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964 lines
35 KiB
964 lines
35 KiB
/* $Id$ */
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/*
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __SIP_INVITE_SESSION_H__
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#define __SIP_INVITE_SESSION_H__
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/**
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* @file sip_inv.h
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* @brief INVITE sessions
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*/
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#include <pjsip/sip_dialog.h>
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#include <pjmedia/sdp_neg.h>
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/**
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* @defgroup PJSIP_HIGH_UA User Agent Library
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* @brief Mid-level User Agent Library.
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*
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* This is the high level user agent library, which consists of:
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* - @ref PJSIP_INV, to encapsulate INVITE sessions and SDP
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* negotiation in the session,
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* - @ref PJSUA_REGC, high level client registration API, and
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* - @ref PJSUA_XFER.
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*
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* More detailed information is explained in
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* <A HREF="/docs.htm">PJSIP Developer's Guide</A>
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* PDF document, and readers are encouraged to read the document to
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* get the concept behind dialog, dialog usages, and INVITE sessions.
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*
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* The User Agent Library is implemented in <b>pjsip-ua</b> static
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* library.
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*/
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/**
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* @defgroup PJSIP_INV INVITE Session
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* @ingroup PJSIP_HIGH_UA
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* @brief Provides INVITE session management.
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* @{
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*
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* The INVITE session uses the @ref PJSIP_DIALOG framework to manage
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* the underlying dialog, and is one type of usages that can use
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* a particular dialog instance (other usages are event subscription,
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* discussed in @ref PJSIP_EVENT_NOT). The INVITE session manages
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* the life-time of the session, and also manages the SDP negotiation.
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*
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* Application must link with <b>pjsip-ua</b> static library to use this API.
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*
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* More detailed information is explained in
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* <A HREF="/docs.htm">PJSIP Developer's Guide</A>
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* PDF document, and readers are encouraged to read the document to
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* get the concept behind dialog, dialog usages, and INVITE sessions.
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*
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* The INVITE session does NOT manage media. If application wants to
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* use API that encapsulates both signaling and media in a very easy
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* to use API, it can use @ref PJSUA_LIB for this purpose.
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*/
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PJ_BEGIN_DECL
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/**
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* @see pjsip_inv_session
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*/
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typedef struct pjsip_inv_session pjsip_inv_session;
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/**
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* This enumeration describes invite session state.
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*/
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typedef enum pjsip_inv_state
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{
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PJSIP_INV_STATE_NULL, /**< Before INVITE is sent or received */
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PJSIP_INV_STATE_CALLING, /**< After INVITE is sent */
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PJSIP_INV_STATE_INCOMING, /**< After INVITE is received. */
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PJSIP_INV_STATE_EARLY, /**< After response with To tag. */
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PJSIP_INV_STATE_CONNECTING, /**< After 2xx is sent/received. */
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PJSIP_INV_STATE_CONFIRMED, /**< After ACK is sent/received. */
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PJSIP_INV_STATE_DISCONNECTED, /**< Session is terminated. */
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} pjsip_inv_state;
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/**
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* This structure contains callbacks to be registered by application to
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* receieve notifications from the framework about various events in
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* the invite session.
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*/
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typedef struct pjsip_inv_callback
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{
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/**
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* This callback is called when the invite sesion state has changed.
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* Application should inspect the session state (inv_sess->state) to get
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* the current state of the session.
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*
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* This callback is mandatory.
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*
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* @param inv The invite session.
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* @param e The event which has caused the invite session's
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* state to change.
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*/
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void (*on_state_changed)(pjsip_inv_session *inv, pjsip_event *e);
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/**
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* This callback is called when the invite usage module has created
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* a new dialog and invite because of forked outgoing request.
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*
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* This callback is mandatory.
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*
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* @param inv The new invite session.
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* @param e The event which has caused the dialog to fork.
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* The type of this event can be either
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* PJSIP_EVENT_RX_MSG or PJSIP_EVENT_RX_200_MSG.
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*/
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void (*on_new_session)(pjsip_inv_session *inv, pjsip_event *e);
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/**
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* This callback is called whenever any transactions within the session
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* has changed their state. Application MAY implement this callback,
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* e.g. to monitor the progress of an outgoing request, or to send
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* response to unhandled incoming request (such as INFO).
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*
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* This callback is optional.
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*
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* @param inv The invite session.
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* @param tsx The transaction, which state has changed.
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* @param e The event which has caused the transation state's
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* to change.
