/**
   * Responds with <i>resp</i>. This method can be called when the InviteDialog is in D_INVITED or
   * D_BYED states.
   *
   * <p>If the CSeq method is INVITE and the response is 2xx, it moves to state D_ACCEPTED, adds a
   * new listener to the SipProviderListener, and creates new AckTransactionServer
   *
   * <p>If the CSeq method is INVITE and the response is not 2xx, it moves to state D_REFUSED, and
   * sends the response.
   */
  public void respond(Message resp)
        // private void respond(Message resp)
      {
    printLog("inside respond(resp)", LogLevel.MEDIUM);
    String method = resp.getCSeqHeader().getMethod();
    if (method.equals(SipMethods.INVITE)) {
      if (!verifyStatus(statusIs(D_INVITED) || statusIs(D_ReINVITED))) {
        printLog(
            "respond(): InviteDialog not in (re)invited state: No response now", LogLevel.HIGH);
        return;
      }

      int code = resp.getStatusLine().getCode();
      // 1xx provisional responses
      if (code >= 100 && code < 200) {
        invite_ts.respondWith(resp);
        return;
      }
      // For all final responses establish the dialog
      if (code >= 200) { // changeStatus(D_ACCEPTED);
        update(Dialog.UAS, resp);
      }
      // 2xx success responses
      if (code >= 200 && code < 300) {
        if (statusIs(D_INVITED)) changeStatus(D_ACCEPTED);
        else changeStatus(D_ReACCEPTED);
        // terminates the INVITE Transaction server and activates an ACK
        // Transaction server
        invite_ts.terminate();
        ConnectionIdentifier conn_id = invite_ts.getConnectionId();
        ack_ts = new AckTransactionServer(sip_provider, conn_id, resp, this);
        ack_ts.respond();
        // if (statusIs(D_ReACCEPTED))
        // listener.onDlgReInviteAccepted(this);
        // else listener.onDlgAccepted(this);
        return;
      } else
      // 300-699 failure responses
      // if (code>=300)
      {
        if (statusIs(D_INVITED)) changeStatus(D_REFUSED);
        else changeStatus(D_ReREFUSED);
        invite_ts.respondWith(resp);
        // if (statusIs(D_ReREFUSED))
        // listener.onDlgReInviteRefused(this);
        // else listener.onDlgRefused(this);
        return;
      }
    }
    if (method.equals(SipMethods.BYE)) {
      if (!verifyStatus(statusIs(D_BYED))) return;
      bye_ts.respondWith(resp);
    }
  }
 /** Responds with <i>resp</i>. */
 public void respond(Message resp) {
   printLog("inside respond(resp)", LogLevel.MEDIUM);
   if (resp.getStatusLine().getCode() >= 200) update(UAS, resp);
   subscribe_transaction.respondWith(resp);
 }
 /**
  * Inherited from class SipProviderListener. Called when a new message is received (out of any
  * ongoing transaction) for the current InviteDialog. Always checks for out-of-date methods (CSeq
  * header sequence number).
  *
  * <p>If the message is ACK(2xx/INVITE) request, it moves to D_CALL state, and fires
  * <i>onDlgAck(this,body,msg)</i>.
  *
  * <p>If the message is 2xx(INVITE) response, it create a new AckTransactionClient
  *
  * <p>If the message is BYE, it moves to D_BYED state, removes the listener from SipProvider,
  * fires onDlgBye(this,msg) then it responds with 200 OK, moves to D_CLOSE state and fires
  * onDlgClose(this)
  */
 public void onReceivedMessage(SipProvider sip_provider, Message msg) {
   printLog("inside onReceivedMessage(sip_provider,message)", LogLevel.MEDIUM);
   if (msg.isRequest()
       && !(msg.isAck() || msg.isCancel())
       && msg.getCSeqHeader().getSequenceNumber() <= getRemoteCSeq()) {
     printLog("Request message is too late (CSeq too small): Message discarded", LogLevel.HIGH);
     return;
   }
   // invite received
   if (msg.isRequest() && msg.isInvite()) {
     verifyStatus(statusIs(D_INIT) || statusIs(D_CALL));
     // NOTE: if the invite_ts.listen() is used, you should not arrive
     // here with the D_INIT state..
     // however state D_INIT has been included for robustness against
     // further changes.
     if (statusIs(D_INIT)) changeStatus(D_INVITED);
     else changeStatus(D_ReINVITED);
     invite_req = msg;
     invite_ts = new InviteTransactionServer(sip_provider, invite_req, this);
     // ((TransactionServer)transaction).listen();
     update(Dialog.UAS, invite_req);
     if (statusIs(D_INVITED))
       listener.onDlgInvite(
           this,
           invite_req.getToHeader().getNameAddress(),
           invite_req.getFromHeader().getNameAddress(),
           invite_req.getBody(),
           invite_req);
     else listener.onDlgReInvite(this, invite_req.getBody(), invite_req);
   } else
   // ack (of 2xx of INVITE)
   if (msg.isRequest() && msg.isAck()) {
     if (!verifyStatus(statusIs(D_ACCEPTED) || statusIs(D_ReACCEPTED))) return;
     changeStatus(D_CALL);
     // terminates the AckTransactionServer
     ack_ts.terminate();
     listener.onDlgAck(this, msg.getBody(), msg);
     listener.onDlgCall(this);
   } else
   // keep sending ACK (if already sent) for any "200 OK" received
   if (msg.isResponse()) {
     if (!verifyStatus(statusIs(D_CALL))) return;
     int code = msg.getStatusLine().getCode();
     verifyThat(code >= 200 && code < 300, "code 2xx was expected");
     if (ack_req != null) {
       AckTransactionClient ack_tc = new AckTransactionClient(sip_provider, ack_req, null);
       ack_tc.request();
     }
   } else
   // bye received
   if (msg.isRequest() && msg.isBye()) {
     if (!verifyStatus(statusIs(D_CALL) || statusIs(D_BYEING))) return;
     changeStatus(D_BYED);
     bye_ts = new TransactionServer(sip_provider, msg, this);
     // automatically sends a 200 OK
     Message resp = MessageFactory.createResponse(msg, 200, SipResponses.reasonOf(200), null);
     respond(resp);
     listener.onDlgBye(this, msg);
     changeStatus(D_CLOSE);
     listener.onDlgClose(this);
   } else
   // cancel received
   if (msg.isRequest() && msg.isCancel()) {
     if (!verifyStatus(statusIs(D_INVITED) || statusIs(D_ReINVITED))) return;
     // create a CANCEL TransactionServer and send a 200 OK (CANCEL)
     TransactionServer ts = new TransactionServer(sip_provider, msg, null);
     // ts.listen();
     ts.respondWith(MessageFactory.createResponse(msg, 200, SipResponses.reasonOf(200), null));
     // automatically sends a 487 Cancelled
     Message resp =
         MessageFactory.createResponse(invite_req, 487, SipResponses.reasonOf(487), null);
     respond(resp);
     listener.onDlgCancel(this, msg);
   } else
   // any other request received
   if (msg.isRequest()) {
     TransactionServer ts = new TransactionServer(sip_provider, msg, null);
     // ts.listen();
     ts.respondWith(MessageFactory.createResponse(msg, 405, SipResponses.reasonOf(405), null));
   }
 }