Delta4Embassy
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"(Phys.org)—A trio of researchers with the University of California has found that marmosets learn to wait for others to stop making noise before they vocalize, at a very young age. In their paper published in Proceedings of the Royal Society B, Cecilia Chow, Jude Mitchell and Cory Miller describe a study they undertook with young marmoset twins and their parents and what they learned by doing so."
Marmosets found to learn to take turns when vocalizing
Not much of a discussion if 2 or more people are talking over each other on-air. Even lesser primates learn not to.