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246 lines
8.0 KiB
246 lines
8.0 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_100REL_H__
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#define __SIP_100REL_H__
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/**
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* @file sip_100rel.h
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* @brief PRACK (Reliability of Provisional Responses)
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*/
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#include <pjsip-ua/sip_inv.h>
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/**
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* @defgroup PJSIP_100REL 100rel/PRACK - Reliability of Provisional Responses
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* @ingroup PJSIP_HIGH_UA
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* @brief PRACK - Reliability of Provisional Responses
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* @{
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*
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* This module provides management of Reliability of Provisional Responses
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* (\a 100rel and \a PRACK), as described in RFC 3262.
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*
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* Other than the #pjsip_100rel_init_module() function, the 100rel API
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* exported by this module are not intended to be used by application, but
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* rather they will be invoked by the \ref PJSIP_INV.
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*
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* \section pjsip_100rel_using Using Reliable Provisional Response
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*
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* \subsection pjsip_100rel_init Initializing 100rel Module
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*
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* Application must explicitly initialize 100rel module by calling
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* #pjsip_100rel_init_module() in application initialization function.
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*
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* Once the 100rel module is initialized, it will register \a PRACK method
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* in \a Allow header, and \a 100rel tag in \a Supported header.
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*
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* \subsection pjsip_100rel_sess Using 100rel in a Session
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*
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* For UAC, \a 100rel support will be enabled in the session if \a 100rel
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* support is enabled in the library (default is yes).
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* Outgoing INVITE request will include \a 100rel tag in \a Supported
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* header and \a PRACK method in \a Allow header. When callee endpoint
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* sends reliable provisional responses, the UAC will automatically send
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* \a PRACK request to acknowledge the response. If callee endpoint doesn't
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* send reliable provisional response, the response will be handled using
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* normal, non-100rel procedure (that is, \a PRACK will not be sent).
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*
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* If the UAC wants to <b>mandate</b> \a 100rel support, it can specify
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* #PJSIP_INV_REQUIRE_100REL in the \a options argument when calling
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* #pjsip_inv_create_uac(). In this case, PJSIP will add \a 100rel tag
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* in the \a Require header of the outgoing INVITE request.
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*
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* For UAS, if it wants to support \a 100rel but not to mandate it,
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* it must specify #PJSIP_INV_SUPPORT_100REL flag in the \a options
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* argument when calling #pjsip_inv_verify_request(), and pass the same
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* \a options variable when calling #pjsip_inv_verify_request. If UAC had
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* specified \a 100rel in it's list of extensions in \a Require header,
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* the UAS will send provisional responses reliably. If UAC only listed
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* \a 100rel in its \a Supported header but not in \a Require header,
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* or if UAC does not list \a 100rel support at all, the UAS WILL NOT
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* send provisional responses reliably.
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* The snippet below can be used to accomplish this task:
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*
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* \verbatim
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unsigned options = 0;
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options |= PJSIP_INV_SUPPORT_100REL;
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status = pjsip_inv_verify_request(rdata, &options, answer, NULL,
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endpt, &resp);
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if (status != PJ_SUCCESS) {
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// INVITE request cannot be handled.
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// Reject the request with the response in resp.
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...
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return;
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}
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// Create UAS dialog, populate Contact header, etc.
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...
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// Create UAS invite session
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status = pjsip_inv_create_uas( dlg, rdata, answer, options, &inv);
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..
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\endverbatim
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*
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* For another requirement, if UAS wants to <b>mandate</b> \a 100rel support,
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* it can specify #PJSIP_INV_REQUIRE_100REL flag when calling
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* #pjsip_inv_verify_request(), and pass the \a options when calling
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* #pjsip_inv_verify_request. In this case,
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* \a 100rel extension will be used if UAC specifies \a 100rel in its
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* \a Supported header. If UAC does not list \a 100rel in \a Supported header,
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* the incoming INVITE request will be rejected with 421 (Extension Required)
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* response. For the sample code, it should be identical to the snippet
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* above, except that application must specify #PJSIP_INV_REQUIRE_100REL
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* flag in the \a options instead of #PJSIP_INV_SUPPORT_100REL.
