Help in JSNI callback in javascript object

Hi i need some help to do a wrapper to GWT.

in javascript i have the following:

(...)

// create a new SIP stack. Not mandatory as it's possible to reuse the same satck
        oSipStack = new tsip_stack(txtRealm.value, txtPrivateIdentity.value, txtPublicIdentity.value)
oSipStack.on_event_stack = onSipEventStack;
oSipStack.on_event_dialog = onSipEventDialog;

(...)

// Callback function for SIP Stacks
function onSipEventStack(evt) {
    // this is a special event shared by all sessions and there is no "e_stack_type"
    // check the 'sip/stack' code
    tsk_utils_log_info(evt.s_phrase);
    switch (evt.i_code) {
        case tsip_event_code_e.STACK_STARTED:

(...)

// Callback function for all SIP dialogs (INVITE, REGISTER, INFO...)
function onSipEventDialog(evt) {
    // this is special event shared by all sessions and there is no "e_dialog_type"
    // check the 'sip/dialog' code
    tsk_utils_log_info(evt.s_phrase);
    switch (evt.i_code) {
        case tsip_event_code_e.DIALOG_TRANSPORT_ERROR:
        case tsip_event_code_e.DIALOG_GLOBAL_ERROR:
        case tsip_event_code_e.DIALOG_MESSAGE_ERROR:
        case tsip_event_code_e.DIALOG_WEBRTC_ERROR:

So in my GWT-Wrapper using JSNI i make:

public static native JavaScriptObject tsip_stack(String s_realm,
            String s_impi, String s_impu_uri
            ) /*-{
        return new $wnd.tsip_stack(s_realm, s_impi, s_impu_uri);
    }-*/;

How do i make the callback and is association to the javascript object.

This project is to make an wrapper of sipml5 if someone had the wrapper it helps to

Thanks Best Regards

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