updated pjsip stack
There is still a bug on incoming calls when buiding for android
diff --git a/jni/pjproject-android/pjnath/docs/doc_nat.h b/jni/pjproject-android/pjnath/docs/doc_nat.h
index 1fdda7a..d4f71fe 100644
--- a/jni/pjproject-android/pjnath/docs/doc_nat.h
+++ b/jni/pjproject-android/pjnath/docs/doc_nat.h
@@ -1,4 +1,4 @@
-/* $Id: doc_nat.h 3553 2011-05-05 06:14:19Z nanang $ */
+/* $Id$ */
 /* 
  * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
  *