Each cranial nerve exits the skull through naturally occurring openings. Their telepathic abilities are restricted to the transmission of sounds. The receiving function of auditory telepathy could be implemented with current technology. Traditional hearing-aids amplify ambient sound. When the bio-mechanical system of the ear is completely dysfunctional, simply turning up the volume won't help.
Cochlear implants pick up ambient sound and transmit it directly to the cochlear nerve.
Instead of picking up ambient sound, the technology could be easily adapted to pick up the frequencies in which wireless cell phone communication is sent. Because there is no market for such a device. Without the ability to send messages, being able to receive is useless. The ability to send thoughts telepathically is not yet feasible, but a solution may not be that far off. Certainly, it would be possible today to create a device which one could whisper into.