sip register to server in android-ngn-stack

```
when you register to the server use a wrong user information, should get the
`NgnRegistrationEventTypes.REGISTRATION_NOK` event, but actually receive the
`NgnRegistrationEventTypes.UNREGISTRATION_OK` event.

when i check the code in `NgnSipService` class, method `public int
OnDialogEvent(DialogEvent e)` , switch code `case
tinyWRAPConstants.tsip_event_code_dialog_terminated:`, you directed broadcast
event `NgnRegistrationEventTypes.UNREGISTRATION_OK`, and in android-ngn-stack
all code don't have `NgnRegistrationEventTypes.REGISTRATION_NOK` event
broadcast.
```

Original issue reported on code.google.com by `idiottig...@gmail.com` on 8 Feb 2012 at 1:39

Start in the NgnSipService class and inspect public int OnDialogEvent(DialogEvent e), especially the tinyWRAPConstants.tsip_event_code_dialog_terminated switch case. Reproduce registration with incorrect user information and trace the broadcast event. Done means the failure reports NgnRegistrationEventTypes.REGISTRATION_NOK rather than NgnRegistrationEventTypes.UNREGISTRATION_OK.

Written by the indexing model from the issue text.