rfc4488.txt:Orit Levin:microsoft:usa:8:may:2006:UNKNOWN:kwd,seccons,ianacons:draft-ietf-sip-refer-with-norefersub:2006-02-20:2006-01-24:12:0:0:14:26:0:2004-10-17:0::2004-10-17:467:2006-05-19:89