/**
 * @mainpage
 *
 * @see http://www.linphone.org
 *
 * @section what_is_it What is liblinphone
 *
 * Liblinphone is a high level library for bringing SIP video call functionnality
 * into an application. It aims at making easy the integration of the SIP
 * video calls into any applications. All variants of linphone are directly based
 * on it:
 * - linphone (gtk interface)
 *
 * - linphonec (console interface)
 *
 * Liblinphone is GPL (see COPYING file). Please understand the licencing details
 * before using it!
 * 
 * For any use of this library beyond the rights granted to you by the
 * GPL license, please contact Belledonne Communications 
 * (contact@belledonne-communications.com)
 * 
 *
**/

/**
 * @page liblinphone_license COPYING 
 * @verbinclude COPYING
 */

/**
 * @defgroup initializing Initializing liblinphone
**/

/**
 * @defgroup call_control Placing and receiving calls
**/

/**
 * @defgroup media_parameters Controlling media parameters
**/

/**
 * @defgroup proxies Managing proxies
 *User registration is controled by  #LinphoneProxyConfig settings.<br> Each #LinphoneProxyConfig object can be configured with registration informations 
 *like \link linphone_proxy_config_set_server_addr() proxy address \endlink , \link linphone_proxy_config_set_identity() user id \endlink, \link linphone_proxy_config_expires() refresh period \endlink, and so on. 
 *<br> A created proxy config using linphone_proxy_config_new(), once configured, must be added to #LinphoneCore using function linphone_core_add_proxy_config().
 *<br> It is recommended to set a default \link #LinphoneProxyConfig proxy config \endlink using function linphone_core_set_default_proxy(). Once done, if \link #LinphoneProxyConfig a proxy config \endlink has been configured with attribute \link linphone_proxy_config_enable_register() enable register \endlink  , next call to linphone_core_iterate() triggers a SIP register.  
 *<br> Registration status is reported by #LinphoneRegistrationStateCb.
 *<br>
 *<br> This pseudo code demonstrates basic registration operations:
 *<br> \code
 *	
 *	LinphoneProxyConfig* proxy_cfg;
 *	/*create proxy config*/
 *	proxy_cfg = linphone_proxy_config_new();
 *	/*parse identity*/
 *	LinphoneAddress *from = linphone_address_new("sip:toto@sip.titi.com");
 *	LinphoneAuthInfo *info;
 *	if (password!=NULL){
 * 		info=linphone_auth_info_new(linphone_address_get_username(from),NULL,"secret",NULL,NULL); /*create authentication structure from identity*/
 *		linphone_core_add_auth_info(lc,info); /*add authentication info to LinphoneCore*/
 *	}	
 *	// configure proxy entries
 *	linphone_proxy_config_set_identity(proxy_cfg,identity); /*set identity with user name and domain*/
 *	const char* server_addr = linphone_address_get_domain(from); /*extract domain address from identity*/
 *	linphone_proxy_config_set_server_addr(proxy_cfg,server_addr); /* we assume domain = proxy server address*/
 *	linphone_proxy_config_enable_register(proxy_cfg,TRUE); /*activate registration for this proxy config*/
 *	linphone_address_destroy(from); /*release resource*/
 *	
 *	linphone_core_add_proxy_config(lc,proxy_cfg); /*add proxy config to linphone core*/
 *	linphone_core_set_default_proxy(lc,proxy_cfg); /*set to default proxy*/ \endcode
 *<br>
 * Registration sate call back:
 \code
 static void registration_state_changed(struct _LinphoneCore *lc, LinphoneProxyConfig *cfg, LinphoneRegistrationState cstate, const char *message){
		printf("New registration state %s for user id [%s] at proxy [%s]\n"
				,linphone_registration_state_to_string(cstate)
				,linphone_proxy_config_get_identity(cfg)
				,linphone_proxy_config_get_addr(cfg));
}
 \endcode
 *<br><b>Authentication:</b>
 *<br>Most of the time, registration requires \ref authentication "authentication" to succed. #LinphoneAuthInfo info must be either added to #LinphoneCore  using function linphone_core_add_auth_info() before #LinphoneProxyConfig is added to Linphone core, or on demand from call back #AuthInfoRequested .    
 *<br>
 *<br><b>Unregistration:</b>
 *<br> Unregistration or any changes to #LinphoneProxyConfig must be first started by a call to function linphone_proxy_config_edit() and validated by  function linphone_proxy_config_done()
 *<br> This pseudo code shows how to unregister a user associated to a #LinphoneProxyConfig
 *\code
 	LinphoneProxyConfig* proxy_cfg;
 	linphone_core_get_default_proxy(lc,&proxy_cfg); /* get default proxy config*/
	linphone_proxy_config_edit(proxy_cfg); /*start editing proxy configuration*/
	linphone_proxy_config_enable_register(proxy_cfg,FALSE); /*de-activate registration for this proxy config*/
	linphone_proxy_config_done(proxy_cfg); /*initiate REGISTER with expire = 0*/
\endcode
	<br>
	A complete tutorial can be found at : \ref registration_tutorials "Registration tutorial" 
**/

