Help with rtpsend and rtplisten

Hello:
I'm trying to work with rtpsend and rtplisten in Win2000. I did some changes 
in main() functions and they don't work. The problem is that I can't recieve 
any packet, although rtpsend sends them.
My main() functions are:

/********RTPSEND**********/

int
main(int argc, char *argv[])
{
	cout << "rtpsend..." << endl;
	char datos[200], dir[16];
	char tstamp[18];
	char packets[18];
	char port[18];

	strcpy(datos, "Un saludo, majos");
	strcpy(dir, "158.227.66.64");
	strcpy(tstamp, "1000");
	strcpy(port, "3333");
	strcpy(packets, "10");

	/*if (argc != 6) {
		cerr << "Syntax: " << "data host port timestamp count" << endl;
		exit(1);
	}*/

	Sender sender((unsigned char *)datos, InetHostAddress(dir),
		      atoi(tstamp), atoi(tstamp), atoi(packets));

	cout << "I have sent " << packets
	     << " RTP packets containing \"" << datos
	     << "\", with timestamp " << tstamp
	     << " to " << dir << ":" << port
	     << endl;
	getch();
	return 0;
}

/*************RTPLISTEN***************/

int
main(int argc, char *argv[])
{
	cout << "rtplisten" << endl;

	/*if (argc != 3) {
		cerr << "Syntax: " << " ip port" << endl;
		exit(1);
	}*/

	char dir[16], puerto[16];

	strcpy(dir, "158.227.66.64");
	strcpy(puerto, "3333");

	InetMcastAddress ima;
	try {
		ima = InetMcastAddress(dir);
	} catch (...) {	}

	Listener *foo;
	tpport_t port = atoi(puerto);
	if ( ima.isInetAddress() ) {
		foo = new Listener(ima,port);
		cout << "Listening on multicast address " << ima << ":" <<
			port << endl;
	} else {
		InetHostAddress ia(dir);
		foo = new Listener(ia,atoi(puerto));
		cout << "Listening on unicast address " << ia << ":" <<
			port << endl;
	}
	cout << "Press Ctrl-C to finish." << endl;
	foo->listen();
	delete foo;
	return 0;
}

In RTPSEND program, it is what displays the monitor:

rtpsend...
My SSRC identifier is: 813147ed
I have sent 10 RTP packets containing: "Un saludo, majos", with timestamp 
1000 to 158.227.66.64:3333

And in RTPLISTEN

rtplisten
Listening on unicast address 158.227.66.64:3333
Press Control-C to finish.
My SSRC identifier is: ed589715

I tried to change listen port with 3332, but it doesn't work too.

Thanks for your replies.

MARIO