https://web.archive.org/web/19970419202411/http://www1.intel.com/iaweb/ipl/index.htm
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System Recommendations
Intel Pentium® processor–based system, 60 MHz or higher
Windows* 95 or Windows NT* operating system
Half–duplex sound card with speakers or headset
Microphone for voice input
Client: Modem, 28.8 Kbps or faster
Server: ISDN or higher connection to the Internet
An Internet service provider that supports TCP/IP*
"real–time, multi–party audio chat over the Internet" was possible 24 years ago. Meanwhile, on a two–year–old computer, I still have frequent trouble getting Teams audio chats to work without stuttering and breaking up on a 50Mbps connection...