osip_nict_t *nict_context;  /**@internal */    osip_nist_t *nist_context;  /**@internal */	osip_srv_record_t record;   /**@internal */  };/** * Enumeration for callback type. */  typedef enum osip_message_callback_type  {    OSIP_ICT_INVITE_SENT = 0,               /**< INVITE MESSAGE SENT */    OSIP_ICT_INVITE_SENT_AGAIN,             /**< INVITE MESSAGE RETRANSMITTED */    OSIP_ICT_ACK_SENT,                      /**< ACK MESSAGE SENT */    OSIP_ICT_ACK_SENT_AGAIN,                /**< ACK MESSAGE RETRANSMITTED */    OSIP_ICT_STATUS_1XX_RECEIVED,           /**< 1XX FOR INVITE RECEIVED */    OSIP_ICT_STATUS_2XX_RECEIVED,           /**< 2XX FOR INVITE RECEIVED */    OSIP_ICT_STATUS_2XX_RECEIVED_AGAIN,     /**< 2XX FOR INVITE RECEIVED AGAIN */    OSIP_ICT_STATUS_3XX_RECEIVED,           /**< 3XX FOR INVITE RECEIVED */    OSIP_ICT_STATUS_4XX_RECEIVED,           /**< 4XX FOR INVITE RECEIVED */    OSIP_ICT_STATUS_5XX_RECEIVED,           /**< 5XX FOR INVITE RECEIVED */    OSIP_ICT_STATUS_6XX_RECEIVED,           /**< 6XX FOR INVITE RECEIVED */    OSIP_ICT_STATUS_3456XX_RECEIVED_AGAIN,  /**< RESPONSE RECEIVED AGAIN */    OSIP_IST_INVITE_RECEIVED,               /**< INVITE MESSAGE RECEIVED */    OSIP_IST_INVITE_RECEIVED_AGAIN,         /**< INVITE MESSAGE RECEIVED AGAN */    OSIP_IST_ACK_RECEIVED,                  /**< ACK MESSAGE RECEIVED */    OSIP_IST_ACK_RECEIVED_AGAIN,            /**< ACK MESSAGE RECEIVED AGAIN */    OSIP_IST_STATUS_1XX_SENT,               /**< 1XX FOR INVITE SENT */    OSIP_IST_STATUS_2XX_SENT,               /**< 2XX FOR INVITE SENT */    OSIP_IST_STATUS_2XX_SENT_AGAIN,         /**< 2XX FOR INVITE RETRANSMITTED */    OSIP_IST_STATUS_3XX_SENT,               /**< 3XX FOR INVITE SENT */    OSIP_IST_STATUS_4XX_SENT,               /**< 4XX FOR INVITE SENT */    OSIP_IST_STATUS_5XX_SENT,               /**< 5XX FOR INVITE SENT */    OSIP_IST_STATUS_6XX_SENT,               /**< 6XX FOR INVITE SENT */    OSIP_IST_STATUS_3456XX_SENT_AGAIN,      /**< RESPONSE RETRANSMITTED */    OSIP_NICT_REGISTER_SENT,                /**< REGISTER MESSAGE SENT */    OSIP_NICT_BYE_SENT,                     /**< BYE MESSAGE SENT */    OSIP_NICT_OPTIONS_SENT,                 /**< OPTIONS MESSAGE SENT */    OSIP_NICT_INFO_SENT,                    /**< INFO MESSAGE SENT */    OSIP_NICT_CANCEL_SENT,                  /**< CANCEL MESSAGE SENT */    OSIP_NICT_NOTIFY_SENT,                  /**< NOTIFY MESSAGE SENT */    OSIP_NICT_SUBSCRIBE_SENT,               /**< SUBSCRIBE MESSAGE SENT */    OSIP_NICT_UNKNOWN_REQUEST_SENT,         /**< UNKNOWN REQUEST MESSAGE SENT */    OSIP_NICT_REQUEST_SENT_AGAIN,           /**< REQUEST MESSAGE RETRANMITTED */    OSIP_NICT_STATUS_1XX_RECEIVED,          /**< 1XX FOR MESSAGE RECEIVED */    OSIP_NICT_STATUS_2XX_RECEIVED,          /**< 2XX FOR MESSAGE RECEIVED */    OSIP_NICT_STATUS_2XX_RECEIVED_AGAIN,    /**< 2XX FOR MESSAGE RECEIVED AGAIN */    OSIP_NICT_STATUS_3XX_RECEIVED,          /**< 3XX FOR MESSAGE RECEIVED */    OSIP_NICT_STATUS_4XX_RECEIVED,          /**< 4XX FOR MESSAGE RECEIVED */    OSIP_NICT_STATUS_5XX_RECEIVED,          /**< 5XX FOR MESSAGE RECEIVED */    OSIP_NICT_STATUS_6XX_RECEIVED,          /**< 6XX FOR MESSAGE RECEIVED */    OSIP_NICT_STATUS_3456XX_RECEIVED_AGAIN, /**< RESPONSE RECEIVED AGAIN */    OSIP_NIST_REGISTER_RECEIVED,            /**< REGISTER RECEIVED */    OSIP_NIST_BYE_RECEIVED,                 /**< BYE RECEIVED */    OSIP_NIST_OPTIONS_RECEIVED,             /**< OPTIONS RECEIVED */    OSIP_NIST_INFO_RECEIVED,                /**< INFO RECEIVED */    OSIP_NIST_CANCEL_RECEIVED,              /**< CANCEL RECEIVED */    OSIP_NIST_NOTIFY_RECEIVED,              /**< NOTIFY RECEIVED */    OSIP_NIST_SUBSCRIBE_RECEIVED,           /**< SUBSCRIBE RECEIVED */    OSIP_NIST_UNKNOWN_REQUEST_RECEIVED,     /**< UNKNWON REQUEST RECEIVED */    OSIP_NIST_REQUEST_RECEIVED_AGAIN,       /**< UNKNWON REQUEST RECEIVED AGAIN */    OSIP_NIST_STATUS_1XX_SENT,              /**< 1XX FOR MESSAGE SENT */    OSIP_NIST_STATUS_2XX_SENT,              /**< 2XX FOR MESSAGE SENT */    OSIP_NIST_STATUS_2XX_SENT_AGAIN,        /**< 2XX FOR MESSAGE RETRANSMITTED */    OSIP_NIST_STATUS_3XX_SENT,              /**< 3XX FOR MESSAGE SENT */    OSIP_NIST_STATUS_4XX_SENT,              /**< 4XX FOR MESSAGE SENT */    OSIP_NIST_STATUS_5XX_SENT,              /**< 5XX FOR MESSAGE SENT */    OSIP_NIST_STATUS_6XX_SENT,              /**< 6XX FOR MESSAGE SENT */    OSIP_NIST_STATUS_3456XX_SENT_AGAIN,     /**< RESPONSE RETRANSMITTED */    OSIP_ICT_STATUS_TIMEOUT,                /**< TIMER B EXPIRATION: NO REMOTE ANSWER  */    OSIP_NICT_STATUS_TIMEOUT,               /**< TIMER F EXPIRATION: NO REMOTE ANSWER  */    OSIP_MESSAGE_CALLBACK_COUNT             /**< END OF ENUM */  } osip_message_callback_type_t;/** * Enumeration for callback type used when transaction is over. */  typedef enum osip_kill_callback_type  {    OSIP_ICT_KILL_TRANSACTION,      /**< end of Client INVITE transaction */    OSIP_IST_KILL_TRANSACTION,      /**< end of Server INVITE transaction */    OSIP_NICT_KILL_TRANSACTION,     /**< end of Client Non-INVITE transaction */    OSIP_NIST_KILL_TRANSACTION,     /**< end of Server Non-INVITE transaction */    OSIP_KILL_CALLBACK_COUNT        /**< END OF ENUM */  } osip_kill_callback_type_t;/** * Enumeration for callback type used when a transport error is detected. * @var osip_transport_error_callback_type_t */  typedef enum osip_transport_error_callback_type  {    OSIP_ICT_TRANSPORT_ERROR,             /**< transport error for ICT */    OSIP_IST_TRANSPORT_ERROR,             /**< transport error for IST */    OSIP_NICT_TRANSPORT_ERROR,            /**< transport error for NICT */    OSIP_NIST_TRANSPORT_ERROR,            /**< transport error for NIST */    OSIP_TRANSPORT_ERROR_CALLBACK_COUNT   /**< END OF ENUM */  } osip_transport_error_callback_type_t;/** * Callback definition for message announcements. * @var osip_message_cb_t */  typedef void (*osip_message_cb_t) (int type, osip_transaction_t *,                                     osip_message_t *);/** * Callback definition for end of transaction announcements. * @var osip_kill_transaction_cb_t */  typedef void (*osip_kill_transaction_cb_t) (int type, osip_transaction_t *);/** * Callback definition for transport error announcements. * @var osip_transport_error_cb_t */  typedef void (*osip_transport_error_cb_t) (int type, osip_transaction_t *,                                             int error);  struct osip_dialog;/** * Structure for 2XX retransmission management. * @var ixt_t */  typedef struct ixt_t ixt_t;/** * Structure for 2XX retransmission management. * @struct ixt */  struct ixt_t  {    /* any ACK received that match this context will set counter to -1 */    struct osip_dialog *dialog; /**< related dialog */    osip_message_t *msg2xx;     /**< buffer to retransmit */    osip_message_t *ack;        /**< ack message if needed */    struct timeval start;       /**< Time of first retransmission */    int interval;               /**< delay between retransmission, in ms */    char *dest;                 /**< destination host */    int port;                   /**< destination port */    int sock;                   /**< socket to use */    int counter;                /**< start at 7 */  };/** * Structure for osip handling. * In order to use osip, you have to manage at least one global instance * of an osip_t element. Then, you'll register a set of required callbacks * and a set