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*/
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void (*on_tsx_state_changed)(pjsip_inv_session *inv,
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pjsip_transaction *tsx,
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pjsip_event *e);
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/**
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* This callback is called when the invite session has received
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* new offer from peer. Application can inspect the remote offer
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* in "offer", and set the SDP answer with #pjsip_inv_set_sdp_answer().
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* When the application sends a SIP message to send the answer,
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* this SDP answer will be negotiated with the offer, and the result
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* will be sent with the SIP message.
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*
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* @param inv The invite session.
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* @param offer Remote offer.
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*/
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void (*on_rx_offer)(pjsip_inv_session *inv,
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const pjmedia_sdp_session *offer);
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/**
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* This callback is optional, and it is used to ask the application
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* to create a fresh offer, when the invite session has received
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* re-INVITE without offer. This offer then will be sent in the
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* 200/OK response to the re-INVITE request.
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*
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* If application doesn't implement this callback, the invite session
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* will send the currently active SDP as the offer.
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*
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* @param inv The invite session.
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* @param p_offer Pointer to receive the SDP offer created by
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* application.
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*/
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void (*on_create_offer)(pjsip_inv_session *inv,
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pjmedia_sdp_session **p_offer);
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/**
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* This callback is called after SDP offer/answer session has completed.
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* The status argument specifies the status of the offer/answer,
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* as returned by pjmedia_sdp_neg_negotiate().
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*
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* This callback is optional (from the point of view of the framework),
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* but all useful applications normally need to implement this callback.
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*
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* @param inv The invite session.
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* @param status The negotiation status.
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*/
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void (*on_media_update)(pjsip_inv_session *inv_ses,
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pj_status_t status);
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/**
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* This callback is called when the framework needs to send
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* ACK request after it receives incoming 2xx response for
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* INVITE. It allows application to manually handle the
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* transmission of ACK request, which is required by some 3PCC
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* scenarios. If this callback is not implemented, the framework
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* will handle the ACK transmission automatically.
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*
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* When this callback is overridden, application may delay the
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* sending of the ACK request (for example, when it needs to
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* wait for answer from the other call leg, in 3PCC scenarios).
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*
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* Application creates the ACK request
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*
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* Once it has sent the ACK request, the framework will keep
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* this ACK request in the cache. Subsequent receipt of 2xx response
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* will not cause this callback to be called, and instead automatic
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* retransmission of this ACK request from the cache will be done
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* by the framework.
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*
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* This callback is optional.
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*/
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void (*on_send_ack)(pjsip_inv_session *inv, pjsip_rx_data *rdata);
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/**
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* This callback is called when the session is about to resend the
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* INVITE request to the specified target, following the previously
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* received redirection response.
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*
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* Application may accept the redirection to the specified target
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* (the default behavior if this callback is implemented), reject
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* this target only and make the session continue to try the next
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* target in the list if such target exists, stop the whole
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* redirection process altogether and cause the session to be
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* disconnected, or defer the decision to ask for user confirmation.
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*
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* This callback is optional. If this callback is not implemented,
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* the default behavior is to NOT follow the redirection response.
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*
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* @param inv The invite session.
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* @param target The current target to be tried.
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* @param e The event that caused this callback to be called.
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* This could be the receipt of 3xx response, or
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* 4xx/5xx response received for the INVITE sent to
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* subsequent targets, or NULL if this callback is
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* called from within #pjsip_inv_process_redirect()
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* context.
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*
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* @return Action to be performed for the target. Set this
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* parameter to one of the value below:
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* - PJSIP_REDIRECT_ACCEPT: immediately accept the
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* redirection to this target. When set, the
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* session will immediately resend INVITE request
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* to the target after this callback returns.
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* - PJSIP_REDIRECT_REJECT: immediately reject this
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* target. The session will continue retrying with
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* next target if present, or disconnect the call
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* if there is no more target to try.
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* - PJSIP_REDIRECT_STOP: stop the whole redirection
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* process and immediately disconnect the call. The
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* on_state_changed() callback will be called with
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* PJSIP_INV_STATE_DISCONNECTED state immediately
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* after this callback returns.
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* - PJSIP_REDIRECT_PENDING: set to this value if
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* no decision can be made immediately (for example
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* to request confirmation from user). Application
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* then MUST call #pjsip_inv_process_redirect()
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* to either accept or reject the redirection upon
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* getting user decision.
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*/
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pjsip_redirect_op (*on_redirected)(pjsip_inv_session *inv,
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const pjsip_uri *target,
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const pjsip_event *e);
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} pjsip_inv_callback;
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/**
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* This enumeration shows various options that can be applied to a session.
