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diff --git a/pjsip/src/pjsip_mod_ua/sip_ua.h b/pjsip/src/pjsip_mod_ua/sip_ua.h
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+++ b/pjsip/src/pjsip_mod_ua/sip_ua.h
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+/* $Header: /pjproject/pjsip/src/pjsip_mod_ua/sip_ua.h 6     6/17/05 11:16p Bennylp $ */
+#ifndef __PJSIP_SIP_UA_H__
+#define __PJSIP_SIP_UA_H__
+
+/**
+ * @file ua.h
+ * @brief SIP User Agent Library
+ */
+
+#include <pjsip_mod_ua/sip_dialog.h>
+
+PJ_BEGIN_DECL
+
+/**
+ * @defgroup PJSUA SIP User Agent Stack
+ */
+
+/**
+ * @defgroup PJSUA_UA SIP User Agent
+ * @ingroup PJSUA
+ * @{
+ * \brief
+ *   User Agent manages the interactions between application and SIP dialogs.
+ */
+
+typedef struct pjsip_dlg_callback pjsip_dlg_callback;
+
+/**
+ * \brief This structure describes a User Agent instance.
+ */
+struct pjsip_user_agent
+{
+    pjsip_endpoint     *endpt;
+    pj_pool_t	       *pool;
+    pj_mutex_t	       *mutex;
+    pj_uint32_t		mod_id;
+    pj_hash_table_t    *dlg_table;
+    pjsip_dlg_callback *dlg_cb;
+    pj_list		dlg_list;
+};
+
+/**
+ * Create a new dialog.
+ */
+PJ_DECL(pjsip_dlg*) pjsip_ua_create_dialog( pjsip_user_agent *ua,
+					       pjsip_role_e role );
+
+
+/**
+ * Destroy dialog.
+ */
+PJ_DECL(void) pjsip_ua_destroy_dialog( pjsip_dlg *dlg );
+
+
+/** 
+ * Register callback to receive dialog notifications.
+ */
+PJ_DECL(void) pjsip_ua_set_dialog_callback( pjsip_user_agent *ua, 
+					    pjsip_dlg_callback *cb );
+
+
+/**
+ * Get the module interface for the UA module.
+ */
+PJ_DECL(pjsip_module*) pjsip_ua_get_module(void);
+
+
+/**
+ * Dump user agent state to log file.
+ */
+PJ_DECL(void) pjsip_ua_dump( pjsip_user_agent *ua );
+
+/**
+ * @}
+ */
+
+PJ_END_DECL
+
+#endif	/* __PJSIP_UA_H__ */
+