/**
 * @defgroup network_parameters Controlling network parameters (ports, mtu...)
**/

/**
 * @defgroup authentication Managing authentication: userid and passwords
**/

/**
* @defgroup buddy_list Managing Buddies and buddy list and presence 
<b>Buddies and buddy list</b>
<br>Each buddy is represented by a #LinphoneFriend object created by function linphone_friend_new(). 
Buddy configuration parameters like \link linphone_friend_set_addr() sip uri \endlink or  \link linphone_friend_set_inc_subscribe_policy() status publication \endlink policy for this \link #LinphoneFriend friend \endlink  are configurable for each buddy.
<br>Here under a typical buddy creation:
<br>
\code
LinphoneFriend* my_friend=linphone_friend_new_with_addr("sip:joe@sip.linphone.org"); /*creates friend object for buddy joe*/
linphone_friend_enable_subscribes(my_friend,TRUE); /*configure this friend to emit SUBSCRIBE message after being added to LinphoneCore*/
linphone_friend_set_inc_subscribe_policy(my_friend,LinphoneSPAccept); /* accept Incoming subscription request for this friend*/
\endcode
\link #LinphoneFriend  friends \endlink status changes are reported by callback LinphoneCoreVTable.notify_presence_recv
\code
static void notify_presence_recv_updated (struct _LinphoneCore *lc,  LinphoneFriend *friend) {
	const LinphoneAddress* friend_address = linphone_friend_get_address(friend);
	printf("New state state [%s] for user id [%s] \n"
				,linphone_online_status_to_string(linphone_friend_get_status(friend))
				,linphone_address_as_string (friend_address));
}
\endcode
<br>Once created a buddy can be added to the buddy list using function linphone_core_add_friend() . Added friends will be notified about \link linphone_core_set_presence_info() local status changes \endlink
<br>
Any subsequente modifications to #LinphoneFriend must be first started by a call to function linphone_friend_edit() and validated by  function linphone_friend_done()
\code
linphone_friend_edit(my_friend); /* start editing friend */
linphone_friend_enable_subscribes(my_friend,FALSE); /*disable subscription for this friend*/
linphone_friend_done(my_friend); /*commit changes triggering an UNSUBSCRIBE message*/
\endcode


<b> Publishing presence status </b>
<br>Local presence status can be changed using function linphone_core_set_presence_info() .New status is propagated to all friends \link linphone_core_add_friend() previously added \endlink to #LinphoneCore. 

<b>Handling incoming subscription request</b>
<br> New incoming subscription requests are process according to \link linphone_friend_set_inc_subscribe_policy() the incoming subscription policy state \endlink for subscription initiated by \link linphone_core_add_friend() members of the buddy list. \endlink
<br> For incoming request comming from an unknown buddy, the call back  LinphoneCoreVTable.new_subscription_request is invoked.

<br> A complete tutorial can be found at : \ref buddy_tutorials "Registration tutorial" 


**/

/**
* @defgroup chatroom Chat room and Messaging 
<b> Exchanging text messages</b>
<br> Messages are sent using #LinphoneChatRoom object. First step is to create a \link linphone_core_create_chat_room() chat room \endlink
from a peer sip uri.
\code
LinphoneChatRoom* chat_room = linphone_core_create_chat_room(lc,"sip:joe@sip.linphone.org");
\endcode

<br>Once created, messages are sent using function linphone_chat_room_send_message()  . 
\code
linphone_chat_room_send_message(chat_room,"Hello world"); /*sending message*/
\endcode
<br>Incoming message are received from call back LinphoneCoreVTable.text_received
\code
void text_received(LinphoneCore *lc, LinphoneChatRoom *room, const LinphoneAddress *from, const char *message) {
	printf(" Message [%s] received from [%s] \n",message,linphone_address_as_string (from));
}
\endcode
<br> A complete tutorial can be found at : \ref chatroom_tuto "Chat room tutorial" 
**/

/**
 * @defgroup call_logs Managing call logs
**/


/**
 * @defgroup linphone_address SIP address parser API.
 * This api is useful for manipulating SIP addresses ('from' or 'to' headers).
**/

/**
 * @defgroup misc Miscenalleous: logs, version strings, config storage
**/

/**
 * @defgroup tutorials Tutorials: 
 *
**/