c++ - 使用 Qt 和 pjsip 在一个应用程序中的多个端口上监听 SIP

Question

我正在尝试在基于 Qt 控制台的应用程序中的多个端口上监听 SIP 消息。我只是在创建我的类代理的多个对象。

proxy.cpp 示例:

proxy* thisProxy;
proxy::proxy(quint16 port, QObject *parent) :
    QObject(parent), portFromConfig(port)
{
    thisProxy = this;
    thread = new QThread(this);
    connect(thread, SIGNAL(started()), this, SLOT(start()));
    connect(thread, SIGNAL(finished()), this, SLOT(deleteLater()));
    this->moveToThread(thread);
    thread->start();
}

void proxy::start()
{
    pj_status_t status;
    pj_caching_pool caching_pool;
    pj_sockaddr_in sockaddr;
    pj_str_t ourAddressFromConfig;

    pj_thread_desc initdec;
    pj_thread_t* thread = 0;

    if (!pj_thread_is_registered() && pj_thread_register("PJ_THREAD", initdec, &thread ) != PJ_SUCCESS)
        return;

    pjsip_module proxy = {
        NULL,
        NULL,
        pj_str("proxy"),
        -1,
        PJSIP_MOD_PRIORITY_UA_PROXY_LAYER,
        NULL,
        NULL,
        NULL,
        NULL,
        &onReceivedRequest,
        &onReceivedResponse,
        NULL,
        NULL,
        NULL
    };

    pj_log_set_level(4);

    //initialize pj
    status = pj_init();
    if (status != PJ_SUCCESS)
    {
        qDebug() << "pj_init failed";
        return;
    }

    //initilaize pjlib_util
    status = pjlib_util_init();
    if (status != PJ_SUCCESS)
    {
        qDebug() << "pjlib_util_init failed";
        return;
    }

    //initialize caching pool
    pj_caching_pool_init(&caching_pool, &pj_pool_factory_default_policy, 0);

    //create the endpoint
    status = pjsip_endpt_create(&caching_pool.factory, NULL, &endpoint);
    if (status != PJ_SUCCESS)
    {
        qDebug() << "pjsip_endpt_create failed";
        return;
    }

    //specify our socket
    ourAddressFromConfig = pj_str(addressFromConfig.toLatin1().data());
    sockaddr.sin_family = pj_AF_INET();

    if (ourAddressFromConfig.slen)
        pj_inet_aton(&ourAddressFromConfig, &sockaddr.sin_addr);
    else
        sockaddr.sin_addr.s_addr = 0;

    sockaddr.sin_port = pj_htons((pj_uint16_t) portFromConfig);

    //start the socket
    status = pjsip_udp_transport_start(endpoint, &sockaddr, NULL, 1, &transport);
    if (status != PJ_SUCCESS)
    {
        qDebug() << "pjsip_udp_transport_start failed";
        return;
    }

    //create the caching pool
    poolt = pj_pool_create(&caching_pool.factory, "UDPproxy", 4000, 4000, NULL);

    //register the proxy module
    status = pjsip_endpt_register_module(endpoint, &proxy);
    if (status != PJ_SUCCESS)
    {
        qDebug() << "pjsip_endpt_register_module failed";
        return;
    }

    pj_time_val delay = {0, 10};

    while(true)
    {
        pjsip_endpt_handle_events(endpoint, &delay);
    }

    qDebug() << "finished";
}

最有趣的是，当我创建前两个 proxy 实例时，它可以正常工作，但是当我创建第三个实例时，我的应用程序因这些错误而终止:

server: ../src/pjsip/sip_tel_uri.c:173: pjsip_tel_uri_subsys_init: Assertion `status==0' failed.
Aborted (core dumped)

来自转储核心的回溯:

(gdb) bt
#0  0xb777d424 in __kernel_vsyscall ()
#1  0xb6e881df in raise () from /lib/i386-linux-gnu/libc.so.6
#2  0xb6e8b825 in abort () from /lib/i386-linux-gnu/libc.so.6
#3  0xb6e81085 in ?? () from /lib/i386-linux-gnu/libc.so.6
#4  0xb6e81137 in __assert_fail () from /lib/i386-linux-gnu/libc.so.6
#5  0x08079344 in pjsip_tel_uri_subsys_init ()
#6  0x08069265 in pjsip_endpt_create ()
#7  0x080569a7 in proxy::start (this=0x8905db8) at ../server/proxy.cpp:93
#8  0x0805f0c1 in proxy::qt_static_metacall (_o=0x8905db8, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xb3aff270) at moc_proxy.cpp:75
#9  0xb73d4c5d in QMetaObject::activate(QObject*, int, int, void**) () from /home/dev/Qt/5.1.1/gcc/lib/libQt5Core.so.5
#10 0xb73d567b in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /home/dev/Qt/5.1.1/gcc/lib/libQt5Core.so.5
#11 0xb7444ef5 in QThread::started(QThread::QPrivateSignal) () from /home/dev/Qt/5.1.1/gcc/lib/libQt5Core.so.5
#12 0xb71d7388 in ?? () from /home/dev/Qt/5.1.1/gcc/lib/libQt5Core.so.5
#13 0xb713ad4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#14 0xb6f49bae in clone () from /lib/i386-linux-gnu/libc.so.6

我不知道我做错了什么。有人可以帮忙吗？

在此先感谢您的帮助。

Answer 1

主要问题是您要在每个 proxy 实例上创建一个新的 SIP 端点，尽管当前文档指出“理论上”支持 SIP 端点的多个实例，但实际上并非如此.

更具体地说，当您第一次调用 pjsip_endpt_create 时，会注册三个静态 URI 解析器(用于 sip:、sips: 和 tel :), 第二次tel:又被注册了(有检查避免sip:和sips:但不是tel:) 并且，当第三次尝试再次注册 tel: 时，超过了 URI 解析器的最大数量 (4)，注册失败并且断言转储。

我建议您只使用一个 SIP 端点，为每个 proxy 实例创建一个新的 UDP 套接字，并使用 pjsip_udp_transport_attach2 将其附加到端点