What was the response to the problem of proprietary modem protocols that limited the ability of modems from different manufacturers to talk to each other?

What will be an ideal response?

In response, the International Telegraph and Telephone Consultative Committee (CCITT), a European standards body, established standards for modems. These standards, known generically as the V standards, define the speeds at which modems can modulate. The current modem standard now on the market is the V.92 standard. In addition to speed standards, the CCITT, now known simply as the International Telecommunication Union (ITU), has established standards controlling how modems compress data and perform error checking when they communicate.