--- configs/sip.conf.sample.orig	2011-10-01 01:34:53.000000000 +0200
+++ configs/sip.conf.sample	2011-10-01 01:38:47.000000000 +0200
@@ -808,6 +808,8 @@
 ;        nat = force_rport       ; Force rport to always be on.
 ;        nat = yes               ; Force rport to always be on and perform comedia RTP handling.
 ;        nat = comedia           ; Use rport if the remote side says to use it and perform comedia RTP handling.
+;        nat = auto              ; [Experimental] Auto detect nat in several peer scenarios.
+;                                ; Auto nat detection must be set globally to work, but can be overriden per peer.
 ;
 ; 'comedia RTP handling' refers to the technique of sending RTP to the port that the
 ; the other endpoint's RTP arrived from, and means 'connection-oriented media'. This is