@incollection{sw-gcms-08,
  title = {{Group Conference Management with SIP}},
  author = {Thomas C. Schmidt and Matthias W{\"a}hlisch},
  booktitle = {SIP Handbook: Services, Technologies, and Security of Session Initiation Protocol},
  publisher = {CRC Press},
  year = {2008},
  address = {Boca Raton, FL, USA},
  editor = {Syed Ahson and Mohammad Ilyas},
  note = {on invitation},
  pages = {123--158},
  isbn = {9781420066036},
}