I don't know, but I doubt that the communication medium makes much difference beyond the individual skills of the people using it. People can use multiple modalities to communicate, and in a situation where some are missing, one varies one's use of the others to accomplish the goal.

In adversarial negotiations one might even find it an advantage not to be seen, to avoid accidentally revealing things one wishes to keep secret. Of course, that applies to both parties, and it will come down to a matter of who is more skilled at using the means available.

People even manage to communicate in writing!