使用Qt和pjsip在一个应用程序中的多个端口上侦听SIP

Question

I am trying to listen for SIP messages on multiple ports within my Qt console-based application. I am simply creating multiple objects of my class proxy .

Sample example of proxy.cpp:

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";
}

The most interesting thing is that when I create first two instances of proxy its working but when I create the third instance my app terminates with these error:

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

Backtrace from dumped core:

(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

I don't know what am I doing wrong. Could anybody help, please?

Thanks in advance for any help.

Answer 1

Main problem is that you're creating a new SIP endpoint on every proxy instance and, although current documentation states that "theoretically", multiple instance of SIP endpoint is supported, actually, it is not.

More specifically, first time you call pjsip_endpt_create three static URI parsers are registered (for sip: , sips: and tel: ), second time tel: is registered again (there's a check to avoid sip: and sips: but not for tel: ) and, when trying to register tel: again, at third time, maximum number of URI parsers (4) is overpassed, registration fails and an assertion dumps.

I suggest you to work with only one SIP endpoint, creating a new UDP socket for every proxy instance and attaching it to the endpoint by using pjsip_udp_transport_attach2