[Freeswitch-users] How to turn on debug output just before 'New Channel sofia/...' ?

What turns on debugging info that shows where a new call from a local extension to FS gets assigned to one of FS's sip profiles? The bit that comes after the sip traces but before "switch_channel.c:1034 New Channel sofia/...." I need to get more debugging info that connects an ip and port with an 'invite' to a FS sip profile. Because in my case the profile FS comes up with (external) has nothing to do with the port the invite from the registered phone actually came in on (internal). Thanks!