How to test the Internet connection if whatsapp and skype are lagging, but the speed is satisfactory?

Question

Computer networks

How to test the Internet connection if whatsapp and skype are lagging, but the speed is satisfactory?
Pings go, speedtest also shows a dozen or two mbps, and voice connections lag and are interrupted for a few seconds. How to collect evidence to poke the provider's nose into them?

Answer 1

to analyze the passage of traffic, there is Wireshark, study its useful thing