SIP honeypot

First pass at a SIP honeypot!  Currently responds with a 404 for any
REGISTER request and a 407 for any INVITE request.
Pasted twice?

Apparently, I got the code pasted into the file twice?  WTH?
Cleanup from Johnny's comments

Cleaned up the things requested by Johnny.
Merge pull request #209 from cmsmith1977/udp_sip

SIP honeypot