---

PJ_DEF(pj_status_t) pjsua_get_snd_dev2(pjsua_snd_dev_param *snd_param)
{
    PJ_ASSERT_RETURN(snd_param, PJ_EINVAL);

    PJSUA_LOCK();
    snd_param->capture_dev = pjsua_var.cap_dev;
    snd_param->playback_dev = pjsua_var.play_dev;
    snd_param->mode = pjsua_var.snd_mode;
    PJSUA_UNLOCK();

    return PJ_SUCCESS;
}

PJ_DEF(void) pjsua_snd_dev_param_default(pjsua_snd_dev_param *prm)
{
    pj_bzero(prm, sizeof(*prm));
    prm->capture_dev = PJMEDIA_AUD_DEFAULT_CAPTURE_DEV;
    prm->playback_dev = PJMEDIA_AUD_DEFAULT_PLAYBACK_DEV;
}

PJ_DEF(pj_status_t) pjsua_set_snd_dev(int capture_dev,
                                      int playback_dev)
{
    pjsua_snd_dev_param param;

    pjsua_snd_dev_param_default(&param);
    pjsua_get_snd_dev2(&param);
    param.capture_dev = capture_dev;
    param.playback_dev = playback_dev;

    /* Always open the sound device. */
    param.mode &= ~PJSUA_SND_DEV_NO_IMMEDIATE_OPEN;

    return pjsua_set_snd_dev2(&param);
}

этим способом никакие параметры не установятся нормально(clock_rate,channel_count,sample_rate)