LIVE555建立rtsp服务器，如何获取。客户端的连接信号

我目前使用MU609建立了ppp通讯，而且已经生成内网IP。使用live555也能建立这个IP的RTSP服务器，但是客户端就是连不上这个服务器，请问是什么原因呢，另外一个问题是LIVE555建立rtsp服务器，如何获取客户端的连接信号。我目前知道在/mediaserver/DynamicRTSPServer.cpp下的
[code]ServerMediaSession*
DynamicRTSPServer::lookupServerMediaSession(char const* streamName) {
  // First, check whether the specified "streamName" exists as a local file:
  printf("streamName is %s\n",streamName);
  printf("baimahe\n");
  FILE* fid = fopen(streamName, "rb");
  Boolean fileExists = fid != NULL;
  
  // Next, check whether we already have a "ServerMediaSession" for this file:
  ServerMediaSession* sms = RTSPServer::lookupServerMediaSession(streamName);
  Boolean smsExists = sms != NULL;

  // Handle the four possibilities for "fileExists" and "smsExists":
  if (!fileExists) {
    if (smsExists) {
      // "sms" was created for a file that no longer exists. Remove it:
      removeServerMediaSession(sms);
    }
    return NULL;
  } else {
    if (!smsExists) {
      // Create a new "ServerMediaSession" object for streaming from the named file.
      sms = createNewSMS(envir(), streamName, fid);
      addServerMediaSession(sms);
    }
    fclose(fid);
    return sms;
  }
}
[/code]