of optional ones. * @var osip_t */  typedef struct osip osip_t;/** * Structure for osip handling. * @struct osip */  struct osip  {    void *application_context;  /**< User defined Pointer */    /* list of transactions for ict, ist, nict, nist */    osip_list_t osip_ict_transactions;   /**< list of ict transactions */    osip_list_t osip_ist_transactions;   /**< list of ist transactions */    osip_list_t osip_nict_transactions;  /**< list of nict transactions */    osip_list_t osip_nist_transactions;  /**< list of nist transactions */    osip_list_t ixt_retransmissions;    /**< list of ixt elements */    osip_message_cb_t msg_callbacks[OSIP_MESSAGE_CALLBACK_COUNT];        /**@internal */    osip_kill_transaction_cb_t kill_callbacks[OSIP_KILL_CALLBACK_COUNT]; /**@internal */    osip_transport_error_cb_t tp_error_callbacks[OSIP_TRANSPORT_ERROR_CALLBACK_COUNT];  /**@internal */    int (*cb_send_message) (osip_transaction_t *, osip_message_t *, char *,                            int, int);                                        /**@internal */#if defined(HAVE_DICT_DICT_H)    dict *osip_ict_hastable;              /**< htable of ict transactions */    dict *osip_ist_hastable;              /**< htable of ist transactions */    dict *osip_nict_hastable;             /**< htable of nict transactions */    dict *osip_nist_hastable;             /**< htable of nist transactions */#endif  };/** * Set a callback for each transaction operation.  * @param osip The element to work on. * @param type The event type to hook on. * @param cb The method to be called upon the event. */  int osip_set_message_callback (osip_t * osip, int type, osip_message_cb_t cb);/** * Set a callback for transaction operation related to the end of transactions.  * @param osip The element to work on. * @param type The event type to hook on. * @param cb The method to be called upon the event. */  int osip_set_kill_transaction_callback (osip_t * osip, int type,                                          osip_kill_transaction_cb_t cb);/** * Set a callback for each transaction operation related to network error. * @param osip The element to work on. * @param type The event type to hook on. * @param cb The method to be called upon the event. */  int osip_set_transport_error_callback (osip_t * osip, int type,                                         osip_transport_error_cb_t cb);/** * Structure for osip event handling. * A osip_event_t element will have a type and will be related * to a transaction. In the general case, it is used by the * application layer to give SIP messages to the oSIP finite * state machine. * @var osip_event_t */  typedef struct osip_event osip_event_t;/** * Structure for osip event handling. * @struct osip_event */  struct osip_event  {    type_t type;             /**< Event Type */    int transactionid;       /**< identifier of the related osip transaction */    osip_message_t *sip;     /**< SIP message (optional) */  };/** * Allocate an osip_transaction_t element. * @param transaction The element to allocate. * @param ctx_type The type of transaction. (ICT, IST, NICT, NIST) * @param osip The global instance of oSIP. * @param request The SIP request that initiate the transaction. */  int osip_transaction_init (osip_transaction_t ** transaction,                             osip_fsm_type_t ctx_type, osip_t * osip,                             osip_message_t * request);/** * Free all resource in a osip_transaction_t element. * @param transaction The element to free. */  int osip_transaction_free (osip_transaction_t * transaction);/** * Free all resource in a osip_transaction_t element. * This method does the same than osip_transaction_free() but it assumes * that the transaction is already