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* The bitmask combination of these options need to be specified when
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* creating a session. After the dialog is established (including early),
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* the options member of #pjsip_inv_session shows which capabilities are
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* common in both endpoints.
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*/
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enum pjsip_inv_option
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{
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/**
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* Indicate support for reliable provisional response extension
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*/
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PJSIP_INV_SUPPORT_100REL = 1,
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/**
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* Indicate support for session timer extension.
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*/
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PJSIP_INV_SUPPORT_TIMER = 2,
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/**
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* Indicate support for UPDATE method. This is automatically implied
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* when creating outgoing dialog. After the dialog is established,
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* the options member of #pjsip_inv_session shows whether peer supports
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* this method as well.
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*/
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PJSIP_INV_SUPPORT_UPDATE = 4,
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/**
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* Indicate support for ICE
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*/
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PJSIP_INV_SUPPORT_ICE = 8,
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/**
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* Require ICE support.
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*/
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PJSIP_INV_REQUIRE_ICE = 16,
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/**
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* Require reliable provisional response extension.
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*/
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PJSIP_INV_REQUIRE_100REL = 32,
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/**
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* Require session timer extension.
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*/
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PJSIP_INV_REQUIRE_TIMER = 64,
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/**
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* Session timer extension will always be used even when peer doesn't
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* support/want session timer.
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*/
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PJSIP_INV_ALWAYS_USE_TIMER = 128
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};
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/* Forward declaration of Session Timers */
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struct pjsip_timer;
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/**
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* This structure describes the invite session.
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*
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* Note regarding the invite session's pools. The inv_sess used to have
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* only one pool, which is just a pointer to the dialog's pool. Ticket
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* http://trac.pjsip.org/repos/ticket/877 has found that the memory
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* usage will grow considerably everytime re-INVITE or UPDATE is
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* performed.
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*
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* Ticket #877 then created two more memory pools for the inv_sess, so
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* now we have three memory pools:
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* - pool: to be used to allocate long term data for the session
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* - pool_prov and pool_active: this is a flip-flop pools to be used
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* interchangably during re-INVITE and UPDATE. pool_prov is
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* "provisional" pool, used to allocate SDP offer or answer for
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* the re-INVITE and UPDATE. Once SDP negotiation is done, the
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* provisional pool will be made as the active pool, then the
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* existing active pool will be reset, to release the memory
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* back to the OS. So these pool's lifetime is synchronized to
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* the SDP offer-answer negotiation.
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*
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* Higher level application such as PJSUA-LIB has been modified to
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* make use of these flip-flop pools, i.e. by creating media objects
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* from the provisional pool rather than from the long term pool.
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*
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* Other applications that want to use these pools must understand
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* that the flip-flop pool's lifetimes are synchronized to the
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* SDP offer-answer negotiation.
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*/
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struct pjsip_inv_session
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{
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char obj_name[PJ_MAX_OBJ_NAME]; /**< Log identification */
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pj_pool_t *pool; /**< Long term pool. */
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pj_pool_t *pool_prov; /**< Provisional pool */
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pj_pool_t *pool_active; /**< Active/current pool*/
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pjsip_inv_state state; /**< Invite sess state. */
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pj_bool_t cancelling; /**< CANCEL requested */
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pj_bool_t pending_cancel; /**< Wait to send CANCEL*/
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pjsip_status_code cause; /**< Disconnect cause. */
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pj_str_t cause_text; /**< Cause text. */
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pj_bool_t notify; /**< Internal. */
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unsigned cb_called; /**< Cb has been called */
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pjsip_dialog *dlg; /**< Underlying dialog. */
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pjsip_role_e role; /**< Invite role. */
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unsigned options; /**< Options in use. */
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pjmedia_sdp_neg *neg; /**< Negotiator. */
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pjsip_transaction *invite_tsx; /**< 1st invite tsx. */
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pjsip_tx_data *invite_req; /**< Saved invite req */
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pjsip_tx_data *last_answer; /**< Last INVITE resp. */
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pjsip_tx_data *last_ack; /**< Last ACK request */
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pj_int32_t last_ack_cseq; /**< CSeq of last ACK */
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void *mod_data[PJSIP_MAX_MODULE];/**< Modules data. */
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struct pjsip_timer *timer; /**< Session Timers. */
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};
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/**
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* This structure represents SDP information in a pjsip_rx_data. Application
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* retrieve this information by calling #pjsip_rdata_get_sdp_info(). This
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* mechanism supports multipart message body.