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*
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* For yet another requirement, if UAS <b>does not</b> want to support
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* \a 100rel extension, it can reject incoming INVITE request with
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* 420 (Bad Extension) response whenever incoming INVITE request has
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* \a 100rel tag in its \a Require header. This can be done by specifying
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* zero as the \a options when calling #pjsip_inv_verify_request().
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*/
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PJ_BEGIN_DECL
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/**
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* PRACK method constant.
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* @see pjsip_get_prack_method()
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*/
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PJ_DECL_DATA(const pjsip_method) pjsip_prack_method;
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/**
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* Get #pjsip_invite_method constant.
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*/
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PJ_DECL(const pjsip_method*) pjsip_get_prack_method(void);
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/**
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* Initialize 100rel module. This function must be called once during
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* application initialization, to register 100rel module to SIP endpoint.
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*
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* @param endpt The SIP endpoint instance.
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*
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* @return PJ_SUCCESS if module is successfully initialized.
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*/
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PJ_DECL(pj_status_t) pjsip_100rel_init_module(pjsip_endpoint *endpt);
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/**
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* Add 100rel support to the specified invite session. This function will
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* be called internally by the invite session if it detects that the
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* session needs 100rel support.
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*
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* @param inv The invite session.
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*
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* @return PJ_SUCCESS on successful.
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*/
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PJ_DECL(pj_status_t) pjsip_100rel_attach(pjsip_inv_session *inv);
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/**
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* Check if incoming response has reliable provisional response feature.
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*
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* @param rdata Receive data buffer containing the response.
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*
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* @return PJ_TRUE if the provisional response is reliable.
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*/
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PJ_DECL(pj_bool_t) pjsip_100rel_is_reliable(pjsip_rx_data *rdata);
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/**
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* Create PRACK request for the incoming reliable provisional response.
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* Note that PRACK request MUST be sent using #pjsip_100rel_send_prack().
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*
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* @param inv The invite session.
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* @param rdata The incoming reliable provisional response.
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* @param p_tdata Upon return, it will be initialized with the
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* PRACK request.
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*
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* @return PJ_SUCCESS on successful.
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*/
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PJ_DECL(pj_status_t) pjsip_100rel_create_prack(pjsip_inv_session *inv,
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pjsip_rx_data *rdata,
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pjsip_tx_data **p_tdata);
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/**
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* Send PRACK request.
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*
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* @param inv The invite session.
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* @param tdata The PRACK request.
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*
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* @return PJ_SUCCESS on successful.
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*/
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PJ_DECL(pj_status_t) pjsip_100rel_send_prack(pjsip_inv_session *inv,
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pjsip_tx_data *tdata);
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/**
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* Handle incoming PRACK request.
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*
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* @param inv The invite session.
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* @param rdata Incoming PRACK request.
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*
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* @return PJ_SUCCESS on successful.
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*/
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PJ_DECL(pj_status_t) pjsip_100rel_on_rx_prack(pjsip_inv_session *inv,
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pjsip_rx_data *rdata);
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/**
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* Transmit INVITE response (provisional or final) reliably according to
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* 100rel specification. The 100rel module will take care of retransmitting
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* or enqueueing the response according to the current state of the
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* reliable response processing. This function will be called internally
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* by invite session.
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*
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* @param inv The invite session.
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* @param tdata The INVITE response.
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*
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* @return PJ_SUCCESS on successful.
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*/
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PJ_DECL(pj_status_t) pjsip_100rel_tx_response(pjsip_inv_session *inv,
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pjsip_tx_data *tdata);
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/**
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* Notify 100rel module that the invite session has been disconnected.
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*
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* @param inv The invite session.
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*
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* @return PJ_SUCCESS on successful.
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*/
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PJ_DECL(pj_status_t) pjsip_100rel_end_session(pjsip_inv_session *inv);
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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_100REL_H__ */
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