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Yes, actually the answer to your question can be found in UT.
'Alone the palantiri could only "see": they did not transmit sound.... But when another mind occupied a Stone in accord, thought could be "transferred" (recieved as "speech") and visions of the things in the mind of the surveyor of one Stone could be seen by the other surveyor....
'Two persons, each using a Stone "in accord" with the other, could converse, but not by sound, which the Stones did not transmit. Looking one at the other they would exchange "thought" -- not their full or true thought, or their intentions, but "silent speech", the thoughts they wished to transmit (already formalized in linguistic form in their minds or actually spoken aloud), which would be recieved by their respondents and of course immediately transformed into "speech", and only reportable as such.'
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