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*/
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typedef struct pjsip_rdata_sdp_info
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{
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/**
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* Pointer and length of the text body in the incoming message. If
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* the pointer is NULL, it means the message does not contain SDP
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* body.
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*/
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pj_str_t body;
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/**
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* This will contain non-zero if an invalid SDP body is found in the
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* message.
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*/
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pj_status_t sdp_err;
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/**
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* A parsed and validated SDP body.
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*/
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pjmedia_sdp_session *sdp;
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} pjsip_rdata_sdp_info;
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/**
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* Initialize the invite usage module and register it to the endpoint.
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* The callback argument contains pointer to functions to be called on
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* occurences of events in invite sessions.
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*
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* @param endpt The endpoint instance.
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* @param cb Callback structure.
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*
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* @return PJ_SUCCESS on success, or the appropriate error code.
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*/
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PJ_DECL(pj_status_t) pjsip_inv_usage_init(pjsip_endpoint *endpt,
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const pjsip_inv_callback *cb);
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/**
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* Get the INVITE usage module instance.
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*
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* @return PJ_SUCCESS on success, or the appropriate error code.
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*/
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PJ_DECL(pjsip_module*) pjsip_inv_usage_instance(void);
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/**
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* Dump user agent contents (e.g. all dialogs).
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*/
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PJ_DECL(void) pjsip_inv_usage_dump(void);
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/**
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* Create UAC invite session for the specified dialog in dlg.
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*
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* @param dlg The dialog which will be used by this invite session.
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* @param local_sdp If application has determined its media capability,
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* it can specify the SDP here. Otherwise it can leave
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* this to NULL, to let remote UAS specifies an offer.
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* @param options The options argument is bitmask combination of SIP
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* features in pjsip_inv_options enumeration.
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* @param p_inv On successful return, the invite session will be put
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* in this argument.
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*
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* @return The function will return PJ_SUCCESS if it can create
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* the session. Otherwise the appropriate error status
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* will be returned on failure.
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*/
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PJ_DECL(pj_status_t) pjsip_inv_create_uac(pjsip_dialog *dlg,
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const pjmedia_sdp_session *local_sdp,
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unsigned options,
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pjsip_inv_session **p_inv);
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|
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/**
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* Application SHOULD call this function upon receiving the initial INVITE
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* request in rdata before creating the invite session (or even dialog),
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* to verify that the invite session can handle the INVITE request.
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* This function verifies that local endpoint is capable to handle required
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* SIP extensions in the request (i.e. Require header) and also the media,
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* if media description is present in the request.
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*
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* @param rdata The incoming INVITE request.
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*
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* @param options Upon calling this function, the options argument
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* MUST contain the desired SIP extensions to be
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* applied to the session. Upon return, this argument
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* will contain the SIP extension that will be applied
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* to the session, after considering the Supported,
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* Require, and Allow headers in the request.
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*
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* @param sdp If local media capability has been determined,
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* and if application wishes to verify that it can
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* handle the media offer in the incoming INVITE
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* request, it SHOULD specify its local media capability
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* in this argument.
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* If it is not specified, media verification will not
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* be performed by this function.
|
|
*
|
|
* @param dlg If tdata is not NULL, application needs to specify
|
|
* how to create the response. Either dlg or endpt
|
|
* argument MUST be specified, with dlg argument takes
|
|
* precedence when both are specified.
|
|
*
|
|
* If a dialog has been created prior to calling this
|
|
* function, then it MUST be specified in dlg argument.
|
|
* Otherwise application MUST specify the endpt argument
|
|
* (this is useful e.g. when application wants to send
|
|
* the response statelessly).
|
|
*
|
|
* @param endpt If tdata is not NULL, application needs to specify
|
|
* how to create the response. Either dlg or endpt
|
|
* argument MUST be specified, with dlg argument takes
|
|
* precedence when both are specified.
|
|
*
|
|
* @param tdata If this argument is not NULL, this function will
|
|
* create the appropriate non-2xx final response message
|
|
* when the verification fails.
|
|
*
|
|
* @return If everything has been negotiated successfully,
|
|
* the function will return PJ_SUCCESS. Otherwise it
|
|
* will return the reason of the failure as the return
|
|
* code.
|
|
*
|
|
* This function is capable to create the appropriate
|
|
* response message when the verification has failed.
