question about SimpleCallSetup

Hi, all

I am new to JAIN SIP.
In the SimpleCallSetup example, after the request is constructed and sent by
calling
inviteTid.sendRequest();
The code call dialog = inviteTid.getDialog(); and terminate.
But the dialog need to take some time to be established.
>From the documentation, nether Transaction.sendRequest() nor
Transaction.getDialog() will block until some event happned.
The question is how the sip stack guarantees that the status of dialog is
updated when calling Transaction.getDialog()?

Best Regards,
Ryan

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