@incollection{sw-gcms-08,
  author = {Thomas C. Schmidt and Matthias W{\"a}hlisch},
  title = {{Group Conference Management with SIP}},
  booktitle = {SIP Handbook: Services, Technologies, and Security},
  editor = {Syed Ahson and Mohammad Ilyas},
  year = {2008},
  month = {December},
  pages = {123--158},
  address = {Boca Raton, FL, USA},
  publisher = {CRC Press},
  url = {http://www.crcpress.com/product/isbn/9781420066036},
  isbn = {9781420066036},
  note = {on invitation},
  theme = {mmcast|vcoip|p2p}
}