SIP如何封装语音包，并进行传输

	 */

	public void sendMessage(String to, String message) throws ParseException,

			InvalidArgumentException, SipException {



		SipURI from = addressFactory.createSipURI(getUsername(), getHost()

				+ ":" + getPort());

		Address fromNameAddress = addressFactory.createAddress(from);

		fromNameAddress.setDisplayName(getUsername());

		FromHeader fromHeader = headerFactory.createFromHeader(fromNameAddress,

				"textclientv1.0");



		String username = to.substring(to.indexOf(":") + 1, to.indexOf("@"));

		String address = to.substring(to.indexOf("@") + 1);



		SipURI toAddress = addressFactory.createSipURI(username, address);

		Address toNameAddress = addressFactory.createAddress(toAddress);

		toNameAddress.setDisplayName(username);

		ToHeader toHeader = headerFactory.createToHeader(toNameAddress, null);



		SipURI requestURI = addressFactory.createSipURI(username, address);

		requestURI.setTransportParam("udp");



		ArrayList viaHeaders = new ArrayList();

		ViaHeader viaHeader = headerFactory.createViaHeader(getHost(),

				getPort(), "udp", null);

		viaHeaders.add(viaHeader);



		CallIdHeader callIdHeader = sipProvider.getNewCallId();



		CSeqHeader cSeqHeader = headerFactory.createCSeqHeader(1,

				Request.MESSAGE);



		MaxForwardsHeader maxForwards = headerFactory

				.createMaxForwardsHeader(70);



		Request request = messageFactory.createRequest(requestURI,

				Request.MESSAGE, callIdHeader, cSeqHeader, fromHeader,

				toHeader, viaHeaders, maxForwards);



		SipURI contactURI = addressFactory.createSipURI(getUsername(),

				getHost());

		contactURI.setPort(getPort());

		Address contactAddress = addressFactory.createAddress(contactURI);

		contactAddress.setDisplayName(getUsername());

		ContactHeader contactHeader = headerFactory

				.createContactHeader(contactAddress);

		request.addHeader(contactHeader);



		ContentTypeHeader contentTypeHeader = headerFactory

				.createContentTypeHeader("text", "plain");

		request.setContent(message, contentTypeHeader);



		sipProvider.sendRequest(request);

	}