removed from the list of transaction * in the osip stack. (to remove it use osip_xixt_remove(osip, transaction); * @param transaction The element to free. */  int osip_transaction_free2 (osip_transaction_t * transaction);/** * Search in a SIP response the destination where the message * should be sent. * @param response the message to work on. * @param address a pointer to receive the allocated host address. * @param portnum a pointer to receive the host port. */  void osip_response_get_destination (osip_message_t * response,                                      char **address, int *portnum);/** * Set the host and port destination used for sending the SIP message. * This can be useful for an application with 'DIRECT ROOTING MODE' * NOTE: Instead, you should use the 'Route' header facility which * leads to the same behaviour. * @param ict The element to work on. * @param destination The destination host. * @param port The destination port. */  int osip_ict_set_destination (osip_ict_t * ict, char *destination, int port);/** * Set the host and port destination used for sending the SIP message. * This can be useful for an application with 'DIRECT ROOTING MODE' * NOTE: Instead, you should use the 'Route' header facility which * leads to the same behaviour. * @param nict The element to work on. * @param destination The destination host. * @param port The destination port. */  int osip_nict_set_destination (osip_nict_t * nict, char *destination, int port);/** * Add a SIP event in the fifo of a osip_transaction_t element. * @param transaction The element to work on. * @param evt The event to add. */  int osip_transaction_add_event (osip_transaction_t * transaction,                                  osip_event_t * evt);/** * Consume one osip_event_t element previously added in the fifo. * NOTE: This method MUST NEVER be called within another call * of this method. (For example, you can't call osip_transaction_execute() * in a callback registered in the osip_t element.) * @param transaction The element to free. * @param evt The element to consume. */  int osip_transaction_execute (osip_transaction_t * transaction,                                osip_event_t * evt);/** * Set a pointer to your personal context associated with this transaction. * NOTE: this is a very useful method that allow you to avoid searching * for your personal context inside the registered callbacks. * You can initialise this pointer to your context right after * the creation of the osip_transaction_t element. Then, you'll be * able to get the address of your context by calling * osip_transaction_get_your_instance(). * @param transaction The element to work on. * @param instance The address of your context. */  int osip_transaction_set_your_instance (osip_transaction_t * transaction,                                          void *instance);/** * Get a pointer to your personal context associated with this transaction. * @param transaction The element to work on. */  void *osip_transaction_get_your_instance (osip_transaction_t * transaction);/** * Get target ip and port for this request. * (automaticly set by osip_transaction_init() for ict and nict) * @param transaction The element to work on. * @param ip The ip of host where to send initial request. * @param port The port where to send initial request. */  int osip_transaction_get_destination (osip_transaction_t * transaction,                                        char **ip, int *port);/** * Set SRV lookup information to be used by state machine. * * @param transaction The element to work on. * @param record The SRV lookup results for this transaction. */  int osip_transaction_set_srv_record(osip_transaction_t *transaction, osip_srv_record_t *record);