"If you want security you need fiber optic (VoIP or not) that measures light passing through the fiber and can detect if some of it is being diverted to listen in."
What? Perhaps you could elaborate on what exactly you mean by light being diverted. But if it were me, I would break the transmission line, and insert a circuit between the lines. Then I would simply use some device to duplicate the incomming wave. Then the person who I am spying on sees no difference in the information he receives. To initially install this circuit, I would probably force a power outtage, or some other incident to divert their attention from the fiber optic connection.
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"If you want security you need fiber optic (VoIP or not) that measures light passing through the fiber and can detect if some of it is being diverted to listen in."
What? Perhaps you could elaborate on what exactly you mean by light being diverted. But if it were me, I would break the transmission line, and insert a circuit between the lines. Then I would simply use some device to duplicate the incomming wave. Then the person who I am spying on sees no difference in the information he receives. To initially install this circuit, I would probably force a power outtage, or some other incident to divert their attention from the fiber optic connection.