Are there any channel monitoring tools for IP-telephony?

Question

Telephony

A company with a small call center for 20 operators in Rostov-on-Don. IP-telephony provider with a data center in St. Petersburg. Calls are made from a PC using softphones. Periodically there are inexplicable problems with voice traffic (the rest is working properly). Channel - 10 Mbps cable up and down.
I would like to have some kind of troubleshooting tool that could quickly test the channel and point out bottlenecks. The telephony provider was able to squeeze out only a utility for ping and route tracing. I would like to believe that there are normal tools for analysis, with the help of which it will be possible to speak with the provider in detail, and not to figure out for weeks where and what is not working properly.

Answer 1

Channel - 10 Mbps cable up and down.

And now look (in case not only the voice is allowed through the cable). One of the bored users opens habrahabr.ru. For a fraction of a second, there is a sharp surge in channel load, it is completely clogged with traffic, HTTP packets push out several RTP packets, and a short-term decrease in communication quality is observed. Another employee launched a torrent on the jump? The voice is already radically damaged.
Diagnostics? Any normal softphone shows statistics on the quality of the RTP stream. Loss, jitter. We need to keep an eye on these numbers.
In general, if it is not possible to apply QoS in any form on both sides of the channel, or the channel capacity does not exceed the actual requirement by tens/hundreds of times, select a separate channel strictly for the voice. He behaves decently, evenly, without splashes.
Ideally, launching Voice over the Internet should be avoided.

Answer 2

sipqos

Answer 3

winmtr

Answer 4

voipmonitor.org