Grigorios Plitsis Ralf Keller Joachim Sachs Realization of a push service for Media Points based on SIP. 256-260 2002 conf/mwcn/2002 MWCN http://dx.doi.org/10.1109/MWCN.2002.1045732 db/conf/mwcn/mwcn2002.html#PlitsisKS02