A callbox.
A callbox is a ter'angreal, a few copies of which exist.
Appearance[]
A callbox is a small, gray cube that is carved with intricate patterns that seem to have no end.
Use[]
Using saidar to channel Fire into a callbox causes the ter'angreal to draw in the other powers, as well as saidin. In this way, a male channeler can sense the callbox and hear and speak through it.[1]
Known callboxes[]
A callbox was given to Sevanna by Sammael, using the alias of Caddar, in Kinslayer's Dagger.[2] Sevanna had Someryn use the callbox to summon Sammael.
Moridin, that was spying on them, commented to himself, stating 'It was wonderful what you could learn with a callbox, especially in a world where there seemed to be only two others."
From this comment it is clear that the callbox gifted to Sevanna was linked to two others, one in Sammael hands, and one in Moridin's, from which conversations could be done but also heard and spied.
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