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/usr/include/eXosip2/eX_register.h is in libexosip2-dev 4.1.0-2.1.

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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 __EX_REGISTER_H__
#define __EX_REGISTER_H__

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

#ifdef __cplusplus
extern "C" {
#endif


/**
 * @file eX_register.h
 * @brief eXosip registration API
 *
 * This file provide the API needed to control registrations. You can
 * use it to:
 *
 * <ul>
 * <li>build initial REGISTER.</li>
 * <li>build REGISTER.</li>
 * <li>send REGISTER.</li>
 * </ul>
 */

/**
 * @defgroup eXosip2_registration eXosip2 REGISTER and Registration Management
 * @ingroup eXosip2_msg
 * @{
 */

  struct eXosip_reg_t;

/**
 * Build initial REGISTER request.
 * 
 * @param excontext    eXosip_t instance.
 * @param from      SIP url for caller.
 * @param proxy     Proxy used for registration.
 * @param contact   Contact address. (optional)
 * @param expires   The expires value for registration.
 * @param reg       The SIP request to build.
 */
  int eXosip_register_build_initial_register (struct eXosip_t *excontext, const char *from, const char *proxy, const char *contact, int expires, osip_message_t ** reg);

/**
 * Build initial REGISTER request with qvalue for contact.
 * 
 * @param excontext    eXosip_t instance.
 * @param from      SIP url for caller.
 * @param proxy     Proxy used for registration.
 * @param contact   Contact address. (optional)
 * @param expires   The expires value for registration.
 * @param qvalue    The qvalue value for contact header.
 * @param reg       The SIP request to build.
 */
  int eXosip_register_build_initial_register_withqvalue (struct eXosip_t *excontext, const char *from, const char *proxy, const char *contact, int expires, const char *qvalue, osip_message_t ** reg);

/**
 * Build a new REGISTER request for an existing registration.
 * 
 * @param excontext    eXosip_t instance.
 * @param rid       A unique identifier for the registration context
 * @param expires   The expires value for registration.
 * @param reg       The SIP request to build.
 */
  int eXosip_register_build_register (struct eXosip_t *excontext, int rid, int expires, osip_message_t ** reg);

/**
 * Send a REGISTER request for an existing registration.
 * 
 * @param excontext    eXosip_t instance.
 * @param rid       A unique identifier for the registration context
 * @param reg       The SIP request to build. (NULL for default REGISTER)
 */
  int eXosip_register_send_register (struct eXosip_t *excontext, int rid, osip_message_t * reg);

/**
 * Remove existing registration without sending REGISTER.
 * 
 * @param excontext    eXosip_t instance.
 * @param rid       A unique identifier for the registration context
 */
  int eXosip_register_remove (struct eXosip_t *excontext, int rid);

/** @} */


#ifdef __cplusplus
}
#endif
#endif