linux sip服务器代码

以下是基于 PJSIP 库的 Linux SIP 服务器示例代码：

#include <pjlib.h>
#include <pjlib-util.h>
#include <pjnath.h>
#include <pjmedia.h>
#include <pjmedia-codec.h>
#include <pjsip.h>
#include <pjsip_ua.h>
#include <pjsip_simple.h>

#define THIS_FILE   "sip_server.c"

/* Port to listen for incoming SIP requests */
#define SIP_PORT    5060

/* SIP logging callback */
static void log_cb(int level, const char *data, int len) {
    PJ_LOG(level, (THIS_FILE, "%.*s", len, data));
}

/* SIP user agent callback */
static pj_bool_t on_rx_request(pjsip_rx_data *rdata) {
    /* Handle incoming SIP request here */
    return PJ_TRUE;
}

/* Main function */
int main(int argc, char *argv[]) {
    pj_status_t status;
    pjsip_endpoint *endpoint;
    pj_caching_pool cp;
    pj_pool_t *pool;
    pj_thread_t *thread;

    /* Initialize PJLIB */
    status = pj_init();
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);

    /* Create a pool factory */
    pj_caching_pool_init(&cp, NULL, 0);

    /* Create a new memory pool */
    pool = pj_pool_create(&cp.factory, "sip_server", 4000, 4000, NULL);

    /* Create a new SIP endpoint */
    status = pjsip_endpt_create(&cp.factory, NULL, &endpoint);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);

    /* Initialize endpoint logging */
    pjsip_endpt_set_log_func(endpoint, log_cb, NULL, 4);

    /* Initialize SIP stack */
    status = pjsip_endpt_startup(endpoint, NULL, 1, NULL);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);

    /* Create a transport adapter */
    status = pjsip_udp_transport_start(endpoint, NULL, SIP_PORT, NULL, 1, NULL);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);

    /* Register user agent callback */
    status = pjsip_endpt_register_module(endpoint, &pjsip_simple_module);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);

    /* Create a new thread for handling incoming requests */
    status = pj_thread_create(pool, "sip_server_thread", (pj_thread_proc*)&pjsip_endpt_handle_events, endpoint, PJ_THREAD_DEFAULT_STACK_SIZE, 0, &thread);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);

    /* Wait for user input */
    while (1) {
        char ch;
        PJ_LOG(3, (THIS_FILE, "Press 'q' to quit..."));
        scanf("%c", &ch);
        if (ch == 'q') {
            break;
        }
    }

    /* Stop SIP stack */
    pjsip_endpt_shutdown(endpoint);

    /* Destroy endpoint */
    pjsip_endpt_destroy(endpoint);

    /* Destroy memory pool */
    pj_pool_release(pool);

    /* Shutdown PJLIB */
    pj_shutdown();

    return 0;
}

这是一个基本的 SIP 服务器示例，可以接收来自客户端的 SIP 请求。你需要根据实际需求进行修改和扩展。