javax.sip.header
Interfaces 
AcceptEncodingHeader
AcceptHeader
AcceptLanguageHeader
AlertInfoHeader
AllowEventsHeader
AllowHeader
AuthenticationInfoHeader
AuthorizationHeader
CallIdHeader
CallInfoHeader
ContactHeader
ContentDispositionHeader
ContentEncodingHeader
ContentLanguageHeader
ContentLengthHeader
ContentTypeHeader
CSeqHeader
DateHeader
Encoding
ErrorInfoHeader
EventHeader
ExpiresHeader
ExtensionHeader
FromHeader
Header
HeaderAddress
HeaderFactory
InReplyToHeader
JoinHeader
MaxForwardsHeader
MediaType
MimeVersionHeader
MinExpiresHeader
MinSEHeader
OptionTag
OrganizationHeader
Parameters
PathHeader
PriorityHeader
ProxyAuthenticateHeader
ProxyAuthorizationHeader
ProxyRequireHeader
RAckHeader
ReasonHeader
RecordRouteHeader
ReferredByHeader
ReferToHeader
ReplacesHeader
ReplyToHeader
RequireHeader
RetryAfterHeader
RouteHeader
RSeqHeader
ServerHeader
SessionExpiresHeader
SIPETagHeader
SIPIfMatchHeader
SubjectHeader
SubscriptionStateHeader
SupportedHeader
TimeStampHeader
ToHeader
UnsupportedHeader
UserAgentHeader
ViaHeader
WarningHeader
WWWAuthenticateHeader
Exceptions 
TooManyHopsException