@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}, }