Hello,
debug messages printed to syslog from the source code are because
the developer needed/wanted them for troubleshooting.
As an admin, you have the option of using xlog to print what ever
messages you want. In 3.1.x there is onsend_route to see outgoing
requests via $snd(...) variable.
But if you want to get the sip traffic going through kamailio,
better use siptrace module which stores requests/replies in database
table.
Cheers,
Daniel
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda