public interface NoAckReceivedEvent
Dialog
does not receive the expected ACK
in time after sending a 2xx response to an INVITE or re-INVITE.
The Dialog
automatically retransmits the 2xx response for 64*T1
seconds (32s). If no ACK is received in this time then, this event is fired.
The dialog will be in the Confirmed state, but the application SHOULD terminate
the dialog by sending a BYE.