rfc5057.txt:Robert Sparks:estacado:usa:25:nov:2007:UNKNOWN:figure,seccons:draft-ietf-sipping-dialogusage:2007-09-11:2006-11-25:176:0:95:20:291:1:2004-7-2:511:draft-sparks-sipping-dialogusage:2005-11-28:362:2007-11-07:56