Android Native SIP未在Android 9（API级别28）上注册

Question

在服务类的onStartCommand上调用了我的below方法，并且对于API级别27及更低版本而言，它可以正常工作。这样就可以成功发起SIP呼叫，而不会出现任何问题。

但是对于API级别28，sipManager无法打开，并且不会调用mSipManager.setRegistrationListener。因此不会调用SIP onRegistering，onRegistrationDone或onRegistrationFailed。找不到警告或错误。 API级别28应该怎么做？

public void initializeLocalProfile() {
    try {
        SipProfile.Builder builder = new SipProfile.Builder(sip_username, "" + sipServerDomain);
        builder.setPort(sipPort);
        builder.setPassword(sip_password);
        mSipProfile = builder.build();

        Intent i = new Intent();
        i.setAction("android.SipDemo.INCOMING_CALL");
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, Intent.FILL_IN_DATA);

        mSipManager = SipManager.newInstance(this);
        mSipManager.open(mSipProfile, pi, null);

        if (mSipManager.isOpened(sip_username + "@" + sipServerDomain)) {
            mSipManager.setRegistrationListener(mSipProfile.getUriString(), new SipRegistrationListener() {
                @Override
                public void onRegistering(String localProfileUri) {
                    Log.d(TAG, "Registering with SIP Server..., localProfileUri2: " + localProfileUri);
                }

                @Override
                public void onRegistrationDone(String localProfileUri, long expiryTime) {
                    Log.d(TAG, "SIP onRegistrationDone, expiryTime: " + expiryTime);
                    ((AeroApplication) getApplication()).setRegisteredSIP(true);
                }

                @Override
                public void onRegistrationFailed(String localProfileUri, int errorCode, String errorMessage) {
                    Log.d(TAG, "SIP Registration failed :" + errorMessage + ", errorCode :" + errorCode);
                }
            });
        } else {
            Toast.makeText(context, "SIP SipManager not opened, try again.", Toast.LENGTH_SHORT).show();
        }
    } catch (ParseException pe) {
        Log.d(TAG, " SIP ParseException : " + pe.getMessage());
    } catch (SipException se) {
        Log.d(TAG, "SIP Exception: " + se.getMessage());
    }
}