Free VoIP Monitoring

VoIP Monitoring with PRTG Free Version

PRTG is Paessler's easy-to-use free VoIP monitoring software which allows you to monitor VoIP performance.

UDP-based technologies such as video streaming or VoIP technologies are very sensitive to Ethernet jitter, latency and packet loss issues. Unlike TCP-based services (such as HTTP or SMTP), they need a steady stream of data in order to avoid unwanted interruptions or interferences. Therefore, whenever UDP-based services are used, network administrators need to be especially aware of metrics such as latency, jitter and packet loss.

How Can I Resolve a VoIP Latency Issue?

The first step when trying to resolve a latency issue is to monitor the VoIP connection and overall bandwidth usage in the network.

PRTG's network monitor tool offers two powerful methods for VoIP latency monitoring: the QoS sensor measures parameters such as UDP packet loss, jitter, Ethernet latency, etc. For IP-SLA enabled Cisco devices, PRTG's free network monitoring tools include an IP-SLA sensor, which reads similar metrics from those Cisco devices. Both methods show you the quality of your VoIP connection and enable you to define how much VoIP latency, jitter, etc. you are willing to accept. When this threshold is being crossed, you will instantly be notified and can take appropriate measures to reduce the latency issue.

PRTG is More Than Free VoIP Monitoring

PRTG is also an advanced network activity monitor. If little bandwidth is left for VoIP traffic, you can prioritize VoIP traffic or turn other applications off when you are using VoIP. A load test helps you determine how your web server performs under expected loads, whereas stress tests show you the performance of your website under extreme loads. With SNMP, NetFlow and packet sniffing, PRTG offers three bandwidth analyzing methods to choose from. This makes Paessler's a great alternative to MRTG, which only supports SNMP network monitoring. Of course, PRTG can also be used for wireless network troubleshooting.

PRTG Network Monitor

PRTG network monitor tools are available in two editions. For basic free VoIP monitoring, the Freeware Edition may be downloaded and used for personal and commercial use completely free of charge. Need more sensors to monitor a larger IT infrastructure? See our commercial licenses here.


Network Monitoring Software - Version (March 19th, 2019)


Download for Windows and hosted version available


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Up to 100 sensors for free (Price List)

Unified Monitoring

Network devices, bandwidth, servers, applications, virtual environments, remote systems, IoT, and more

Supported Vendors & Applications