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    <p>We will have to: </p> <ul> <li>start call</li> <li>hold call</li> <li>start new call</li> <li>join conference ...</li> </ul> <p>To start call see api from <a href="https://stackoverflow.com/questions/1453164/blackberry-make-a-call-from-native-address-book">Blackberry - make a call from native address book</a><br> There is no api to hold and join but we can use <a href="https://stackoverflow.com/questions/1533057/blackberry-run-menu-item-from-dialer-phone-app">Blackberry - run menu item from dialer Phone App</a> technique<br> To bring app screen back foreground we can use code from <a href="https://stackoverflow.com/questions/1984524/blackberry-create-an-application-which-will-lock-another-application-event">Blackberry - Create an application which will lock another application event</a></p> <p>Full code: </p> <pre><code>class Scr extends MainScreen implements PhoneListener { private static final String STR_MODULE_NAME = "SOConferenceCall"; EditField mPhoneNumber = new EditField("phone number: ", "12345"); boolean mConnected = false; Vector mPhoneCalls = new Vector(); public Scr() { Phone.addPhoneListener(this); add(mPhoneNumber); } protected void makeMenu(Menu menu, int instance) { super.makeMenu(menu, instance); if (isCalling()) { menu.add(new MenuItem("add to conference", 0, 0) { public void run() { holdActiveCall(); makeCall(mPhoneNumber.getText()); } }); } else { menu.add(new MenuItem("call", 0, 0) { public void run() { makeCall(mPhoneNumber.getText()); } }); } } private void holdActiveCall() { runMenuItem("Hold"); } private void joinCalls() { runMenuItem("Join Conference"); } private void makeCall(String number) { PhoneArguments call = new PhoneArguments(PhoneArguments.ARG_CALL, number); Invoke.invokeApplication(Invoke.APP_TYPE_PHONE, call); } private void runMenuItem(String menuItemText) { Screen screen = Ui.getUiEngine().getActiveScreen(); Menu menu = screen.getMenu(0); for (int i = 0, cnt = menu.getSize(); i &lt; cnt; i++) if (menu.getItem(i).toString().equalsIgnoreCase(menuItemText)) menu.getItem(i).run(); } protected int switchToForeground() { int id = -1; ApplicationManager appMan = ApplicationManager.getApplicationManager(); ApplicationDescriptor appDes[] = appMan.getVisibleApplications(); for (int i = 0; i &lt; appDes.length; i++) { Sreing name = appDes[i].getModuleName(); if (name.equalsIgnoreCase(STR_MODULE_NAME)) { id = appMan.getProcessId(appDes[i]); appMan.requestForeground(id); // give a time to foreground application try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } break; } } return id; } private boolean isCalling() { return mConnected; } public void callAdded(int callId) { switchToForeground(); } public void callAnswered(int callId) { switchToForeground(); } public void callConferenceCallEstablished(int callId) { switchToForeground(); } public void callConnected(int callId) { if (mPhoneCalls.size() == 0) mConnected = true; else joinCalls(); mPhoneCalls.addElement(Phone.getCall(callId)); switchToForeground(); } public void callDirectConnectConnected(int callId) { switchToForeground(); } public void callDirectConnectDisconnected(int callId) { switchToForeground(); } public void callDisconnected(int callId) { mPhoneCalls.removeElement(Phone.getCall(callId)); if (mPhoneCalls.size() == 0) mConnected = false; switchToForeground(); } public void callEndedByUser(int callId) { switchToForeground(); } public void callFailed(int callId, int reason) { switchToForeground(); } public void callHeld(int callId) { switchToForeground(); } public void callIncoming(int callId) { switchToForeground(); } public void callInitiated(int callid) { switchToForeground(); } public void callRemoved(int callId) { switchToForeground(); } public void callResumed(int callId) { switchToForeground(); } public void callWaiting(int callid) { switchToForeground(); } public void conferenceCallDisconnected(int callId) { switchToForeground(); } } </code></pre>
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