@SkyWhisperer - In the telecommunications industry network latency is one of the chief concerns for services that use the Voice Over Internet Protocol. This is a packet-based approach to sending phone calls. The voice transmissions are chopped up and bundled into packets and then put back together on the other end of the call. When there is latency, the packets don’t arrive at the destination at the same time. This causes the familiar delay that people who use these services complain about.
Latency has improved over the years so that now these phone calls sound as clear as regular calls, with virtually no latency.
Engineers use a network latency simulator and do some other calculations with network bandwidth usage to improve the efficiency of the network and improve phone call quality. But as you mentioned, you’re still using the Internet so if there are Internet latency issues then no doubt it will affect call quality.