javax.sip
Interfaces 
ClientTransaction
Dialog
ListeningPoint
ServerTransaction
SipListener
SipProvider
SipStack
Transaction
Classes 
DialogState
DialogTerminatedEvent
IOExceptionEvent
RequestEvent
ResponseEvent
SipFactory
Timeout
TimeoutEvent
TransactionState
TransactionTerminatedEvent
Exceptions 
DialogDoesNotExistException
InvalidArgumentException
ObjectInUseException
PeerUnavailableException
ProviderDoesNotExistException
SipException
TransactionAlreadyExistsException
TransactionDoesNotExistException
TransactionUnavailableException
TransportAlreadySupportedException
TransportNotSupportedException