|
|
* If tdata is specified, then a non-2xx final response
|
|
* will be created and put in this argument upon return,
|
|
* when the verification has failed.
|
|
*
|
|
* If a dialog has been created prior to calling this
|
|
* function, then it MUST be specified in dlg argument.
|
|
* Otherwise application MUST specify the endpt argument
|
|
* (this is useful e.g. when application wants to send
|
|
* the response statelessly).
|
|
*
|
|
* @see pjsip_inv_verify_request2()
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_verify_request( pjsip_rx_data *rdata,
|
|
unsigned *options,
|
|
const pjmedia_sdp_session *sdp,
|
|
pjsip_dialog *dlg,
|
|
pjsip_endpoint *endpt,
|
|
pjsip_tx_data **tdata);
|
|
|
|
/**
|
|
* Variant of #pjsip_inv_verify_request() which allows application to specify
|
|
* the parsed SDP in the \a offer argument. This is useful to avoid having to
|
|
* re-parse the SDP in the incoming request.
|
|
*
|
|
* @see pjsip_inv_verify_request()
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_verify_request2( pjsip_rx_data *rdata,
|
|
unsigned *options,
|
|
const pjmedia_sdp_session *offer,
|
|
const pjmedia_sdp_session *answer,
|
|
pjsip_dialog *dlg,
|
|
pjsip_endpoint *endpt,
|
|
pjsip_tx_data **tdata);
|
|
|
|
/**
|
|
* Variant of #pjsip_inv_verify_request() which allows application not to
|
|
* specify the rdata (i.e. pass NULL as the rdata parameter) and specify
|
|
* the parsed SDP in the \a offer argument and a temporary pool in the
|
|
* \a tmp_pool argument.
|
|
* This is useful if application no longer has access to the rdata.
|
|
*
|
|
* @see pjsip_inv_verify_request()
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_verify_request3( pjsip_rx_data *rdata,
|
|
pj_pool_t *tmp_pool,
|
|
unsigned *options,
|
|
const pjmedia_sdp_session *offer,
|
|
const pjmedia_sdp_session *answer,
|
|
pjsip_dialog *dlg,
|
|
pjsip_endpoint *endpt,
|
|
pjsip_tx_data **tdata);
|
|
|
|
|
|
/**
|
|
* Create UAS invite session for the specified dialog in dlg. Application
|
|
* SHOULD call the verification function before calling this function,
|
|
* to ensure that it can create the session successfully.
|
|
*
|
|
* @param dlg The dialog to be used.
|
|
* @param rdata Application MUST specify the received INVITE request
|
|
* in rdata. The invite session needs to inspect the
|
|
* received request to see if the request contains
|
|
* features that it supports.
|
|
* @param local_sdp If application has determined its media capability,
|
|
* it can specify this capability in this argument.
|
|
* If SDP is received in the initial INVITE, the UAS
|
|
* capability specified in this argument doesn't have to
|
|
* match the received offer; the SDP negotiator is able
|
|
* to rearrange the media lines in the answer so that it
|
|
* matches the offer.
|
|
* @param options The options argument is bitmask combination of SIP
|
|
* features in pjsip_inv_options enumeration.
|
|
* @param p_inv Pointer to receive the newly created invite session.
|
|
*
|
|
* @return On successful, the invite session will be put in
|
|
* p_inv argument and the function will return PJ_SUCCESS.
|
|
* Otherwise the appropriate error status will be returned
|
|
* on failure.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_create_uas(pjsip_dialog *dlg,
|
|
pjsip_rx_data *rdata,
|
|
const pjmedia_sdp_session *local_sdp,
|
|
unsigned options,
|
|
pjsip_inv_session **p_inv);
|
|
|
|
|
|
/**
|
|
* Forcefully terminate and destroy INVITE session, regardless of
|
|
* the state of the session. Note that this function should only be used
|
|
* when there is failure in the INVITE session creation. After the
|
|
* invite session has been created and initialized, normally application
|
|
* SHOULD use #pjsip_inv_end_session() to end the INVITE session instead.
|
|
*
|
|
* Note also that this function may terminate the underlying dialog, if
|
|
* there are no other sessions in the dialog.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param st_code Status code for the reason of the termination.
|
|
* @param notify If set to non-zero, then on_state_changed()
|
|
* callback will be called.
|
|
*
|
|
* @return PJ_SUCCESS if the INVITE session has been
|
|
* terminated.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_terminate( pjsip_inv_session *inv,
|
|
int st_code,
|
|
pj_bool_t notify );
|
|
|
|
|
|
/**
|
|
* Restart UAC session and prepare the session for a new initial INVITE.
