merged in main

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-teltel-20041118-invitesession@4006 ddefafc4-47db-0310-ae44-fa13212b10f2
updated interface docs


git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-teltel-20041118-invitesession@4007 ddefafc4-47db-0310-ae44-fa13212b10f2
added OfferAnswerType back


git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-teltel-20041118-invitesession@4008 ddefafc4-47db-0310-ae44-fa13212b10f2
Info messages are now explicitly accepted and rejected

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-teltel-20041118-invitesession@4009 ddefafc4-47db-0310-ae44-fa13212b10f2