// ========================================================================
// Copyright 2008-2010 NEXCOM Systems
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================
package org.cipango.example;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.sip.SipApplicationSession;
import javax.servlet.sip.SipServlet;
import javax.servlet.sip.SipServletRequest;
import javax.servlet.sip.SipServletResponse;
import org.mortbay.log.Log;
public class DtmfServlet extends SipServlet
{
public static final int DTMF_PAYLOAD_TYPE = 101;
private static final long serialVersionUID = 1L;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
log("init");
SdpParser sdpParser = new SdpParser();
ServletContext servletContext = getServletContext();
servletContext.setAttribute(SdpParser.class.getName(), sdpParser);
}
@Override
protected void doRegister(SipServletRequest register)
throws ServletException, IOException {
log("doRegister");
register.createResponse(SipServletResponse.SC_OK).send();
}
@Override
protected void doInvite(SipServletRequest invite) throws ServletException,
IOException {
log("doInvite");
invite.createResponse(SipServletResponse.SC_RINGING).send();
ServletContext servletContext = getServletContext();
SdpParser sdpParser = (SdpParser)servletContext.getAttribute(
SdpParser.class.getName());
Charset charset = Charset.forName("UTF-8");
Object contentObject = invite.getContent();
String sdp;
if (contentObject instanceof String)
sdp = (String)contentObject;
else
{
byte[] content = (byte[])contentObject;
sdp = new String(content, charset);
}
RtpConnection rtpConnection = sdpParser.getRtpConnection(sdp);
if (rtpConnection == null)
{
invite.createResponse(SipServletResponse.SC_NOT_ACCEPTABLE).send();
return;
}
int audioPayloadType;
List<Integer> payloadTypes = rtpConnection.getPayloadTypes();
if (payloadTypes.contains(0))
audioPayloadType = 0;
else if (payloadTypes.contains(8))
audioPayloadType = 8;
else
{
invite.createResponse(SipServletResponse.SC_NOT_ACCEPTABLE).send();
return;
}
if (!payloadTypes.contains(DTMF_PAYLOAD_TYPE))
{
invite.createResponse(SipServletResponse.SC_NOT_ACCEPTABLE).send();
return;
}
int port = rtpConnection.getPort();
DtmfSession dtmfSession = new DtmfSession(DTMF_PAYLOAD_TYPE,
rtpConnection.getHost(), port, audioPayloadType);
try
{
dtmfSession.init();
}
catch (Exception e)
{
Log.warn("cannot initialize dtmf session on port " + port, e);
SipServletResponse resp = invite.createResponse(
SipServletResponse.SC_SERVER_INTERNAL_ERROR);
resp.send();
return;
}
invite.getApplicationSession(true).setAttribute(
DtmfSession.class.getName(), dtmfSession);
SipServletResponse resp =
invite.createResponse(SipServletResponse.SC_OK);
String sdpAnswer = "v=0\r\n"
+ "o=user1 123 456 IN IP4 127.0.0.1\r\n"
+ "s=-\r\n"
+ "c=IN IP4 127.0.0.1\r\n"
+ "t=0 0\r\n"
+ "m=audio " + dtmfSession.getLocalPort() + " RTP/AVP "
+ audioPayloadType + " " + DTMF_PAYLOAD_TYPE + "\r\n"
+ "a=rtpmap:0 PCMU/8000\r\n"
+ "a=rtpmap:" + DTMF_PAYLOAD_TYPE + " telephone-event/8000\r\n"
+ "a=fmtp:" + DTMF_PAYLOAD_TYPE + " 0-15\r\n";
resp.setContent(sdpAnswer.getBytes(charset), "application/sdp");
resp.send();
}
@Override
protected void doAck(SipServletRequest ack) throws ServletException,
IOException {
log("doAck");
SipApplicationSession sipApplicationSession =
ack.getApplicationSession();
DtmfSession dtmfSession = (DtmfSession)
sipApplicationSession.getAttribute(DtmfSession.class.getName());
dtmfSession.start();
}
@Override
protected void doBye(SipServletRequest bye) throws ServletException,
IOException {
log("doBye");
bye.createResponse(SipServletResponse.SC_OK).send();
SipApplicationSession sipApplicationSession =
bye.getApplicationSession();
DtmfSession dtmfSession = (DtmfSession)
sipApplicationSession.getAttribute(DtmfSession.class.getName());
dtmfSession.stop();
bye.getSession().invalidate();
sipApplicationSession.invalidate();
}
}