Modifications all over the place, but mainly only to update Doxygen documentation

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@515 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/include/pjsip-ua/sip_xfer.h b/pjsip/include/pjsip-ua/sip_xfer.h
index 16eb195..5680914 100644
--- a/pjsip/include/pjsip-ua/sip_xfer.h
+++ b/pjsip/include/pjsip-ua/sip_xfer.h
@@ -28,6 +28,19 @@
 #include <pjsip-simple/evsub.h>
 #include <pjsip/sip_msg.h>
 
+/**
+ * @defgroup PJSUA_XFER Call Transfer
+ * @ingroup PJSIP_HIGH_UA
+ * @brief Provides call transfer functionality.
+ * @{
+ *
+ * This implements call transfer functionality to INVITE sessions. The call
+ * transfer functionality uses SIP Event Subscription framework for
+ * managing call transfer status.
+ *
+ * Application must link with <b>pjsip-ua</b> AND <b>pjsip-simple</b> static
+ * libraries to use call transfer functionality.
+ */
 
 
 PJ_BEGIN_DECL
@@ -168,8 +181,11 @@
 					      pjsip_tx_data *tdata);
 
 
-
 PJ_END_DECL
 
+/**
+ * @}
+ */
+
 #endif	/* __PJSIP_XFER_H__ */