Paessler PRTG

Free VoIP monitoring with PRTG:
Improve the performance of your VoIP


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    PRTG serves as a VoIP troubleshooter

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    PRTG monitors VoIP traffic and reduces packet loss

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    PRTG minimizes VoIP jitter
    and latency

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    PRTG reduces VoIP errors and improves performance














PRTG as a VoIP troubleshooter: 5 sensors to help you get started 



Our free VoIP monitoring tool in action


Your VoIP troubleshooting is complete. What will you do with the other 95 free sensors?

PRTG comes with 100 free sensors that you can use for as long as you like. It also comes with free reports and a notification system. PRTG can be accessed on your desktop as well as on our app.



VoIP monitoring software – and much more: The advantages of PRTG    

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Improve the performance of your VoIP

Your video calls keep crashing? Your Internet phone line cuts in and out? With PRTG, you can get to the root of these problems and continually improve the performance of your VoIP. Your coworkers will thank you for it! PRTG helps you keep support tickets to a minimum.

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VoIP troubleshooting

PRTG immediately sounds the alarm whenever something goes wrong with your VoIP. The problem can lie in any number of places, including a router or a defective switch. PRTG provides you with an overview of your entire network. It lets you quickly identify the source of errors and take action immediately. This frees up precious time for other things.

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VoIP traffic analyzer

PRTG analyzes your VoIP traffic over long periods of time. As a result, you can intervene if you notice that the load continues to increase. PRTG reports are ideal for sharing key monitoring data with your superiors.

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Transparent pricing

Looking to set up centralized network monitoring with PRTG? If so, then you’ll want to choose the right license. Regardless of your choice, you’ll get the full range of features of our software. PRTG comes with over 250 preconfigured sensors for all the biggest manufacturers, including Cisco, Dell, and HP. It lets you monitor virtual environments, distributed networks, and much more.


VoIP monitoring software in action: 10 or 10,000 sensors, everything is included  

“We wanted to set up a continuous end-to-end monitoring solution that provides for a comprehensive overview.”

Karsten Wölfer, IT Manager at Jena University Hospital. The hospital monitors servers, routers, switches, VoIP telephones, and medical equipment with our software.To the case study


Your VoIP monitor – even on the go

PRTG is set up in a matter of minutes and can be used on a wide variety of mobile devices.


PRTG comes with all the features you need, plus more your IT infrastructure won't want to live without.

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PRTG monitors these vendors and applications, and more, in one view!



Trusted by 500,000 users and recognized
by industry analysts as a leader

“Fantastic network and infrastructure monitoring solution that is easy to deploy and easier still to use. Simply the best available.”

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“Software is absolutely perfect, Support is superior. Meets all needs and requirements, this is a must have solution if you are needing any form of monitoring.”

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“The tool excels at its primary focus of being a unified infrastructure management and network monitoring service.”

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Your investment in quality of service: PRTG pays for itself in no time

The costs for a one-year PRTG license usually pay for themselves within a few weeks.

PRTG improves the reliability of your IT infrastructure

PRTG improves the reliability of your IT infrastructure

PRTG saves network management costs

PRTG saves network management costs

PRTG saves time spent on network management

PRTG saves time spent on network management


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Practical tip: “Hey Konstantin, what can I do with the PRTG QoS Reflector?”

“When using our QoS (Quality of Service) Round Trip Sensor, you usually need to place a remote probe on a second Windows computer to measure the round-trip values of data packets. With the PRTG QoS Reflector, this is no longer necessary. The Reflector is a Python script that sends data packets from the endpoint back to PRTG. The QoS Reflector also runs on all Linux systems, even a small Raspberry Pi.”

Konstantin Wolff, Software Developer at Paessler AG


VoIP – Frequently asked questions (and their answers)

Which monitoring tools are available?

VoIP monitoring is essentially part of network monitoring. You can choose from open-source software such as Nagios and proprietary tools like SolarWinds and PRTG. As with all tools, the choice is dependent upon the size of your network and the price-performance ratio of the respective provider. PRTG is used by over 500,000 administrators worldwide.  

What is the Mean Opinion Score (MOS)?

The Mean Opinion Score (MOS) rates the voice and image quality of VoIP transmissions. It is the arithmetical average of several parameters. With PRTG, you can measure and keep a constant eye on the MOS. Learn more about MOS monitoring here.

What is packet loss?

Unfortunately, the quality of VoIP can sometimes be lacking. And more often than not, the problem is caused by packet loss. One single lost packet can lead to transmission errors and cause VoIP quality of service to suffer. PRTG lets you monitor the rate of packet loss. Learn more about packet loss here.

What is latency?

Latency is the time that is required for a data packet to travel from its starting point to its destination. It is measured in milliseconds (ms). There are various ways to measure latency. PRTG complies with the standards of the RTCP (RFC 1889). Learn more about measuring and monitoring network latency here.

What is jitter?

Jitter is the deviation from the mean latency value, i.e. the amount of time a data packet needs to reach its destination. PRTG keeps a constant eye on fluctuations in jitter values. Learn more about jitter monitoring here.


Create innovative solutions with Paessler’s IT partners

Partnering with innovative IT vendors, Paessler unleashes synergies to create
new and additional benefits for joined customers.


With ScriptRunner, Paessler integrates a powerful event automation platform into PRTG Network Monitor.

Read more


Siemon and Paessler bring together intelligent building technology and advanced monitoring and make your vision of intelligent buildings and data centers become reality.

Read more


UVexplorer integrates tightly with PRTG to bring fast and accurate network discovery, detailed device inventory, and automatic network mapping to the PRTG platform.

Read more


“Easy to implement and configure with good technical support.”

R. v. S., ICT Manager at Heinen & Hopman Eng BV


PRTG the multi-tool

PRTG: The multi-tool for sysadmins

Adapt PRTG individually and dynamically to your needs and rely on a strong API:

  • HTTP API: Access monitoring data and manipulate monitoring objects via HTTP requests
  • Custom sensors: Create your own PRTG sensors for customized monitoring
  • Custom notifications: Create your own notifications and send action triggers to external systems
  • REST Custom sensor: Monitor almost everything that provides data in XML or JSON format


Still not convinced?



More than 500,000 sysadmins love PRTG

Paessler PRTG is used by companies of all sizes. Sysadmins love PRTG because it makes their job a whole lot easier.

Still not convinced?


Monitor your entire IT infrastructure

Bandwidth, servers, virtual environments, websites, VoIP services – PRTG keeps an eye on your entire network.



Try Paessler PRTG for free

Everyone has different monitoring needs. That’s why we let you try PRTG for free. Start now with your trial.




Network Monitoring Software - Version (May 24th, 2023)


Download for Windows and cloud-based version PRTG Hosted Monitor available


English, German, Spanish, French, Portuguese, Dutch, Russian, Japanese, and Simplified Chinese


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

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