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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2009 Teluu Inc. (http://www.teluu.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJSIP_SIMPLE_MWI_H__
+#define __PJSIP_SIMPLE_MWI_H__
+
+/**
+ * @file mwi.h
+ * @brief SIP Extension for MWI (RFC 3842)
+ */
+#include <pjsip-simple/evsub.h>
+#include <pjsip/sip_msg.h>
+
+
+PJ_BEGIN_DECL
+
+
+/**
+ * @defgroup mwi SIP Message Summary and Message Waiting Indication (RFC 3842)
+ * @ingroup PJSIP_SIMPLE
+ * @brief Support for SIP MWI Extension (RFC 3842)
+ * @{
+ *
+ * This module implements RFC 3842: A Message Summary and Message Waiting
+ * Indication Event Package for the Session Initiation Protocol (SIP).
+ * It uses the SIP Event Notification framework (evsub.h) and extends the 
+ * framework by implementing "message-summary" event package.
+ */
+
+
+/**
+ * Initialize the MWI module and register it as endpoint module and
+ * package to the event subscription module.
+ *
+ * @param endpt		The endpoint instance.
+ * @param mod_evsub	The event subscription module instance.
+ *
+ * @return		PJ_SUCCESS if the module is successfully 
+ *			initialized and registered to both endpoint
+ *			and the event subscription module.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_init_module(pjsip_endpoint *endpt,
+					   pjsip_module *mod_evsub);
+
+/**
+ * Get the MWI module instance.
+ *
+ * @return		The MWI module instance.
+ */
+PJ_DECL(pjsip_module*) pjsip_mwi_instance(void);
+
+/**
+ * Create MWI client subscription session.
+ *
+ * @param dlg		The underlying dialog to use.
+ * @param user_cb	Pointer to callbacks to receive MWI subscription
+ *			events.
+ * @param options	Option flags. Currently only PJSIP_EVSUB_NO_EVENT_ID
+ *			is recognized.
+ * @param p_evsub	Pointer to receive the MWI subscription
+ *			session.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_create_uac( pjsip_dialog *dlg,
+					   const pjsip_evsub_user *user_cb,
+					   unsigned options,
+					   pjsip_evsub **p_evsub );
+
+/**
+ * Create MWI server subscription session.
+ *
+ * @param dlg		The underlying dialog to use.
+ * @param user_cb	Pointer to callbacks to receive MWI subscription
+ *			events.
+ * @param rdata		The incoming SUBSCRIBE request that creates the event 
+ *			subscription.
+ * @param p_evsub	Pointer to receive the MWI subscription
+ *			session.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_create_uas( pjsip_dialog *dlg,
+					   const pjsip_evsub_user *user_cb,
+					   pjsip_rx_data *rdata,
+					   pjsip_evsub **p_evsub );
+
+/**
+ * Forcefully destroy the MWI subscription. This function should only
+ * be called on special condition, such as when the subscription 
+ * initialization has failed. For other conditions, application MUST terminate
+ * the subscription by sending the appropriate un(SUBSCRIBE) or NOTIFY.
+ *
+ * @param sub		The MWI subscription.
+ * @param notify	Specify whether the state notification callback
+ *			should be called.
+ *
+ * @return		PJ_SUCCESS if subscription session has been destroyed.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_terminate( pjsip_evsub *sub,
+					  pj_bool_t notify );
+
+/**
+ * Call this function to create request to initiate MWI subscription, to 
+ * refresh subcription, or to request subscription termination.
+ *
+ * @param sub		Client subscription instance.
+ * @param expires	Subscription expiration. If the value is set to zero,
+ *			this will request unsubscription.
+ * @param p_tdata	Pointer to receive the request.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_initiate( pjsip_evsub *sub,
+					 pj_int32_t expires,
+					 pjsip_tx_data **p_tdata);
+
+/**
+ * Accept the incoming subscription request by sending 2xx response to
+ * incoming SUBSCRIBE request.
+ *
+ * @param sub		Server subscription instance.
+ * @param rdata		The incoming subscription request message.
+ * @param st_code	Status code, which MUST be final response.
+ * @param hdr_list	Optional list of headers to be added in the response.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_accept( pjsip_evsub *sub,
+				       pjsip_rx_data *rdata,
+				       int st_code,
+				       const pjsip_hdr *hdr_list );
+
+/**
+ * For notifier, create NOTIFY request to subscriber, and set the state 
+ * of the subscription. 
+ *
+ * @param sub		The server subscription (notifier) instance.
+ * @param state		New state to set.
+ * @param state_str	The state string name, if state contains value other
+ *			than active, pending, or terminated. Otherwise this
+ *			argument is ignored.
+ * @param reason	Specify reason if new state is terminated, otherwise
+ *			put NULL.
+ * @param mime_type	MIME type/content type of the message body.
+ * @param body		Message body to be included in the NOTIFY request.
+ * @param p_tdata	Pointer to receive the request.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_notify( pjsip_evsub *sub,
+				       pjsip_evsub_state state,
+				       const pj_str_t *state_str,
+				       const pj_str_t *reason,
+				       const pjsip_media_type *mime_type,
+				       const pj_str_t *body,
+				       pjsip_tx_data **p_tdata);
+
+/**
+ * Create NOTIFY request containing message body from the last NOITFY
+ * message created.
+ *
+ * @param sub		Server subscription object.
+ * @param p_tdata	Pointer to receive request.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_current_notify( pjsip_evsub *sub,
+					       pjsip_tx_data **p_tdata );
+
+
+/**
+ * Send request message that was previously created with initiate(), notify(),
+ * or current_notify(). Application may also send request created with other
+ * functions, e.g. authentication. But the request MUST be either request
+ * that creates/refresh subscription or NOTIFY request.
+ *
+ * @param sub		The subscription object.
+ * @param tdata		Request message to be sent.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_mwi_send_request( pjsip_evsub *sub,
+					     pjsip_tx_data *tdata );
+
+/**
+ * @}
+ */
+
+PJ_END_DECL
+
+
+#endif	/* __PJSIP_SIMPLE_MWI_H__ */