org.mitre.jsip
Classes 
GeneralUri
HeaderParser
MessageSocket
MessageSocketFactory
MessageThread
MimeContentType
MulticastMessageSocket
SdpMessage
Sip
SipCall
SipCallMember
SipClient
SipHeader
SipMessage
SipRegister
SipRequestMessage
SipResponseMessage
SipStatus
SipTester
SipTransaction
SipUri
SipUriList
SipUser
SipUtil
SipVia
SipViaList
TCPMessageSocket
UDPMessageSocket
Exceptions 
BadHeaderException
RegisterException