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/usr/include/eXosip2/eX_refer.h is in libexosip2-dev 4.1.0-2.2~build1.

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/*
  eXosip - This is the eXtended osip library.
  Copyright (C) 2001-2012 Aymeric MOIZARD amoizard@antisip.com
  
  eXosip 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.
  
  eXosip 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

  In addition, as a special exception, the copyright holders give
  permission to link the code of portions of this program with the
  OpenSSL library under certain conditions as described in each
  individual source file, and distribute linked combinations
  including the two.
  You must obey the GNU General Public License in all respects
  for all of the code used other than OpenSSL.  If you modify
  file(s) with this exception, you may extend this exception to your
  version of the file(s), but you are not obligated to do so.  If you
  do not wish to do so, delete this exception statement from your
  version.  If you delete this exception statement from all source
  files in the program, then also delete it here.
*/


#ifdef ENABLE_MPATROL
#include <mpatrol.h>
#endif

#ifndef MINISIZE

#ifndef __EX_REFER_H__
#define __EX_REFER_H__

#include <osipparser2/osip_parser.h>
#include <time.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @file eX_refer.h
 * @brief eXosip transfer outside of calls API
 *
 * This file provide the API needed to request a blind transfer
 * outside of any call.
 *
 * <ul>
 * <li>build initial refer.</li>
 * <li>send initial refer.</li>
 * </ul>
 *
 */

/**
 * @defgroup eXosip2_refer eXosip2 REFER and blind tranfer Management outside of calls
 * @ingroup eXosip2_msg
 * @{
 */

/**
 * Build a default REFER message for a blind transfer outside of any calls.
 * 
 * @param excontext    eXosip_t instance.
 * @param refer     Pointer for the SIP element to hold.
 * @param refer_to  SIP url for transfer.
 * @param from      SIP url for caller.
 * @param to        SIP url for callee.
 * @param route     Route header for REFER. (optional)
 */
  int eXosip_refer_build_request (struct eXosip_t *excontext, osip_message_t ** refer, const char *refer_to, const char *from, const char *to, const char *route);

/**
 * Initiate a blind tranfer outside of any call.
 * 
 * @param excontext    eXosip_t instance.
 * @param refer     SIP REFER message to send.
 */
  int eXosip_refer_send_request (struct eXosip_t *excontext, osip_message_t * refer);

/** @} */


#ifdef __cplusplus
}
#endif
#endif
#endif