Thanks for the info. I'm going to continue to investigate. I can confirm that running lsof and grepping for Skype on my OSX box, only pulls up one line that shows the service listening. Here is the details:

Skype 13357 userxxx 4u REG 14,2 13312 8749712 /Users/userxxx/Library/Caches/com.skype.skype/Cache.db