M. Ranganathan Olivier Deruelle Doug Montgomery Testing SIP Call Flows Using XML Protocol Templates. 33-48 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2644&spage=33 2003 conf/pts/2003 TestCom db/conf/pts/testcom2003.html#RanganathanDM03