This was found at digg.com:
"I recently received a “cold” call from a web marketing firm that suddenly took a turn for the worse.
Also, a little background: I have what is medically described as “profound” hearing loss in one ear, and “severe” hearing loss in the other. For the most part I can do OK with telephone conversations, but occasionally need to ask a person to repeat something. This is especially true when the caller has an accent (relative to mine), or the call is coming from an IP phone.