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The free Java library for Asterisk PBX integration.
There is a newer version: 3.41.0
package org.asteriskjava.examples.activities;

import org.asteriskjava.manager.AuthenticationFailedException;
import org.asteriskjava.manager.TimeoutException;
import org.asteriskjava.pbx.*;
import org.asteriskjava.pbx.Call.OperandChannel;
import org.asteriskjava.pbx.activities.BlindTransferActivity;
import org.asteriskjava.pbx.activities.DialActivity;
import org.asteriskjava.pbx.internal.core.AsteriskPBX;

import java.io.IOException;

/**
 * dial somebody and then blind transfer the call to a third party.
 *
 * @author bsutton
 */
public class BlindTransfer {

    static public void main(String[] args) throws IOException, AuthenticationFailedException, TimeoutException {
        /**
         * Initialise the PBX Factory. You need to implement your own
         * AsteriskSettings class.
         */
        PBXFactory.init(new ExamplesAsteriskSettings());

        /**
         * Activities utilise an agi entry point in your dial plan. You can
         * create your own entry point in dialplan or have asterisk-java add it
         * automatically
         */
        AsteriskPBX asteriskPbx = (AsteriskPBX) PBXFactory.getActivePBX();
        asteriskPbx.createAgiEntryPoint();

        // We are all configured lets try and do a blind transfer.
        blindTransfer();
    }

    static private void blindTransfer() {
        String dialOptions = "";

        PBX pbx = PBXFactory.getActivePBX();

        // The trunk MUST match the section header (e.g. [default]) that appears
        // in your /etc/asterisk/sip.d file (assuming you are using a SIP
        // trunk).
        // The trunk is used to select which SIP trunk to dial through.
        Trunk trunk = pbx.buildTrunk("default");

        // We are going to dial from extension 100
        EndPoint from = pbx.buildEndPoint(TechType.SIP, "100");
        // The caller ID to show on extension 100.
        CallerID fromCallerID = pbx.buildCallerID("100", "My Phone");

        // The caller ID to display on the called parties phone
        CallerID toCallerID = pbx.buildCallerID("83208100", "Asterisk Java is calling");
        // The party we are going to call.
        EndPoint to = pbx.buildEndPoint(TechType.SIP, trunk, "5551234");

        // Start the dial and return immediately.
        // progress is provided via the ActivityCallback.
        pbx.dial(from, fromCallerID, to, toCallerID, new ActivityCallback() {

            @Override
            public void progress(DialActivity activity, ActivityStatusEnum status, String message) {
                if (status == ActivityStatusEnum.SUCCESS) {
                    System.out.println("Dial all good so lets do a blind transfer");
                    PBX pbx = PBXFactory.getActivePBX();
                    // Call is up
                    Call call = activity.getNewCall();
                    CallerID toCallerID = pbx.buildCallerID("101", "I'm calling you");
                    EndPoint transferTarget = pbx.buildEndPoint(TechType.SIP, "101");
                    pbx.blindTransfer(call, OperandChannel.REMOTE_PARTY, transferTarget, toCallerID, false, 30L,
                            new ActivityCallback() {

                                @Override
                                public void progress(BlindTransferActivity activity, ActivityStatusEnum status,
                                                     String message) {
                                    // if success the blind transfer completed.
                                }
                            }, "");
                }
                if (status == ActivityStatusEnum.FAILURE)
                    System.out.println("Oops something bad happened when we dialed.");
            }
        }, dialOptions);

    }

}