|
|
* This function can be called for example when the application wants to
|
|
* follow redirection response with a new call reusing this session so
|
|
* that the new call will have the same Call-ID and From headers. After
|
|
* the session is restarted, application may create and send a new INVITE
|
|
* request.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param new_offer Should be set to PJ_TRUE since the application will
|
|
* restart the session.
|
|
*
|
|
* @return PJ_SUCCESS on successful operation.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_uac_restart(pjsip_inv_session *inv,
|
|
pj_bool_t new_offer);
|
|
|
|
|
|
/**
|
|
* Accept or reject redirection response. Application MUST call this function
|
|
* after it signaled PJSIP_REDIRECT_PENDING in the \a on_redirected()
|
|
* callback, to notify the invite session whether to accept or reject the
|
|
* redirection to the current target. Application can use the combination of
|
|
* PJSIP_REDIRECT_PENDING command in \a on_redirected() callback and this
|
|
* function to ask for user permission before redirecting the call.
|
|
*
|
|
* Note that if the application chooses to reject or stop redirection (by
|
|
* using PJSIP_REDIRECT_REJECT or PJSIP_REDIRECT_STOP respectively), the
|
|
* session disconnection callback will be called before this function returns.
|
|
* And if the application rejects the target, the \a on_redirected() callback
|
|
* may also be called before this function returns if there is another target
|
|
* to try.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param cmd Redirection operation. The semantic of this argument
|
|
* is similar to the description in the \a on_redirected()
|
|
* callback, except that the PJSIP_REDIRECT_PENDING is
|
|
* not accepted here.
|
|
* @param e Should be set to NULL.
|
|
*
|
|
* @return PJ_SUCCESS on successful operation.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_process_redirect(pjsip_inv_session *inv,
|
|
pjsip_redirect_op cmd,
|
|
pjsip_event *e);
|
|
|
|
|
|
/**
|
|
* Create the initial INVITE request for this session. This function can only
|
|
* be called for UAC session. If local media capability is specified when
|
|
* the invite session was created, then this function will put an SDP offer
|
|
* in the outgoing INVITE request. Otherwise the outgoing request will not
|
|
* contain SDP body.
|
|
*
|
|
* @param inv The UAC invite session.
|
|
* @param p_tdata The initial INVITE request will be put in this
|
|
* argument if it can be created successfully.
|
|
*
|
|
* @return PJ_SUCCESS if the INVITE request can be created.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_invite( pjsip_inv_session *inv,
|
|
pjsip_tx_data **p_tdata );
|
|
|
|
|
|
/**
|
|
* Create the initial response message for the incoming INVITE request in
|
|
* rdata with status code st_code and optional status text st_text. Use
|
|
* #pjsip_inv_answer() to create subsequent response message.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_initial_answer( pjsip_inv_session *inv,
|
|
pjsip_rx_data *rdata,
|
|
int st_code,
|
|
const pj_str_t *st_text,
|
|
const pjmedia_sdp_session *sdp,
|
|
pjsip_tx_data **p_tdata);
|
|
|
|
/**
|
|
* Create a response message to the initial INVITE request. This function
|
|
* can only be called for the initial INVITE request, as subsequent
|
|
* re-INVITE request will be answered automatically.
|
|
*
|
|
* @param inv The UAS invite session.
|
|
* @param st_code The st_code contains the status code to be sent,
|
|
* which may be a provisional or final response.
|
|
* @param st_text If custom status text is desired, application can
|
|
* specify the text in st_text; otherwise if this
|
|
* argument is NULL, default status text will be used.
|
|
* @param local_sdp If application has specified its media capability
|
|
* during creation of UAS invite session, the local_sdp
|
|
* argument MUST be NULL. This is because application
|
|
* can not perform more than one SDP offer/answer session
|
|
* in a single INVITE transaction.
|
|
* If application has not specified its media capability
|
|
* during creation of UAS invite session, it MAY or MUST
|
|
* specify its capability in local_sdp argument,
|
|
* depending whether st_code indicates a 2xx final
|
|
* response.
|
|
* @param p_tdata Pointer to receive the response message created by
|
|
* this function.
|
|
*
|
|
* @return PJ_SUCCESS if response message was created
|
|
* successfully.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_answer( pjsip_inv_session *inv,
|
|
int st_code,
|
|
const pj_str_t *st_text,
|
|
const pjmedia_sdp_session *local_sdp,
|
|
pjsip_tx_data **p_tdata );
|
|
|
|
|
|
/**
|
|
* Set local offer or answer depending on negotiator state (it may also
|
|
* create a negotiator if it doesn't exist yet).
