of transmission networks which means economic benefit for network providers and end users. The most IP Telephony Operators reduce the VoIP payload the way that the stream is separated from the rest of the network using virtual LANs (Local Area Networks), even though, it is necessary to monitor the quality of calls on each node. Measuring the quality of lines is important but often overlooked part not only of IP telephony. At the beginning of the VoIP service development, there were many quality of service issues (Pravda & Vodrazka 2007), which were step by step resolved by additional recommendations. However not all recommendations are implemented by VoIP Operators and end users, so there is still necessary to monitor VoIP infrastructure by external monitoring tools. The operator can monitor VoIP infrastructure by hardware or software tools implemented inside its infrastructure. There are several tools available for this purpose. When the Operator wants to monitor its infrastructure remotely as a service, the monitoring service provider needs to implement monitoring probes, which send results to the monitoring center or dedicate part of its infrastructure for service calls, which will be used to provide necessary data to the monitoring center. This paper offers a solution, how to monitor VoIP infrastructure remotely without any hardware or software implementation into VoIP Operators infrastructure.