|
|
*
|
|
* @param inv The invite session.
|
|
* @param sdp The SDP description which will be set as
|
|
* an offer/answer to remote.
|
|
*
|
|
* @return PJ_SUCCESS if local offer/answer can be accepted by
|
|
* SDP negotiator.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_set_local_sdp(pjsip_inv_session *inv,
|
|
const pjmedia_sdp_session *sdp );
|
|
|
|
|
|
/**
|
|
* Set local answer to respond to remote SDP offer, to be carried by
|
|
* subsequent response (or request).
|
|
*
|
|
* @param inv The invite session.
|
|
* @param sdp The SDP description which will be set as answer
|
|
* to remote.
|
|
*
|
|
* @return PJ_SUCCESS if local answer can be accepted by
|
|
* SDP negotiator.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_set_sdp_answer(pjsip_inv_session *inv,
|
|
const pjmedia_sdp_session *sdp );
|
|
|
|
|
|
/**
|
|
* Create a SIP message to initiate invite session termination. Depending on
|
|
* the state of the session, this function may return CANCEL request,
|
|
* a non-2xx final response, a BYE request, or even no request.
|
|
*
|
|
* For UAS, if the session has not answered the incoming INVITE, this function
|
|
* creates the non-2xx final response with the specified status code in
|
|
* \a st_code and optional status text in \a st_text.
|
|
*
|
|
* For UAC, if the original INVITE has not been answered with a final
|
|
* response, the behavior depends on whether provisional response has been
|
|
* received. If provisional response has been received, this function will
|
|
* create CANCEL request. If no provisional response has been received, the
|
|
* function will not create CANCEL request (the function will return
|
|
* PJ_SUCCESS but the \a p_tdata will contain NULL) because we cannot send
|
|
* CANCEL before receiving provisional response. If then a provisional
|
|
* response is received, the invite session will send CANCEL automatically.
|
|
*
|
|
* For both UAC and UAS, if the INVITE session has been answered with final
|
|
* response, a BYE request will be created.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param st_code Status code to be used for terminating the session.
|
|
* @param st_text Optional status text.
|
|
* @param p_tdata Pointer to receive the message to be created. Note
|
|
* that it's possible to receive NULL here while the
|
|
* function returns PJ_SUCCESS, see the description.
|
|
*
|
|
* @return PJ_SUCCESS if termination is initiated.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_end_session( pjsip_inv_session *inv,
|
|
int st_code,
|
|
const pj_str_t *st_text,
|
|
pjsip_tx_data **p_tdata );
|
|
|
|
|
|
|
|
/**
|
|
* Create a re-INVITE request.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param new_contact If application wants to update its local contact and
|
|
* inform peer to perform target refresh with a new
|
|
* contact, it can specify the new contact in this
|
|
* argument; otherwise this argument must be NULL.
|
|
* @param new_offer Application MAY initiate a new SDP offer/answer
|
|
* session in the request when there is no pending
|
|
* answer to be sent or received. It can detect this
|
|
* condition by observing the state of the SDP
|
|
* negotiator of the invite session. If new offer
|
|
* should be sent to remote, the offer must be specified
|
|
* in this argument, otherwise it must be NULL.
|
|
* @param p_tdata Pointer to receive the re-INVITE request message to
|
|
* be created.
|
|
*
|
|
* @return PJ_SUCCESS if a re-INVITE request with the specified
|
|
* characteristics (e.g. to contain new offer) can be
|
|
* created.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_reinvite(pjsip_inv_session *inv,
|
|
const pj_str_t *new_contact,
|
|
const pjmedia_sdp_session *new_offer,
|
|
pjsip_tx_data **p_tdata );
|
|
|
|
|
|
|
|
/**
|
|
* Create an UPDATE request to initiate new SDP offer.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param new_contact If application wants to update its local contact
|
|
* and inform peer to perform target refresh with a new
|
|
* contact, it can specify the new contact in this
|
|
* argument; otherwise this argument must be NULL.
|
|
* @param offer Offer to be sent to remote. This argument is
|
|
* mandatory.
|
|
* @param p_tdata Pointer to receive the UPDATE request message to
|
|
* be created.
|
|
*
|
|
* @return PJ_SUCCESS if a UPDATE request with the specified
|
|
* characteristics (e.g. to contain new offer) can be
|
|
* created.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_update ( pjsip_inv_session *inv,
|
|
const pj_str_t *new_contact,
|
|
const pjmedia_sdp_session *offer,
|
|
pjsip_tx_data **p_tdata );
|
|
|
|
|
|
/**
|
|
* Create an ACK request. Normally ACK request transmission is handled
|
|
* by the framework. Application only needs to use this function if it
|
|
* handles the ACK transmission manually, by overriding \a on_send_ack()
|
|
* callback in #pjsip_inv_callback.
|
|
*
|
|
* Note that if the invite session has a pending offer to be answered
|
|
* (for example when the last 2xx response to INVITE contains an offer),
|
|
* application MUST have set the SDP answer with #pjsip_create_sdp_body()
|
|
* prior to creating the ACK request. In this case, the ACK request
|
|
* will be added with SDP message body.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param cseq Mandatory argument to specify the CSeq of the
|
|
* ACK request. This value MUST match the value
|
|
* of the INVITE transaction to be acknowledged.
|
|
* @param p_tdata Pointer to receive the ACK request message to
|
|
* be created.
|
|
*
|
|
* @return PJ_SUCCESS if ACK request has been created.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_create_ack(pjsip_inv_session *inv,
|
|
int cseq,
|
|
pjsip_tx_data **p_tdata);
|
|
|
|
|
|
/**
|
|
* Send request or response message in tdata.
|
|
*
|
|
* @param inv The invite session.
|
|
* @param tdata The message to be sent.
|
|
*
|
|
* @return PJ_SUCCESS if transaction can be initiated
|
|
* successfully to send this message. Note that the
|
|
* actual final state of the transaction itself will
|
|
* be reported later, in on_tsx_state_changed()
|
|
* callback.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_inv_send_msg(pjsip_inv_session *inv,
|
|
pjsip_tx_data *tdata);
|
|
|
|
|
|
/**
|
|
* Get the invite session for the dialog, if any.
|
|
*
|
|
* @param dlg The dialog which invite session is being queried.
|
|
*
|
|
* @return The invite session instance which has been
|
|
* associated with this dialog, or NULL.
|
|
*/
|
|
PJ_DECL(pjsip_inv_session*) pjsip_dlg_get_inv_session(pjsip_dialog *dlg);
|
|
|
|
/**
|
|
* Get the invite session instance associated with transaction tsx, if any.
|
|
*
|
|
* @param tsx The transaction, which invite session is being
|
|
* queried.
|
|
*
|
|
* @return The invite session instance which has been
|
|
* associated with this transaction, or NULL.
|
|
*/
|
|
PJ_DECL(pjsip_inv_session*) pjsip_tsx_get_inv_session(pjsip_transaction *tsx);
|
|
|
|
|
|
/**
|
|
* Get state names for INVITE session state.
|
|
*
|
|
* @param state The invite state.
|
|
*
|
|
* @return String describing the state.
|
|
*/
|
|
PJ_DECL(const char *) pjsip_inv_state_name(pjsip_inv_state state);
|
|
|
|
|
|
/**
|
|
* This is a utility function to create SIP body for SDP content.
|
|
*
|
|
* @param pool Pool to allocate memory.
|
|
* @param sdp SDP session to be put in the SIP message body.
|
|
* @param p_body Pointer to receive SIP message body containing
|
|
* the SDP session.
|
|
*
|
|
* @return PJ_SUCCESS on success.
|
|
*/
|
|
PJ_DECL(pj_status_t) pjsip_create_sdp_body(pj_pool_t *pool,
|
|
pjmedia_sdp_session *sdp,
|
|
pjsip_msg_body **p_body);
|
|
|
|
/**
|
|
* Retrieve SDP information from an incoming message. Application should
|
|
* prefer to use this function rather than parsing the SDP manually since
|
|
* this function supports multipart message body.
|
|
*
|
|
* This function will only parse the SDP once, the first time it is called
|
|
* on the same message. Subsequent call on the same message will just pick
|
|
* up the already parsed SDP from the message.
|
|
*
|
|
* @param rdata The incoming message.
|
|
*
|
|
* @return The SDP info.
|
|
*/
|
|
PJ_DECL(pjsip_rdata_sdp_info*) pjsip_rdata_get_sdp_info(pjsip_rx_data *rdata);
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PJ_END_DECL
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/**
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* @}
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*/
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#endif /* __SIP_INVITE_SESSION_H__ */
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